perf_counter tools: separate kerneltop into 'perf top' and 'perf stat'

Lets use the Git framework of built-in commands.

Signed-off-by: Ingo Molnar <mingo@elte.hu>

Documentation/perf_counter/Makefile

@@ -309,6 +309,7 @@ LIB_OBJS += usage.o
 LIB_OBJS += wrapper.o
 
 BUILTIN_OBJS += builtin-help.o
+BUILTIN_OBJS += builtin-stat.o
 BUILTIN_OBJS += builtin-top.o
 
 PERFLIBS = $(LIB_FILE)

Documentation/perf_counter/builtin-stat.c

@@ -0,0 +1,592 @@
+/*
+ * kerneltop.c: show top kernel functions - performance counters showcase
+
+   Build with:
+
+     cc -O6 -Wall -c -o kerneltop.o kerneltop.c -lrt
+
+   Sample output:
+
+------------------------------------------------------------------------------
+ KernelTop:    2669 irqs/sec  [NMI, cache-misses/cache-refs],  (all, cpu: 2)
+------------------------------------------------------------------------------
+
+             weight         RIP          kernel function
+             ______   ________________   _______________
+
+              35.20 - ffffffff804ce74b : skb_copy_and_csum_dev
+              33.00 - ffffffff804cb740 : sock_alloc_send_skb
+              31.26 - ffffffff804ce808 : skb_push
+              22.43 - ffffffff80510004 : tcp_established_options
+              19.00 - ffffffff8027d250 : find_get_page
+              15.76 - ffffffff804e4fc9 : eth_type_trans
+              15.20 - ffffffff804d8baa : dst_release
+              14.86 - ffffffff804cf5d8 : skb_release_head_state
+              14.00 - ffffffff802217d5 : read_hpet
+              12.00 - ffffffff804ffb7f : __ip_local_out
+              11.97 - ffffffff804fc0c8 : ip_local_deliver_finish
+               8.54 - ffffffff805001a3 : ip_queue_xmit
+ */
+
+/*
+ * perfstat:  /usr/bin/time -alike performance counter statistics utility
+
+          It summarizes the counter events of all tasks (and child tasks),
+          covering all CPUs that the command (or workload) executes on.
+          It only counts the per-task events of the workload started,
+          independent of how many other tasks run on those CPUs.
+
+   Sample output:
+
+   $ ./perfstat -e 1 -e 3 -e 5 ls -lR /usr/include/ >/dev/null
+
+   Performance counter stats for 'ls':
+
+           163516953 instructions
+                2295 cache-misses
+             2855182 branch-misses
+ */
+
+ /*
+  * Copyright (C) 2008, Red Hat Inc, Ingo Molnar <mingo@redhat.com>
+  *
+  * Improvements and fixes by:
+  *
+  *   Arjan van de Ven <arjan@linux.intel.com>
+  *   Yanmin Zhang <yanmin.zhang@intel.com>
+  *   Wu Fengguang <fengguang.wu@intel.com>
+  *   Mike Galbraith <efault@gmx.de>
+  *   Paul Mackerras <paulus@samba.org>
+  *
+  * Released under the GPL v2. (and only v2, not any later version)
+  */
+
+#include "util.h"
+
+#include <getopt.h>
+#include <assert.h>
+#include <fcntl.h>
+#include <stdio.h>
+#include <errno.h>
+#include <ctype.h>
+#include <time.h>
+#include <sched.h>
+#include <pthread.h>
+
+#include <sys/syscall.h>
+#include <sys/ioctl.h>
+#include <sys/poll.h>
+#include <sys/prctl.h>
+#include <sys/wait.h>
+#include <sys/uio.h>
+#include <sys/mman.h>
+
+#include <linux/unistd.h>
+#include <linux/types.h>
+
+#include "../../include/linux/perf_counter.h"
+
+
+/*
+ * prctl(PR_TASK_PERF_COUNTERS_DISABLE) will (cheaply) disable all
+ * counters in the current task.
+ */
+#define PR_TASK_PERF_COUNTERS_DISABLE   31
+#define PR_TASK_PERF_COUNTERS_ENABLE    32
+
+#define rdclock()                                       \
+({                                                      \
+        struct timespec ts;                             \
+                                                        \
+        clock_gettime(CLOCK_MONOTONIC, &ts);            \
+        ts.tv_sec * 1000000000ULL + ts.tv_nsec;         \
+})
+
+/*
+ * Pick up some kernel type conventions:
+ */
+#define __user
+#define asmlinkage
+
+#ifdef __x86_64__
+#define __NR_perf_counter_open 295
+#define rmb()		asm volatile("lfence" ::: "memory")
+#define cpu_relax()	asm volatile("rep; nop" ::: "memory");
+#endif
+
+#ifdef __i386__
+#define __NR_perf_counter_open 333
+#define rmb()		asm volatile("lfence" ::: "memory")
+#define cpu_relax()	asm volatile("rep; nop" ::: "memory");
+#endif
+
+#ifdef __powerpc__
+#define __NR_perf_counter_open 319
+#define rmb() 		asm volatile ("sync" ::: "memory")
+#define cpu_relax()	asm volatile ("" ::: "memory");
+#endif
+
+#define unlikely(x)	__builtin_expect(!!(x), 0)
+#define min(x, y) ({				\
+	typeof(x) _min1 = (x);			\
+	typeof(y) _min2 = (y);			\
+	(void) (&_min1 == &_min2);		\
+	_min1 < _min2 ? _min1 : _min2; })
+
+extern asmlinkage int sys_perf_counter_open(
+        struct perf_counter_hw_event    *hw_event_uptr          __user,
+        pid_t                           pid,
+        int                             cpu,
+        int                             group_fd,
+        unsigned long                   flags);
+
+#define MAX_COUNTERS			64
+#define MAX_NR_CPUS			256
+
+#define EID(type, id) (((__u64)(type) << PERF_COUNTER_TYPE_SHIFT) | (id))
+
+static int			system_wide			=  0;
+
+static int			nr_counters			=  0;
+static __u64			event_id[MAX_COUNTERS]		= {
+	EID(PERF_TYPE_SOFTWARE, PERF_COUNT_TASK_CLOCK),
+	EID(PERF_TYPE_SOFTWARE, PERF_COUNT_CONTEXT_SWITCHES),
+	EID(PERF_TYPE_SOFTWARE, PERF_COUNT_CPU_MIGRATIONS),
+	EID(PERF_TYPE_SOFTWARE, PERF_COUNT_PAGE_FAULTS),
+
+	EID(PERF_TYPE_HARDWARE, PERF_COUNT_CPU_CYCLES),
+	EID(PERF_TYPE_HARDWARE, PERF_COUNT_INSTRUCTIONS),
+	EID(PERF_TYPE_HARDWARE, PERF_COUNT_CACHE_REFERENCES),
+	EID(PERF_TYPE_HARDWARE, PERF_COUNT_CACHE_MISSES),
+};
+static int			default_interval = 100000;
+static int			event_count[MAX_COUNTERS];
+static int			fd[MAX_NR_CPUS][MAX_COUNTERS];
+
+static int			tid				= -1;
+static int			profile_cpu			= -1;
+static int			nr_cpus				=  0;
+static int			nmi				=  1;
+static int			group				=  0;
+static unsigned int		page_size;
+
+static int			zero;
+
+static int			scale;
+
+static const unsigned int default_count[] = {
+	1000000,
+	1000000,
+	  10000,
+	  10000,
+	1000000,
+	  10000,
+};
+
+static char *hw_event_names[] = {
+	"CPU cycles",
+	"instructions",
+	"cache references",
+	"cache misses",
+	"branches",
+	"branch misses",
+	"bus cycles",
+};
+
+static char *sw_event_names[] = {
+	"cpu clock ticks",
+	"task clock ticks",
+	"pagefaults",
+	"context switches",
+	"CPU migrations",
+	"minor faults",
+	"major faults",
+};
+
+struct event_symbol {
+	__u64 event;
+	char *symbol;
+};
+
+static struct event_symbol event_symbols[] = {
+	{EID(PERF_TYPE_HARDWARE, PERF_COUNT_CPU_CYCLES),		"cpu-cycles",		},
+	{EID(PERF_TYPE_HARDWARE, PERF_COUNT_CPU_CYCLES),		"cycles",		},
+	{EID(PERF_TYPE_HARDWARE, PERF_COUNT_INSTRUCTIONS),		"instructions",		},
+	{EID(PERF_TYPE_HARDWARE, PERF_COUNT_CACHE_REFERENCES),		"cache-references",	},
+	{EID(PERF_TYPE_HARDWARE, PERF_COUNT_CACHE_MISSES),		"cache-misses",		},
+	{EID(PERF_TYPE_HARDWARE, PERF_COUNT_BRANCH_INSTRUCTIONS),	"branch-instructions",	},
+	{EID(PERF_TYPE_HARDWARE, PERF_COUNT_BRANCH_INSTRUCTIONS),	"branches",		},
+	{EID(PERF_TYPE_HARDWARE, PERF_COUNT_BRANCH_MISSES),		"branch-misses",	},
+	{EID(PERF_TYPE_HARDWARE, PERF_COUNT_BUS_CYCLES),		"bus-cycles",		},
+
+	{EID(PERF_TYPE_SOFTWARE, PERF_COUNT_CPU_CLOCK),			"cpu-clock",		},
+	{EID(PERF_TYPE_SOFTWARE, PERF_COUNT_TASK_CLOCK),		"task-clock",		},
+	{EID(PERF_TYPE_SOFTWARE, PERF_COUNT_PAGE_FAULTS),		"page-faults",		},
+	{EID(PERF_TYPE_SOFTWARE, PERF_COUNT_PAGE_FAULTS),		"faults",		},
+	{EID(PERF_TYPE_SOFTWARE, PERF_COUNT_PAGE_FAULTS_MIN),		"minor-faults",		},
+	{EID(PERF_TYPE_SOFTWARE, PERF_COUNT_PAGE_FAULTS_MAJ),		"major-faults",		},
+	{EID(PERF_TYPE_SOFTWARE, PERF_COUNT_CONTEXT_SWITCHES),		"context-switches",	},
+	{EID(PERF_TYPE_SOFTWARE, PERF_COUNT_CONTEXT_SWITCHES),		"cs",			},
+	{EID(PERF_TYPE_SOFTWARE, PERF_COUNT_CPU_MIGRATIONS),		"cpu-migrations",	},
+	{EID(PERF_TYPE_SOFTWARE, PERF_COUNT_CPU_MIGRATIONS),		"migrations",		},
+};
+
+#define __PERF_COUNTER_FIELD(config, name) \
+	((config & PERF_COUNTER_##name##_MASK) >> PERF_COUNTER_##name##_SHIFT)
+
+#define PERF_COUNTER_RAW(config)	__PERF_COUNTER_FIELD(config, RAW)
+#define PERF_COUNTER_CONFIG(config)	__PERF_COUNTER_FIELD(config, CONFIG)
+#define PERF_COUNTER_TYPE(config)	__PERF_COUNTER_FIELD(config, TYPE)
+#define PERF_COUNTER_ID(config)		__PERF_COUNTER_FIELD(config, EVENT)
+
+static void display_events_help(void)
+{
+	unsigned int i;
+	__u64 e;
+
+	printf(
+	" -e EVENT     --event=EVENT   #  symbolic-name        abbreviations");
+
+	for (i = 0; i < ARRAY_SIZE(event_symbols); i++) {
+		int type, id;
+
+		e = event_symbols[i].event;
+		type = PERF_COUNTER_TYPE(e);
+		id = PERF_COUNTER_ID(e);
+
+		printf("\n                             %d:%d: %-20s",
+				type, id, event_symbols[i].symbol);
+	}
+
+	printf("\n"
+	"                           rNNN: raw PMU events (eventsel+umask)\n\n");
+}
+
+static void display_help(void)
+{
+	printf(
+	"Usage: perfstat [<events...>] <cmd...>\n\n"
+	"PerfStat Options (up to %d event types can be specified):\n\n",
+		 MAX_COUNTERS);
+
+	display_events_help();
+
+	printf(
+	" -l                           # scale counter values\n"
+	" -a                           # system-wide collection\n");
+	exit(0);
+}
+
+static char *event_name(int ctr)
+{
+	__u64 config = event_id[ctr];
+	int type = PERF_COUNTER_TYPE(config);
+	int id = PERF_COUNTER_ID(config);
+	static char buf[32];
+
+	if (PERF_COUNTER_RAW(config)) {
+		sprintf(buf, "raw 0x%llx", PERF_COUNTER_CONFIG(config));
+		return buf;
+	}
+
+	switch (type) {
+	case PERF_TYPE_HARDWARE:
+		if (id < PERF_HW_EVENTS_MAX)
+			return hw_event_names[id];
+		return "unknown-hardware";
+
+	case PERF_TYPE_SOFTWARE:
+		if (id < PERF_SW_EVENTS_MAX)
+			return sw_event_names[id];
+		return "unknown-software";
+
+	default:
+		break;
+	}
+
+	return "unknown";
+}
+
+/*
+ * Each event can have multiple symbolic names.
+ * Symbolic names are (almost) exactly matched.
+ */
+static __u64 match_event_symbols(char *str)
+{
+	__u64 config, id;
+	int type;
+	unsigned int i;
+
+	if (sscanf(str, "r%llx", &config) == 1)
+		return config | PERF_COUNTER_RAW_MASK;
+
+	if (sscanf(str, "%d:%llu", &type, &id) == 2)
+		return EID(type, id);
+
+	for (i = 0; i < ARRAY_SIZE(event_symbols); i++) {
+		if (!strncmp(str, event_symbols[i].symbol,
+			     strlen(event_symbols[i].symbol)))
+			return event_symbols[i].event;
+	}
+
+	return ~0ULL;
+}
+
+static int parse_events(char *str)
+{
+	__u64 config;
+
+again:
+	if (nr_counters == MAX_COUNTERS)
+		return -1;
+
+	config = match_event_symbols(str);
+	if (config == ~0ULL)
+		return -1;
+
+	event_id[nr_counters] = config;
+	nr_counters++;
+
+	str = strstr(str, ",");
+	if (str) {
+		str++;
+		goto again;
+	}
+
+	return 0;
+}
+
+
+/*
+ * perfstat
+ */
+
+char fault_here[1000000];
+
+static void create_perfstat_counter(int counter)
+{
+	struct perf_counter_hw_event hw_event;
+
+	memset(&hw_event, 0, sizeof(hw_event));
+	hw_event.config		= event_id[counter];
+	hw_event.record_type	= 0;
+	hw_event.nmi		= 0;
+	if (scale)
+		hw_event.read_format	= PERF_FORMAT_TOTAL_TIME_ENABLED |
+					  PERF_FORMAT_TOTAL_TIME_RUNNING;
+
+	if (system_wide) {
+		int cpu;
+		for (cpu = 0; cpu < nr_cpus; cpu ++) {
+			fd[cpu][counter] = sys_perf_counter_open(&hw_event, -1, cpu, -1, 0);
+			if (fd[cpu][counter] < 0) {
+				printf("perfstat error: syscall returned with %d (%s)\n",
+						fd[cpu][counter], strerror(errno));
+				exit(-1);
+			}
+		}
+	} else {
+		hw_event.inherit	= 1;
+		hw_event.disabled	= 1;
+
+		fd[0][counter] = sys_perf_counter_open(&hw_event, 0, -1, -1, 0);
+		if (fd[0][counter] < 0) {
+			printf("perfstat error: syscall returned with %d (%s)\n",
+					fd[0][counter], strerror(errno));
+			exit(-1);
+		}
+	}
+}
+
+int do_perfstat(int argc, char *argv[])
+{
+	unsigned long long t0, t1;
+	int counter;
+	ssize_t res;
+	int status;
+	int pid;
+
+	if (!system_wide)
+		nr_cpus = 1;
+
+	for (counter = 0; counter < nr_counters; counter++)
+		create_perfstat_counter(counter);
+
+	argc -= optind;
+	argv += optind;
+
+	if (!argc)
+		display_help();
+
+	/*
+	 * Enable counters and exec the command:
+	 */
+	t0 = rdclock();
+	prctl(PR_TASK_PERF_COUNTERS_ENABLE);
+
+	if ((pid = fork()) < 0)
+		perror("failed to fork");
+	if (!pid) {
+		if (execvp(argv[0], argv)) {
+			perror(argv[0]);
+			exit(-1);
+		}
+	}
+	while (wait(&status) >= 0)
+		;
+	prctl(PR_TASK_PERF_COUNTERS_DISABLE);
+	t1 = rdclock();
+
+	fflush(stdout);
+
+	fprintf(stderr, "\n");
+	fprintf(stderr, " Performance counter stats for \'%s\':\n",
+		argv[0]);
+	fprintf(stderr, "\n");
+
+	for (counter = 0; counter < nr_counters; counter++) {
+		int cpu, nv;
+		__u64 count[3], single_count[3];
+		int scaled;
+
+		count[0] = count[1] = count[2] = 0;
+		nv = scale ? 3 : 1;
+		for (cpu = 0; cpu < nr_cpus; cpu ++) {
+			res = read(fd[cpu][counter],
+				   single_count, nv * sizeof(__u64));
+			assert(res == nv * sizeof(__u64));
+
+			count[0] += single_count[0];
+			if (scale) {
+				count[1] += single_count[1];
+				count[2] += single_count[2];
+			}
+		}
+
+		scaled = 0;
+		if (scale) {
+			if (count[2] == 0) {
+				fprintf(stderr, " %14s  %-20s\n",
+					"<not counted>", event_name(counter));
+				continue;
+			}
+			if (count[2] < count[1]) {
+				scaled = 1;
+				count[0] = (unsigned long long)
+					((double)count[0] * count[1] / count[2] + 0.5);
+			}
+		}
+
+		if (event_id[counter] == EID(PERF_TYPE_SOFTWARE, PERF_COUNT_CPU_CLOCK) ||
+		    event_id[counter] == EID(PERF_TYPE_SOFTWARE, PERF_COUNT_TASK_CLOCK)) {
+
+			double msecs = (double)count[0] / 1000000;
+
+			fprintf(stderr, " %14.6f  %-20s (msecs)",
+				msecs, event_name(counter));
+		} else {
+			fprintf(stderr, " %14Ld  %-20s (events)",
+				count[0], event_name(counter));
+		}
+		if (scaled)
+			fprintf(stderr, "  (scaled from %.2f%%)",
+				(double) count[2] / count[1] * 100);
+		fprintf(stderr, "\n");
+	}
+	fprintf(stderr, "\n");
+	fprintf(stderr, " Wall-clock time elapsed: %12.6f msecs\n",
+			(double)(t1-t0)/1e6);
+	fprintf(stderr, "\n");
+
+	return 0;
+}
+
+static void process_options(int argc, char **argv)
+{
+	int error = 0, counter;
+
+	for (;;) {
+		int option_index = 0;
+		/** Options for getopt */
+		static struct option long_options[] = {
+			{"count",	required_argument,	NULL, 'c'},
+			{"cpu",		required_argument,	NULL, 'C'},
+			{"delay",	required_argument,	NULL, 'd'},
+			{"dump_symtab",	no_argument,		NULL, 'D'},
+			{"event",	required_argument,	NULL, 'e'},
+			{"filter",	required_argument,	NULL, 'f'},
+			{"group",	required_argument,	NULL, 'g'},
+			{"help",	no_argument,		NULL, 'h'},
+			{"nmi",		required_argument,	NULL, 'n'},
+			{"munmap_info",	no_argument,		NULL, 'U'},
+			{"pid",		required_argument,	NULL, 'p'},
+			{"realtime",	required_argument,	NULL, 'r'},
+			{"scale",	no_argument,		NULL, 'l'},
+			{"symbol",	required_argument,	NULL, 's'},
+			{"stat",	no_argument,		NULL, 'S'},
+			{"vmlinux",	required_argument,	NULL, 'x'},
+			{"zero",	no_argument,		NULL, 'z'},
+			{NULL,		0,			NULL,  0 }
+		};
+		int c = getopt_long(argc, argv, "+:ac:C:d:De:f:g:hln:m:p:r:s:Sx:zMU",
+				    long_options, &option_index);
+		if (c == -1)
+			break;
+
+		switch (c) {
+		case 'a': system_wide			=	       1; break;
+		case 'c': default_interval		=   atoi(optarg); break;
+		case 'C':
+			/* CPU and PID are mutually exclusive */
+			if (tid != -1) {
+				printf("WARNING: CPU switch overriding PID\n");
+				sleep(1);
+				tid = -1;
+			}
+			profile_cpu			=   atoi(optarg); break;
+
+		case 'e': error				= parse_events(optarg); break;
+
+		case 'g': group				=   atoi(optarg); break;
+		case 'h':      				  display_help(); break;
+		case 'l': scale				=	       1; break;
+		case 'n': nmi				=   atoi(optarg); break;
+		case 'p':
+			/* CPU and PID are mutually exclusive */
+			if (profile_cpu != -1) {
+				printf("WARNING: PID switch overriding CPU\n");
+				sleep(1);
+				profile_cpu = -1;
+			}
+			tid				=   atoi(optarg); break;
+		case 'z': zero				=              1; break;
+		default: error = 1; break;
+		}
+	}
+	if (error)
+		display_help();
+
+	if (!nr_counters) {
+		nr_counters = 8;
+	}
+
+	for (counter = 0; counter < nr_counters; counter++) {
+		if (event_count[counter])
+			continue;
+
+		event_count[counter] = default_interval;
+	}
+}
+
+int cmd_stat(int argc, char **argv, const char *prefix)
+{
+	page_size = sysconf(_SC_PAGE_SIZE);
+
+	process_options(argc, argv);
+
+	nr_cpus = sysconf(_SC_NPROCESSORS_ONLN);
+	assert(nr_cpus <= MAX_NR_CPUS);
+	assert(nr_cpus >= 0);
+
+	return do_perfstat(argc, argv);
+}

Documentation/perf_counter/builtin-top.c

@@ -28,25 +28,6 @@
                8.54 - ffffffff805001a3 : ip_queue_xmit
  */
 
-/*
- * perfstat:  /usr/bin/time -alike performance counter statistics utility
-
-          It summarizes the counter events of all tasks (and child tasks),
-          covering all CPUs that the command (or workload) executes on.
-          It only counts the per-task events of the workload started,
-          independent of how many other tasks run on those CPUs.
-
-   Sample output:
-
-   $ ./perfstat -e 1 -e 3 -e 5 ls -lR /usr/include/ >/dev/null
-
-   Performance counter stats for 'ls':
-
-           163516953 instructions
-                2295 cache-misses
-             2855182 branch-misses
- */
-
  /*
   * Copyright (C) 2008, Red Hat Inc, Ingo Molnar <mingo@redhat.com>
   *
@@ -149,7 +130,6 @@ asmlinkage int sys_perf_counter_open(
 
 #define EID(type, id) (((__u64)(type) << PERF_COUNTER_TYPE_SHIFT) | (id))
 
-static int			run_perfstat			=  0;
 static int			system_wide			=  0;
 
 static int			nr_counters			=  0;
@@ -203,7 +183,7 @@ struct source_line {
 static struct source_line	*lines;
 static struct source_line	**lines_tail;
 
-const unsigned int default_count[] = {
+static const unsigned int default_count[] = {
 	1000000,
 	1000000,
 	  10000,
@@ -291,26 +271,8 @@ static void display_events_help(void)
 	"                           rNNN: raw PMU events (eventsel+umask)\n\n");
 }
 
-static void display_perfstat_help(void)
-{
-	printf(
-	"Usage: perfstat [<events...>] <cmd...>\n\n"
-	"PerfStat Options (up to %d event types can be specified):\n\n",
-		 MAX_COUNTERS);
-
-	display_events_help();
-
-	printf(
-	" -l                           # scale counter values\n"
-	" -a                           # system-wide collection\n");
-	exit(0);
-}
-
 static void display_help(void)
 {
-	if (run_perfstat)
-		return display_perfstat_help();
-
 	printf(
 	"Usage: kerneltop [<options>]\n"
 	"   Or: kerneltop -S [<options>] COMMAND [ARGS]\n\n"
@@ -320,8 +282,6 @@ static void display_help(void)
 	display_events_help();
 
 	printf(
-	" -S        --stat             # perfstat COMMAND\n"
-	" -a                           # system-wide collection (for perfstat)\n\n"
 	" -c CNT    --count=CNT        # event period to sample\n\n"
 	" -C CPU    --cpu=CPU          # CPU (-1 for all)                 [default: -1]\n"
 	" -p PID    --pid=PID          # PID of sampled task (-1 for all) [default: -1]\n\n"
@@ -420,151 +380,6 @@ again:
 	return 0;
 }
 
-
-/*
- * perfstat
- */
-
-char fault_here[1000000];
-
-static void create_perfstat_counter(int counter)
-{
-	struct perf_counter_hw_event hw_event;
-
-	memset(&hw_event, 0, sizeof(hw_event));
-	hw_event.config		= event_id[counter];
-	hw_event.record_type	= 0;
-	hw_event.nmi		= 0;
-	if (scale)
-		hw_event.read_format	= PERF_FORMAT_TOTAL_TIME_ENABLED |
-					  PERF_FORMAT_TOTAL_TIME_RUNNING;
-
-	if (system_wide) {
-		int cpu;
-		for (cpu = 0; cpu < nr_cpus; cpu ++) {
-			fd[cpu][counter] = sys_perf_counter_open(&hw_event, -1, cpu, -1, 0);
-			if (fd[cpu][counter] < 0) {
-				printf("perfstat error: syscall returned with %d (%s)\n",
-						fd[cpu][counter], strerror(errno));
-				exit(-1);
-			}
-		}
-	} else {
-		hw_event.inherit	= 1;
-		hw_event.disabled	= 1;
-
-		fd[0][counter] = sys_perf_counter_open(&hw_event, 0, -1, -1, 0);
-		if (fd[0][counter] < 0) {
-			printf("perfstat error: syscall returned with %d (%s)\n",
-					fd[0][counter], strerror(errno));
-			exit(-1);
-		}
-	}
-}
-
-int do_perfstat(int argc, char *argv[])
-{
-	unsigned long long t0, t1;
-	int counter;
-	ssize_t res;
-	int status;
-	int pid;
-
-	if (!system_wide)
-		nr_cpus = 1;
-
-	for (counter = 0; counter < nr_counters; counter++)
-		create_perfstat_counter(counter);
-
-	argc -= optind;
-	argv += optind;
-
-	if (!argc)
-		display_help();
-
-	/*
-	 * Enable counters and exec the command:
-	 */
-	t0 = rdclock();
-	prctl(PR_TASK_PERF_COUNTERS_ENABLE);
-
-	if ((pid = fork()) < 0)
-		perror("failed to fork");
-	if (!pid) {
-		if (execvp(argv[0], argv)) {
-			perror(argv[0]);
-			exit(-1);
-		}
-	}
-	while (wait(&status) >= 0)
-		;
-	prctl(PR_TASK_PERF_COUNTERS_DISABLE);
-	t1 = rdclock();
-
-	fflush(stdout);
-
-	fprintf(stderr, "\n");
-	fprintf(stderr, " Performance counter stats for \'%s\':\n",
-		argv[0]);
-	fprintf(stderr, "\n");
-
-	for (counter = 0; counter < nr_counters; counter++) {
-		int cpu, nv;
-		__u64 count[3], single_count[3];
-		int scaled;
-
-		count[0] = count[1] = count[2] = 0;
-		nv = scale ? 3 : 1;
-		for (cpu = 0; cpu < nr_cpus; cpu ++) {
-			res = read(fd[cpu][counter],
-				   single_count, nv * sizeof(__u64));
-			assert(res == nv * sizeof(__u64));
-
-			count[0] += single_count[0];
-			if (scale) {
-				count[1] += single_count[1];
-				count[2] += single_count[2];
-			}
-		}
-
-		scaled = 0;
-		if (scale) {
-			if (count[2] == 0) {
-				fprintf(stderr, " %14s  %-20s\n",
-					"<not counted>", event_name(counter));
-				continue;
-			}
-			if (count[2] < count[1]) {
-				scaled = 1;
-				count[0] = (unsigned long long)
-					((double)count[0] * count[1] / count[2] + 0.5);
-			}
-		}
-
-		if (event_id[counter] == EID(PERF_TYPE_SOFTWARE, PERF_COUNT_CPU_CLOCK) ||
-		    event_id[counter] == EID(PERF_TYPE_SOFTWARE, PERF_COUNT_TASK_CLOCK)) {
-
-			double msecs = (double)count[0] / 1000000;
-
-			fprintf(stderr, " %14.6f  %-20s (msecs)",
-				msecs, event_name(counter));
-		} else {
-			fprintf(stderr, " %14Ld  %-20s (events)",
-				count[0], event_name(counter));
-		}
-		if (scaled)
-			fprintf(stderr, "  (scaled from %.2f%%)",
-				(double) count[2] / count[1] * 100);
-		fprintf(stderr, "\n");
-	}
-	fprintf(stderr, "\n");
-	fprintf(stderr, " Wall-clock time elapsed: %12.6f msecs\n",
-			(double)(t1-t0)/1e6);
-	fprintf(stderr, "\n");
-
-	return 0;
-}
-
 /*
  * Symbols
  */
@@ -805,7 +620,7 @@ static int read_symbol(FILE *in, struct sym_entry *s)
 	return 0;
 }
 
-int compare_addr(const void *__sym1, const void *__sym2)
+static int compare_addr(const void *__sym1, const void *__sym2)
 {
 	const struct sym_entry *sym1 = __sym1, *sym2 = __sym2;
 
@@ -1070,9 +885,6 @@ static void process_options(int argc, char **argv)
 {
 	int error = 0, counter;
 
-	if (strstr(argv[0], "perfstat"))
-		run_perfstat = 1;
-
 	for (;;) {
 		int option_index = 0;
 		/** Options for getopt */
@@ -1134,7 +946,6 @@ static void process_options(int argc, char **argv)
 			tid				=   atoi(optarg); break;
 		case 'r': realtime_prio			=   atoi(optarg); break;
 		case 's': sym_filter			= strdup(optarg); break;
-		case 'S': run_perfstat			=	       1; break;
 		case 'x': vmlinux			= strdup(optarg); break;
 		case 'z': zero				=              1; break;
 		case 'm': mmap_pages			=   atoi(optarg); break;
@@ -1147,12 +958,8 @@ static void process_options(int argc, char **argv)
 		display_help();
 
 	if (!nr_counters) {
-		if (run_perfstat)
-			nr_counters = 8;
-		else {
-			nr_counters = 1;
-			event_id[0] = 0;
-		}
+		nr_counters = 1;
+		event_id[0] = 0;
 	}
 
 	for (counter = 0; counter < nr_counters; counter++) {
@@ -1308,9 +1115,6 @@ int cmd_top(int argc, char **argv, const char *prefix)
 	assert(nr_cpus <= MAX_NR_CPUS);
 	assert(nr_cpus >= 0);
 
-	if (run_perfstat)
-		return do_perfstat(argc, argv);
-
 	if (tid != -1 || profile_cpu != -1)
 		nr_cpus = 1;
 

Documentation/perf_counter/builtin.h

@@ -14,5 +14,6 @@ extern void prune_packed_objects(int);
 extern int read_line_with_nul(char *buf, int size, FILE *file);
 extern int check_pager_config(const char *cmd);
 
-extern int cmd_top(int argc, const char **argv, const char *prefix);
+extern int cmd_top(int argc, char **argv, const char *prefix);
+extern int cmd_stat(int argc, char **argv, const char *prefix);
 #endif

Documentation/perf_counter/command-list.txt

@@ -1,4 +1,5 @@
 # List of known perf commands.
 # command name				category [deprecated] [common]
 perf-top                                mainporcelain common
+perf-stat                               mainporcelain common
 

Documentation/perf_counter/kerneltop.c

@@ -1,1409 +0,0 @@
-/*
- * kerneltop.c: show top kernel functions - performance counters showcase
-
-   Build with:
-
-     cc -O6 -Wall -c -o kerneltop.o kerneltop.c -lrt
-
-   Sample output:
-
-------------------------------------------------------------------------------
- KernelTop:    2669 irqs/sec  [NMI, cache-misses/cache-refs],  (all, cpu: 2)
-------------------------------------------------------------------------------
-
-             weight         RIP          kernel function
-             ______   ________________   _______________
-
-              35.20 - ffffffff804ce74b : skb_copy_and_csum_dev
-              33.00 - ffffffff804cb740 : sock_alloc_send_skb
-              31.26 - ffffffff804ce808 : skb_push
-              22.43 - ffffffff80510004 : tcp_established_options
-              19.00 - ffffffff8027d250 : find_get_page
-              15.76 - ffffffff804e4fc9 : eth_type_trans
-              15.20 - ffffffff804d8baa : dst_release
-              14.86 - ffffffff804cf5d8 : skb_release_head_state
-              14.00 - ffffffff802217d5 : read_hpet
-              12.00 - ffffffff804ffb7f : __ip_local_out
-              11.97 - ffffffff804fc0c8 : ip_local_deliver_finish
-               8.54 - ffffffff805001a3 : ip_queue_xmit
- */
-
-/*
- * perfstat:  /usr/bin/time -alike performance counter statistics utility
-
-          It summarizes the counter events of all tasks (and child tasks),
-          covering all CPUs that the command (or workload) executes on.
-          It only counts the per-task events of the workload started,
-          independent of how many other tasks run on those CPUs.
-
-   Sample output:
-
-   $ ./perfstat -e 1 -e 3 -e 5 ls -lR /usr/include/ >/dev/null
-
-   Performance counter stats for 'ls':
-
-           163516953 instructions
-                2295 cache-misses
-             2855182 branch-misses
- */
-
- /*
-  * Copyright (C) 2008, Red Hat Inc, Ingo Molnar <mingo@redhat.com>
-  *
-  * Improvements and fixes by:
-  *
-  *   Arjan van de Ven <arjan@linux.intel.com>
-  *   Yanmin Zhang <yanmin.zhang@intel.com>
-  *   Wu Fengguang <fengguang.wu@intel.com>
-  *   Mike Galbraith <efault@gmx.de>
-  *   Paul Mackerras <paulus@samba.org>
-  *
-  * Released under the GPL v2. (and only v2, not any later version)
-  */
-
-#define _GNU_SOURCE
-#include <sys/types.h>
-#include <sys/stat.h>
-#include <sys/time.h>
-#include <unistd.h>
-#include <stdint.h>
-#include <stdlib.h>
-#include <string.h>
-#include <limits.h>
-#include <getopt.h>
-#include <assert.h>
-#include <fcntl.h>
-#include <stdio.h>
-#include <errno.h>
-#include <ctype.h>
-#include <time.h>
-#include <sched.h>
-#include <pthread.h>
-
-#include <sys/syscall.h>
-#include <sys/ioctl.h>
-#include <sys/poll.h>
-#include <sys/prctl.h>
-#include <sys/wait.h>
-#include <sys/uio.h>
-#include <sys/mman.h>
-
-#include <linux/unistd.h>
-#include <linux/types.h>
-
-#include "../../include/linux/perf_counter.h"
-
-
-/*
- * prctl(PR_TASK_PERF_COUNTERS_DISABLE) will (cheaply) disable all
- * counters in the current task.
- */
-#define PR_TASK_PERF_COUNTERS_DISABLE   31
-#define PR_TASK_PERF_COUNTERS_ENABLE    32
-
-#define ARRAY_SIZE(x) (sizeof(x) / sizeof((x)[0]))
-
-#define rdclock()                                       \
-({                                                      \
-        struct timespec ts;                             \
-                                                        \
-        clock_gettime(CLOCK_MONOTONIC, &ts);            \
-        ts.tv_sec * 1000000000ULL + ts.tv_nsec;         \
-})
-
-/*
- * Pick up some kernel type conventions:
- */
-#define __user
-#define asmlinkage
-
-#ifdef __x86_64__
-#define __NR_perf_counter_open 295
-#define rmb()		asm volatile("lfence" ::: "memory")
-#define cpu_relax()	asm volatile("rep; nop" ::: "memory");
-#endif
-
-#ifdef __i386__
-#define __NR_perf_counter_open 333
-#define rmb()		asm volatile("lfence" ::: "memory")
-#define cpu_relax()	asm volatile("rep; nop" ::: "memory");
-#endif
-
-#ifdef __powerpc__
-#define __NR_perf_counter_open 319
-#define rmb() 		asm volatile ("sync" ::: "memory")
-#define cpu_relax()	asm volatile ("" ::: "memory");
-#endif
-
-#define unlikely(x)	__builtin_expect(!!(x), 0)
-#define min(x, y) ({				\
-	typeof(x) _min1 = (x);			\
-	typeof(y) _min2 = (y);			\
-	(void) (&_min1 == &_min2);		\
-	_min1 < _min2 ? _min1 : _min2; })
-
-asmlinkage int sys_perf_counter_open(
-        struct perf_counter_hw_event    *hw_event_uptr          __user,
-        pid_t                           pid,
-        int                             cpu,
-        int                             group_fd,
-        unsigned long                   flags)
-{
-        return syscall(
-                __NR_perf_counter_open, hw_event_uptr, pid, cpu, group_fd, flags);
-}
-
-#define MAX_COUNTERS			64
-#define MAX_NR_CPUS			256
-
-#define EID(type, id) (((__u64)(type) << PERF_COUNTER_TYPE_SHIFT) | (id))
-
-static int			run_perfstat			=  0;
-static int			system_wide			=  0;
-
-static int			nr_counters			=  0;
-static __u64			event_id[MAX_COUNTERS]		= {
-	EID(PERF_TYPE_SOFTWARE, PERF_COUNT_TASK_CLOCK),
-	EID(PERF_TYPE_SOFTWARE, PERF_COUNT_CONTEXT_SWITCHES),
-	EID(PERF_TYPE_SOFTWARE, PERF_COUNT_CPU_MIGRATIONS),
-	EID(PERF_TYPE_SOFTWARE, PERF_COUNT_PAGE_FAULTS),
-
-	EID(PERF_TYPE_HARDWARE, PERF_COUNT_CPU_CYCLES),
-	EID(PERF_TYPE_HARDWARE, PERF_COUNT_INSTRUCTIONS),
-	EID(PERF_TYPE_HARDWARE, PERF_COUNT_CACHE_REFERENCES),
-	EID(PERF_TYPE_HARDWARE, PERF_COUNT_CACHE_MISSES),
-};
-static int			default_interval = 100000;
-static int			event_count[MAX_COUNTERS];
-static int			fd[MAX_NR_CPUS][MAX_COUNTERS];
-
-static __u64			count_filter		       = 100;
-
-static int			tid				= -1;
-static int			profile_cpu			= -1;
-static int			nr_cpus				=  0;
-static int			nmi				=  1;
-static unsigned int		realtime_prio			=  0;
-static int			group				=  0;
-static unsigned int		page_size;
-static unsigned int		mmap_pages			=  16;
-static int			use_mmap			= 0;
-static int			use_munmap			= 0;
-
-static char			*vmlinux;
-
-static char			*sym_filter;
-static unsigned long		filter_start;
-static unsigned long		filter_end;
-
-static int			delay_secs			=  2;
-static int			zero;
-static int			dump_symtab;
-
-static int			scale;
-
-struct source_line {
-	uint64_t		EIP;
-	unsigned long		count;
-	char			*line;
-	struct source_line	*next;
-};
-
-static struct source_line	*lines;
-static struct source_line	**lines_tail;
-
-const unsigned int default_count[] = {
-	1000000,
-	1000000,
-	  10000,
-	  10000,
-	1000000,
-	  10000,
-};
-
-static char *hw_event_names[] = {
-	"CPU cycles",
-	"instructions",
-	"cache references",
-	"cache misses",
-	"branches",
-	"branch misses",
-	"bus cycles",
-};
-
-static char *sw_event_names[] = {
-	"cpu clock ticks",
-	"task clock ticks",
-	"pagefaults",
-	"context switches",
-	"CPU migrations",
-	"minor faults",
-	"major faults",
-};
-
-struct event_symbol {
-	__u64 event;
-	char *symbol;
-};
-
-static struct event_symbol event_symbols[] = {
-	{EID(PERF_TYPE_HARDWARE, PERF_COUNT_CPU_CYCLES),		"cpu-cycles",		},
-	{EID(PERF_TYPE_HARDWARE, PERF_COUNT_CPU_CYCLES),		"cycles",		},
-	{EID(PERF_TYPE_HARDWARE, PERF_COUNT_INSTRUCTIONS),		"instructions",		},
-	{EID(PERF_TYPE_HARDWARE, PERF_COUNT_CACHE_REFERENCES),		"cache-references",	},
-	{EID(PERF_TYPE_HARDWARE, PERF_COUNT_CACHE_MISSES),		"cache-misses",		},
-	{EID(PERF_TYPE_HARDWARE, PERF_COUNT_BRANCH_INSTRUCTIONS),	"branch-instructions",	},
-	{EID(PERF_TYPE_HARDWARE, PERF_COUNT_BRANCH_INSTRUCTIONS),	"branches",		},
-	{EID(PERF_TYPE_HARDWARE, PERF_COUNT_BRANCH_MISSES),		"branch-misses",	},
-	{EID(PERF_TYPE_HARDWARE, PERF_COUNT_BUS_CYCLES),		"bus-cycles",		},
-
-	{EID(PERF_TYPE_SOFTWARE, PERF_COUNT_CPU_CLOCK),			"cpu-clock",		},
-	{EID(PERF_TYPE_SOFTWARE, PERF_COUNT_TASK_CLOCK),		"task-clock",		},
-	{EID(PERF_TYPE_SOFTWARE, PERF_COUNT_PAGE_FAULTS),		"page-faults",		},
-	{EID(PERF_TYPE_SOFTWARE, PERF_COUNT_PAGE_FAULTS),		"faults",		},
-	{EID(PERF_TYPE_SOFTWARE, PERF_COUNT_PAGE_FAULTS_MIN),		"minor-faults",		},
-	{EID(PERF_TYPE_SOFTWARE, PERF_COUNT_PAGE_FAULTS_MAJ),		"major-faults",		},
-	{EID(PERF_TYPE_SOFTWARE, PERF_COUNT_CONTEXT_SWITCHES),		"context-switches",	},
-	{EID(PERF_TYPE_SOFTWARE, PERF_COUNT_CONTEXT_SWITCHES),		"cs",			},
-	{EID(PERF_TYPE_SOFTWARE, PERF_COUNT_CPU_MIGRATIONS),		"cpu-migrations",	},
-	{EID(PERF_TYPE_SOFTWARE, PERF_COUNT_CPU_MIGRATIONS),		"migrations",		},
-};
-
-#define __PERF_COUNTER_FIELD(config, name) \
-	((config & PERF_COUNTER_##name##_MASK) >> PERF_COUNTER_##name##_SHIFT)
-
-#define PERF_COUNTER_RAW(config)	__PERF_COUNTER_FIELD(config, RAW)
-#define PERF_COUNTER_CONFIG(config)	__PERF_COUNTER_FIELD(config, CONFIG)
-#define PERF_COUNTER_TYPE(config)	__PERF_COUNTER_FIELD(config, TYPE)
-#define PERF_COUNTER_ID(config)		__PERF_COUNTER_FIELD(config, EVENT)
-
-static void display_events_help(void)
-{
-	unsigned int i;
-	__u64 e;
-
-	printf(
-	" -e EVENT     --event=EVENT   #  symbolic-name        abbreviations");
-
-	for (i = 0; i < ARRAY_SIZE(event_symbols); i++) {
-		int type, id;
-
-		e = event_symbols[i].event;
-		type = PERF_COUNTER_TYPE(e);
-		id = PERF_COUNTER_ID(e);
-
-		printf("\n                             %d:%d: %-20s",
-				type, id, event_symbols[i].symbol);
-	}
-
-	printf("\n"
-	"                           rNNN: raw PMU events (eventsel+umask)\n\n");
-}
-
-static void display_perfstat_help(void)
-{
-	printf(
-	"Usage: perfstat [<events...>] <cmd...>\n\n"
-	"PerfStat Options (up to %d event types can be specified):\n\n",
-		 MAX_COUNTERS);
-
-	display_events_help();
-
-	printf(
-	" -l                           # scale counter values\n"
-	" -a                           # system-wide collection\n");
-	exit(0);
-}
-
-static void display_help(void)
-{
-	if (run_perfstat)
-		return display_perfstat_help();
-
-	printf(
-	"Usage: kerneltop [<options>]\n"
-	"   Or: kerneltop -S [<options>] COMMAND [ARGS]\n\n"
-	"KernelTop Options (up to %d event types can be specified at once):\n\n",
-		 MAX_COUNTERS);
-
-	display_events_help();
-
-	printf(
-	" -S        --stat             # perfstat COMMAND\n"
-	" -a                           # system-wide collection (for perfstat)\n\n"
-	" -c CNT    --count=CNT        # event period to sample\n\n"
-	" -C CPU    --cpu=CPU          # CPU (-1 for all)                 [default: -1]\n"
-	" -p PID    --pid=PID          # PID of sampled task (-1 for all) [default: -1]\n\n"
-	" -l                           # show scale factor for RR events\n"
-	" -d delay  --delay=<seconds>  # sampling/display delay           [default:  2]\n"
-	" -f CNT    --filter=CNT       # min-event-count filter          [default: 100]\n\n"
-	" -r prio   --realtime=<prio>  # event acquisition runs with SCHED_FIFO policy\n"
-	" -s symbol --symbol=<symbol>  # function to be showed annotated one-shot\n"
-	" -x path   --vmlinux=<path>   # the vmlinux binary, required for -s use\n"
-	" -z        --zero             # zero counts after display\n"
-	" -D        --dump_symtab      # dump symbol table to stderr on startup\n"
-	" -m pages  --mmap_pages=<pages> # number of mmap data pages\n"
-	" -M        --mmap_info        # print mmap info stream\n"
-	" -U        --munmap_info      # print munmap info stream\n"
-	);
-
-	exit(0);
-}
-
-static char *event_name(int ctr)
-{
-	__u64 config = event_id[ctr];
-	int type = PERF_COUNTER_TYPE(config);
-	int id = PERF_COUNTER_ID(config);
-	static char buf[32];
-
-	if (PERF_COUNTER_RAW(config)) {
-		sprintf(buf, "raw 0x%llx", PERF_COUNTER_CONFIG(config));
-		return buf;
-	}
-
-	switch (type) {
-	case PERF_TYPE_HARDWARE:
-		if (id < PERF_HW_EVENTS_MAX)
-			return hw_event_names[id];
-		return "unknown-hardware";
-
-	case PERF_TYPE_SOFTWARE:
-		if (id < PERF_SW_EVENTS_MAX)
-			return sw_event_names[id];
-		return "unknown-software";
-
-	default:
-		break;
-	}
-
-	return "unknown";
-}
-
-/*
- * Each event can have multiple symbolic names.
- * Symbolic names are (almost) exactly matched.
- */
-static __u64 match_event_symbols(char *str)
-{
-	__u64 config, id;
-	int type;
-	unsigned int i;
-
-	if (sscanf(str, "r%llx", &config) == 1)
-		return config | PERF_COUNTER_RAW_MASK;
-
-	if (sscanf(str, "%d:%llu", &type, &id) == 2)
-		return EID(type, id);
-
-	for (i = 0; i < ARRAY_SIZE(event_symbols); i++) {
-		if (!strncmp(str, event_symbols[i].symbol,
-			     strlen(event_symbols[i].symbol)))
-			return event_symbols[i].event;
-	}
-
-	return ~0ULL;
-}
-
-static int parse_events(char *str)
-{
-	__u64 config;
-
-again:
-	if (nr_counters == MAX_COUNTERS)
-		return -1;
-
-	config = match_event_symbols(str);
-	if (config == ~0ULL)
-		return -1;
-
-	event_id[nr_counters] = config;
-	nr_counters++;
-
-	str = strstr(str, ",");
-	if (str) {
-		str++;
-		goto again;
-	}
-
-	return 0;
-}
-
-
-/*
- * perfstat
- */
-
-char fault_here[1000000];
-
-static void create_perfstat_counter(int counter)
-{
-	struct perf_counter_hw_event hw_event;
-
-	memset(&hw_event, 0, sizeof(hw_event));
-	hw_event.config		= event_id[counter];
-	hw_event.record_type	= 0;
-	hw_event.nmi		= 0;
-	if (scale)
-		hw_event.read_format	= PERF_FORMAT_TOTAL_TIME_ENABLED |
-					  PERF_FORMAT_TOTAL_TIME_RUNNING;
-
-	if (system_wide) {
-		int cpu;
-		for (cpu = 0; cpu < nr_cpus; cpu ++) {
-			fd[cpu][counter] = sys_perf_counter_open(&hw_event, -1, cpu, -1, 0);
-			if (fd[cpu][counter] < 0) {
-				printf("perfstat error: syscall returned with %d (%s)\n",
-						fd[cpu][counter], strerror(errno));
-				exit(-1);
-			}
-		}
-	} else {
-		hw_event.inherit	= 1;
-		hw_event.disabled	= 1;
-
-		fd[0][counter] = sys_perf_counter_open(&hw_event, 0, -1, -1, 0);
-		if (fd[0][counter] < 0) {
-			printf("perfstat error: syscall returned with %d (%s)\n",
-					fd[0][counter], strerror(errno));
-			exit(-1);
-		}
-	}
-}
-
-int do_perfstat(int argc, char *argv[])
-{
-	unsigned long long t0, t1;
-	int counter;
-	ssize_t res;
-	int status;
-	int pid;
-
-	if (!system_wide)
-		nr_cpus = 1;
-
-	for (counter = 0; counter < nr_counters; counter++)
-		create_perfstat_counter(counter);
-
-	argc -= optind;
-	argv += optind;
-
-	if (!argc)
-		display_help();
-
-	/*
-	 * Enable counters and exec the command:
-	 */
-	t0 = rdclock();
-	prctl(PR_TASK_PERF_COUNTERS_ENABLE);
-
-	if ((pid = fork()) < 0)
-		perror("failed to fork");
-	if (!pid) {
-		if (execvp(argv[0], argv)) {
-			perror(argv[0]);
-			exit(-1);
-		}
-	}
-	while (wait(&status) >= 0)
-		;
-	prctl(PR_TASK_PERF_COUNTERS_DISABLE);
-	t1 = rdclock();
-
-	fflush(stdout);
-
-	fprintf(stderr, "\n");
-	fprintf(stderr, " Performance counter stats for \'%s\':\n",
-		argv[0]);
-	fprintf(stderr, "\n");
-
-	for (counter = 0; counter < nr_counters; counter++) {
-		int cpu, nv;
-		__u64 count[3], single_count[3];
-		int scaled;
-
-		count[0] = count[1] = count[2] = 0;
-		nv = scale ? 3 : 1;
-		for (cpu = 0; cpu < nr_cpus; cpu ++) {
-			res = read(fd[cpu][counter],
-				   single_count, nv * sizeof(__u64));
-			assert(res == nv * sizeof(__u64));
-
-			count[0] += single_count[0];
-			if (scale) {
-				count[1] += single_count[1];
-				count[2] += single_count[2];
-			}
-		}
-
-		scaled = 0;
-		if (scale) {
-			if (count[2] == 0) {
-				fprintf(stderr, " %14s  %-20s\n",
-					"<not counted>", event_name(counter));
-				continue;
-			}
-			if (count[2] < count[1]) {
-				scaled = 1;
-				count[0] = (unsigned long long)
-					((double)count[0] * count[1] / count[2] + 0.5);
-			}
-		}
-
-		if (event_id[counter] == EID(PERF_TYPE_SOFTWARE, PERF_COUNT_CPU_CLOCK) ||
-		    event_id[counter] == EID(PERF_TYPE_SOFTWARE, PERF_COUNT_TASK_CLOCK)) {
-
-			double msecs = (double)count[0] / 1000000;
-
-			fprintf(stderr, " %14.6f  %-20s (msecs)",
-				msecs, event_name(counter));
-		} else {
-			fprintf(stderr, " %14Ld  %-20s (events)",
-				count[0], event_name(counter));
-		}
-		if (scaled)
-			fprintf(stderr, "  (scaled from %.2f%%)",
-				(double) count[2] / count[1] * 100);
-		fprintf(stderr, "\n");
-	}
-	fprintf(stderr, "\n");
-	fprintf(stderr, " Wall-clock time elapsed: %12.6f msecs\n",
-			(double)(t1-t0)/1e6);
-	fprintf(stderr, "\n");
-
-	return 0;
-}
-
-/*
- * Symbols
- */
-
-static uint64_t			min_ip;
-static uint64_t			max_ip = -1ll;
-
-struct sym_entry {
-	unsigned long long	addr;
-	char			*sym;
-	unsigned long		count[MAX_COUNTERS];
-	int			skip;
-	struct source_line	*source;
-};
-
-#define MAX_SYMS		100000
-
-static int sym_table_count;
-
-struct sym_entry		*sym_filter_entry;
-
-static struct sym_entry		sym_table[MAX_SYMS];
-
-static void show_details(struct sym_entry *sym);
-
-/*
- * Ordering weight: count-1 * count-2 * ... / count-n
- */
-static double sym_weight(const struct sym_entry *sym)
-{
-	double weight;
-	int counter;
-
-	weight = sym->count[0];
-
-	for (counter = 1; counter < nr_counters-1; counter++)
-		weight *= sym->count[counter];
-
-	weight /= (sym->count[counter] + 1);
-
-	return weight;
-}
-
-static int compare(const void *__sym1, const void *__sym2)
-{
-	const struct sym_entry *sym1 = __sym1, *sym2 = __sym2;
-
-	return sym_weight(sym1) < sym_weight(sym2);
-}
-
-static long			events;
-static long			userspace_events;
-static const char		CONSOLE_CLEAR[] = "";
-
-static struct sym_entry		tmp[MAX_SYMS];
-
-static void print_sym_table(void)
-{
-	int i, printed;
-	int counter;
-	float events_per_sec = events/delay_secs;
-	float kevents_per_sec = (events-userspace_events)/delay_secs;
-	float sum_kevents = 0.0;
-
-	events = userspace_events = 0;
-	memcpy(tmp, sym_table, sizeof(sym_table[0])*sym_table_count);
-	qsort(tmp, sym_table_count, sizeof(tmp[0]), compare);
-
-	for (i = 0; i < sym_table_count && tmp[i].count[0]; i++)
-		sum_kevents += tmp[i].count[0];
-
-	write(1, CONSOLE_CLEAR, strlen(CONSOLE_CLEAR));
-
-	printf(
-"------------------------------------------------------------------------------\n");
-	printf( " KernelTop:%8.0f irqs/sec  kernel:%4.1f%% [%s, ",
-		events_per_sec,
-		100.0 - (100.0*((events_per_sec-kevents_per_sec)/events_per_sec)),
-		nmi ? "NMI" : "IRQ");
-
-	if (nr_counters == 1)
-		printf("%d ", event_count[0]);
-
-	for (counter = 0; counter < nr_counters; counter++) {
-		if (counter)
-			printf("/");
-
-		printf("%s", event_name(counter));
-	}
-
-	printf( "], ");
-
-	if (tid != -1)
-		printf(" (tid: %d", tid);
-	else
-		printf(" (all");
-
-	if (profile_cpu != -1)
-		printf(", cpu: %d)\n", profile_cpu);
-	else {
-		if (tid != -1)
-			printf(")\n");
-		else
-			printf(", %d CPUs)\n", nr_cpus);
-	}
-
-	printf("------------------------------------------------------------------------------\n\n");
-
-	if (nr_counters == 1)
-		printf("             events    pcnt");
-	else
-		printf("  weight     events    pcnt");
-
-	printf("         RIP          kernel function\n"
-	       	       "  ______     ______   _____   ________________   _______________\n\n"
-	);
-
-	for (i = 0, printed = 0; i < sym_table_count; i++) {
-		float pcnt;
-		int count;
-
-		if (printed <= 18 && tmp[i].count[0] >= count_filter) {
-			pcnt = 100.0 - (100.0*((sum_kevents-tmp[i].count[0])/sum_kevents));
-
-			if (nr_counters == 1)
-				printf("%19.2f - %4.1f%% - %016llx : %s\n",
-					sym_weight(tmp + i),
-					pcnt, tmp[i].addr, tmp[i].sym);
-			else
-				printf("%8.1f %10ld - %4.1f%% - %016llx : %s\n",
-					sym_weight(tmp + i),
-					tmp[i].count[0],
-					pcnt, tmp[i].addr, tmp[i].sym);
-			printed++;
-		}
-		/*
-		 * Add decay to the counts:
-		 */
-		for (count = 0; count < nr_counters; count++)
-			sym_table[i].count[count] = zero ? 0 : sym_table[i].count[count] * 7 / 8;
-	}
-
-	if (sym_filter_entry)
-		show_details(sym_filter_entry);
-
-	{
-		struct pollfd stdin_poll = { .fd = 0, .events = POLLIN };
-
-		if (poll(&stdin_poll, 1, 0) == 1) {
-			printf("key pressed - exiting.\n");
-			exit(0);
-		}
-	}
-}
-
-static void *display_thread(void *arg)
-{
-	printf("KernelTop refresh period: %d seconds\n", delay_secs);
-
-	while (!sleep(delay_secs))
-		print_sym_table();
-
-	return NULL;
-}
-
-static int read_symbol(FILE *in, struct sym_entry *s)
-{
-	static int filter_match = 0;
-	char *sym, stype;
-	char str[500];
-	int rc, pos;
-
-	rc = fscanf(in, "%llx %c %499s", &s->addr, &stype, str);
-	if (rc == EOF)
-		return -1;
-
-	assert(rc == 3);
-
-	/* skip until end of line: */
-	pos = strlen(str);
-	do {
-		rc = fgetc(in);
-		if (rc == '\n' || rc == EOF || pos >= 499)
-			break;
-		str[pos] = rc;
-		pos++;
-	} while (1);
-	str[pos] = 0;
-
-	sym = str;
-
-	/* Filter out known duplicates and non-text symbols. */
-	if (!strcmp(sym, "_text"))
-		return 1;
-	if (!min_ip && !strcmp(sym, "_stext"))
-		return 1;
-	if (!strcmp(sym, "_etext") || !strcmp(sym, "_sinittext"))
-		return 1;
-	if (stype != 'T' && stype != 't')
-		return 1;
-	if (!strncmp("init_module", sym, 11) || !strncmp("cleanup_module", sym, 14))
-		return 1;
-	if (strstr(sym, "_text_start") || strstr(sym, "_text_end"))
-		return 1;
-
-	s->sym = malloc(strlen(str));
-	assert(s->sym);
-
-	strcpy((char *)s->sym, str);
-	s->skip = 0;
-
-	/* Tag events to be skipped. */
-	if (!strcmp("default_idle", s->sym) || !strcmp("cpu_idle", s->sym))
-		s->skip = 1;
-	else if (!strcmp("enter_idle", s->sym) || !strcmp("exit_idle", s->sym))
-		s->skip = 1;
-	else if (!strcmp("mwait_idle", s->sym))
-		s->skip = 1;
-
-	if (filter_match == 1) {
-		filter_end = s->addr;
-		filter_match = -1;
-		if (filter_end - filter_start > 10000) {
-			printf("hm, too large filter symbol <%s> - skipping.\n",
-				sym_filter);
-			printf("symbol filter start: %016lx\n", filter_start);
-			printf("                end: %016lx\n", filter_end);
-			filter_end = filter_start = 0;
-			sym_filter = NULL;
-			sleep(1);
-		}
-	}
-	if (filter_match == 0 && sym_filter && !strcmp(s->sym, sym_filter)) {
-		filter_match = 1;
-		filter_start = s->addr;
-	}
-
-	return 0;
-}
-
-int compare_addr(const void *__sym1, const void *__sym2)
-{
-	const struct sym_entry *sym1 = __sym1, *sym2 = __sym2;
-
-	return sym1->addr > sym2->addr;
-}
-
-static void sort_symbol_table(void)
-{
-	int i, dups;
-
-	do {
-		qsort(sym_table, sym_table_count, sizeof(sym_table[0]), compare_addr);
-		for (i = 0, dups = 0; i < sym_table_count; i++) {
-			if (sym_table[i].addr == sym_table[i+1].addr) {
-				sym_table[i+1].addr = -1ll;
-				dups++;
-			}
-		}
-		sym_table_count -= dups;
-	} while(dups);
-}
-
-static void parse_symbols(void)
-{
-	struct sym_entry *last;
-
-	FILE *kallsyms = fopen("/proc/kallsyms", "r");
-
-	if (!kallsyms) {
-		printf("Could not open /proc/kallsyms - no CONFIG_KALLSYMS_ALL=y?\n");
-		exit(-1);
-	}
-
-	while (!feof(kallsyms)) {
-		if (read_symbol(kallsyms, &sym_table[sym_table_count]) == 0) {
-			sym_table_count++;
-			assert(sym_table_count <= MAX_SYMS);
-		}
-	}
-
-	sort_symbol_table();
-	min_ip = sym_table[0].addr;
-	max_ip = sym_table[sym_table_count-1].addr;
-	last = sym_table + sym_table_count++;
-
-	last->addr = -1ll;
-	last->sym = "<end>";
-
-	if (filter_end) {
-		int count;
-		for (count=0; count < sym_table_count; count ++) {
-			if (!strcmp(sym_table[count].sym, sym_filter)) {
-				sym_filter_entry = &sym_table[count];
-				break;
-			}
-		}
-	}
-	if (dump_symtab) {
-		int i;
-
-		for (i = 0; i < sym_table_count; i++)
-			fprintf(stderr, "%llx %s\n",
-				sym_table[i].addr, sym_table[i].sym);
-	}
-}
-
-/*
- * Source lines
- */
-
-static void parse_vmlinux(char *filename)
-{
-	FILE *file;
-	char command[PATH_MAX*2];
-	if (!filename)
-		return;
-
-	sprintf(command, "objdump --start-address=0x%016lx --stop-address=0x%016lx -dS %s", filter_start, filter_end, filename);
-
-	file = popen(command, "r");
-	if (!file)
-		return;
-
-	lines_tail = &lines;
-	while (!feof(file)) {
-		struct source_line *src;
-		size_t dummy = 0;
-		char *c;
-
-		src = malloc(sizeof(struct source_line));
-		assert(src != NULL);
-		memset(src, 0, sizeof(struct source_line));
-
-		if (getline(&src->line, &dummy, file) < 0)
-			break;
-		if (!src->line)
-			break;
-
-		c = strchr(src->line, '\n');
-		if (c)
-			*c = 0;
-
-		src->next = NULL;
-		*lines_tail = src;
-		lines_tail = &src->next;
-
-		if (strlen(src->line)>8 && src->line[8] == ':')
-			src->EIP = strtoull(src->line, NULL, 16);
-		if (strlen(src->line)>8 && src->line[16] == ':')
-			src->EIP = strtoull(src->line, NULL, 16);
-	}
-	pclose(file);
-}
-
-static void record_precise_ip(uint64_t ip)
-{
-	struct source_line *line;
-
-	for (line = lines; line; line = line->next) {
-		if (line->EIP == ip)
-			line->count++;
-		if (line->EIP > ip)
-			break;
-	}
-}
-
-static void lookup_sym_in_vmlinux(struct sym_entry *sym)
-{
-	struct source_line *line;
-	char pattern[PATH_MAX];
-	sprintf(pattern, "<%s>:", sym->sym);
-
-	for (line = lines; line; line = line->next) {
-		if (strstr(line->line, pattern)) {
-			sym->source = line;
-			break;
-		}
-	}
-}
-
-static void show_lines(struct source_line *line_queue, int line_queue_count)
-{
-	int i;
-	struct source_line *line;
-
-	line = line_queue;
-	for (i = 0; i < line_queue_count; i++) {
-		printf("%8li\t%s\n", line->count, line->line);
-		line = line->next;
-	}
-}
-
-#define TRACE_COUNT     3
-
-static void show_details(struct sym_entry *sym)
-{
-	struct source_line *line;
-	struct source_line *line_queue = NULL;
-	int displayed = 0;
-	int line_queue_count = 0;
-
-	if (!sym->source)
-		lookup_sym_in_vmlinux(sym);
-	if (!sym->source)
-		return;
-
-	printf("Showing details for %s\n", sym->sym);
-
-	line = sym->source;
-	while (line) {
-		if (displayed && strstr(line->line, ">:"))
-			break;
-
-		if (!line_queue_count)
-			line_queue = line;
-		line_queue_count ++;
-
-		if (line->count >= count_filter) {
-			show_lines(line_queue, line_queue_count);
-			line_queue_count = 0;
-			line_queue = NULL;
-		} else if (line_queue_count > TRACE_COUNT) {
-			line_queue = line_queue->next;
-			line_queue_count --;
-		}
-
-		line->count = 0;
-		displayed++;
-		if (displayed > 300)
-			break;
-		line = line->next;
-	}
-}
-
-/*
- * Binary search in the histogram table and record the hit:
- */
-static void record_ip(uint64_t ip, int counter)
-{
-	int left_idx, middle_idx, right_idx, idx;
-	unsigned long left, middle, right;
-
-	record_precise_ip(ip);
-
-	left_idx = 0;
-	right_idx = sym_table_count-1;
-	assert(ip <= max_ip && ip >= min_ip);
-
-	while (left_idx + 1 < right_idx) {
-		middle_idx = (left_idx + right_idx) / 2;
-
-		left   = sym_table[  left_idx].addr;
-		middle = sym_table[middle_idx].addr;
-		right  = sym_table[ right_idx].addr;
-
-		if (!(left <= middle && middle <= right)) {
-			printf("%016lx...\n%016lx...\n%016lx\n", left, middle, right);
-			printf("%d %d %d\n", left_idx, middle_idx, right_idx);
-		}
-		assert(left <= middle && middle <= right);
-		if (!(left <= ip && ip <= right)) {
-			printf(" left: %016lx\n", left);
-			printf("   ip: %016lx\n", (unsigned long)ip);
-			printf("right: %016lx\n", right);
-		}
-		assert(left <= ip && ip <= right);
-		/*
-		 * [ left .... target .... middle .... right ]
-		 *   => right := middle
-		 */
-		if (ip < middle) {
-			right_idx = middle_idx;
-			continue;
-		}
-		/*
-		 * [ left .... middle ... target ... right ]
-		 *   => left := middle
-		 */
-		left_idx = middle_idx;
-	}
-
-	idx = left_idx;
-
-	if (!sym_table[idx].skip)
-		sym_table[idx].count[counter]++;
-	else events--;
-}
-
-static void process_event(uint64_t ip, int counter)
-{
-	events++;
-
-	if (ip < min_ip || ip > max_ip) {
-		userspace_events++;
-		return;
-	}
-
-	record_ip(ip, counter);
-}
-
-static void process_options(int argc, char *argv[])
-{
-	int error = 0, counter;
-
-	if (strstr(argv[0], "perfstat"))
-		run_perfstat = 1;
-
-	for (;;) {
-		int option_index = 0;
-		/** Options for getopt */
-		static struct option long_options[] = {
-			{"count",	required_argument,	NULL, 'c'},
-			{"cpu",		required_argument,	NULL, 'C'},
-			{"delay",	required_argument,	NULL, 'd'},
-			{"dump_symtab",	no_argument,		NULL, 'D'},
-			{"event",	required_argument,	NULL, 'e'},
-			{"filter",	required_argument,	NULL, 'f'},
-			{"group",	required_argument,	NULL, 'g'},
-			{"help",	no_argument,		NULL, 'h'},
-			{"nmi",		required_argument,	NULL, 'n'},
-			{"mmap_info",	no_argument,		NULL, 'M'},
-			{"mmap_pages",	required_argument,	NULL, 'm'},
-			{"munmap_info",	no_argument,		NULL, 'U'},
-			{"pid",		required_argument,	NULL, 'p'},
-			{"realtime",	required_argument,	NULL, 'r'},
-			{"scale",	no_argument,		NULL, 'l'},
-			{"symbol",	required_argument,	NULL, 's'},
-			{"stat",	no_argument,		NULL, 'S'},
-			{"vmlinux",	required_argument,	NULL, 'x'},
-			{"zero",	no_argument,		NULL, 'z'},
-			{NULL,		0,			NULL,  0 }
-		};
-		int c = getopt_long(argc, argv, "+:ac:C:d:De:f:g:hln:m:p:r:s:Sx:zMU",
-				    long_options, &option_index);
-		if (c == -1)
-			break;
-
-		switch (c) {
-		case 'a': system_wide			=	       1; break;
-		case 'c': default_interval		=   atoi(optarg); break;
-		case 'C':
-			/* CPU and PID are mutually exclusive */
-			if (tid != -1) {
-				printf("WARNING: CPU switch overriding PID\n");
-				sleep(1);
-				tid = -1;
-			}
-			profile_cpu			=   atoi(optarg); break;
-		case 'd': delay_secs			=   atoi(optarg); break;
-		case 'D': dump_symtab			=              1; break;
-
-		case 'e': error				= parse_events(optarg); break;
-
-		case 'f': count_filter			=   atoi(optarg); break;
-		case 'g': group				=   atoi(optarg); break;
-		case 'h':      				  display_help(); break;
-		case 'l': scale				=	       1; break;
-		case 'n': nmi				=   atoi(optarg); break;
-		case 'p':
-			/* CPU and PID are mutually exclusive */
-			if (profile_cpu != -1) {
-				printf("WARNING: PID switch overriding CPU\n");
-				sleep(1);
-				profile_cpu = -1;
-			}
-			tid				=   atoi(optarg); break;
-		case 'r': realtime_prio			=   atoi(optarg); break;
-		case 's': sym_filter			= strdup(optarg); break;
-		case 'S': run_perfstat			=	       1; break;
-		case 'x': vmlinux			= strdup(optarg); break;
-		case 'z': zero				=              1; break;
-		case 'm': mmap_pages			=   atoi(optarg); break;
-		case 'M': use_mmap			=              1; break;
-		case 'U': use_munmap			=              1; break;
-		default: error = 1; break;
-		}
-	}
-	if (error)
-		display_help();
-
-	if (!nr_counters) {
-		if (run_perfstat)
-			nr_counters = 8;
-		else {
-			nr_counters = 1;
-			event_id[0] = 0;
-		}
-	}
-
-	for (counter = 0; counter < nr_counters; counter++) {
-		if (event_count[counter])
-			continue;
-
-		event_count[counter] = default_interval;
-	}
-}
-
-struct mmap_data {
-	int counter;
-	void *base;
-	unsigned int mask;
-	unsigned int prev;
-};
-
-static unsigned int mmap_read_head(struct mmap_data *md)
-{
-	struct perf_counter_mmap_page *pc = md->base;
-	int head;
-
-	head = pc->data_head;
-	rmb();
-
-	return head;
-}
-
-struct timeval last_read, this_read;
-
-static void mmap_read(struct mmap_data *md)
-{
-	unsigned int head = mmap_read_head(md);
-	unsigned int old = md->prev;
-	unsigned char *data = md->base + page_size;
-	int diff;
-
-	gettimeofday(&this_read, NULL);
-
-	/*
-	 * If we're further behind than half the buffer, there's a chance
-	 * the writer will bite our tail and screw up the events under us.
-	 *
-	 * If we somehow ended up ahead of the head, we got messed up.
-	 *
-	 * In either case, truncate and restart at head.
-	 */
-	diff = head - old;
-	if (diff > md->mask / 2 || diff < 0) {
-		struct timeval iv;
-		unsigned long msecs;
-
-		timersub(&this_read, &last_read, &iv);
-		msecs = iv.tv_sec*1000 + iv.tv_usec/1000;
-
-		fprintf(stderr, "WARNING: failed to keep up with mmap data."
-				"  Last read %lu msecs ago.\n", msecs);
-
-		/*
-		 * head points to a known good entry, start there.
-		 */
-		old = head;
-	}
-
-	last_read = this_read;
-
-	for (; old != head;) {
-		struct ip_event {
-			struct perf_event_header header;
-			__u64 ip;
-			__u32 pid, tid;
-		};
-		struct mmap_event {
-			struct perf_event_header header;
-			__u32 pid, tid;
-			__u64 start;
-			__u64 len;
-			__u64 pgoff;
-			char filename[PATH_MAX];
-		};
-
-		typedef union event_union {
-			struct perf_event_header header;
-			struct ip_event ip;
-			struct mmap_event mmap;
-		} event_t;
-
-		event_t *event = (event_t *)&data[old & md->mask];
-
-		event_t event_copy;
-
-		unsigned int size = event->header.size;
-
-		/*
-		 * Event straddles the mmap boundary -- header should always
-		 * be inside due to u64 alignment of output.
-		 */
-		if ((old & md->mask) + size != ((old + size) & md->mask)) {
-			unsigned int offset = old;
-			unsigned int len = min(sizeof(*event), size), cpy;
-			void *dst = &event_copy;
-
-			do {
-				cpy = min(md->mask + 1 - (offset & md->mask), len);
-				memcpy(dst, &data[offset & md->mask], cpy);
-				offset += cpy;
-				dst += cpy;
-				len -= cpy;
-			} while (len);
-
-			event = &event_copy;
-		}
-
-		old += size;
-
-		if (event->header.misc & PERF_EVENT_MISC_OVERFLOW) {
-			if (event->header.type & PERF_RECORD_IP)
-				process_event(event->ip.ip, md->counter);
-		} else {
-			switch (event->header.type) {
-				case PERF_EVENT_MMAP:
-				case PERF_EVENT_MUNMAP:
-					printf("%s: %Lu %Lu %Lu %s\n",
-							event->header.type == PERF_EVENT_MMAP
-							? "mmap" : "munmap",
-							event->mmap.start,
-							event->mmap.len,
-							event->mmap.pgoff,
-							event->mmap.filename);
-					break;
-			}
-		}
-	}
-
-	md->prev = old;
-}
-
-int main(int argc, char *argv[])
-{
-	struct pollfd event_array[MAX_NR_CPUS * MAX_COUNTERS];
-	struct mmap_data mmap_array[MAX_NR_CPUS][MAX_COUNTERS];
-	struct perf_counter_hw_event hw_event;
-	pthread_t thread;
-	int i, counter, group_fd, nr_poll = 0;
-	unsigned int cpu;
-	int ret;
-
-	page_size = sysconf(_SC_PAGE_SIZE);
-
-	process_options(argc, argv);
-
-	nr_cpus = sysconf(_SC_NPROCESSORS_ONLN);
-	assert(nr_cpus <= MAX_NR_CPUS);
-	assert(nr_cpus >= 0);
-
-	if (run_perfstat)
-		return do_perfstat(argc, argv);
-
-	if (tid != -1 || profile_cpu != -1)
-		nr_cpus = 1;
-
-	parse_symbols();
-	if (vmlinux && sym_filter_entry)
-		parse_vmlinux(vmlinux);
-
-	for (i = 0; i < nr_cpus; i++) {
-		group_fd = -1;
-		for (counter = 0; counter < nr_counters; counter++) {
-
-			cpu	= profile_cpu;
-			if (tid == -1 && profile_cpu == -1)
-				cpu = i;
-
-			memset(&hw_event, 0, sizeof(hw_event));
-			hw_event.config		= event_id[counter];
-			hw_event.irq_period	= event_count[counter];
-			hw_event.record_type	= PERF_RECORD_IP | PERF_RECORD_TID;
-			hw_event.nmi		= nmi;
-			hw_event.mmap		= use_mmap;
-			hw_event.munmap		= use_munmap;
-
-			fd[i][counter] = sys_perf_counter_open(&hw_event, tid, cpu, group_fd, 0);
-			if (fd[i][counter] < 0) {
-				int err = errno;
-				printf("kerneltop error: syscall returned with %d (%s)\n",
-					fd[i][counter], strerror(err));
-				if (err == EPERM)
-					printf("Are you root?\n");
-				exit(-1);
-			}
-			assert(fd[i][counter] >= 0);
-			fcntl(fd[i][counter], F_SETFL, O_NONBLOCK);
-
-			/*
-			 * First counter acts as the group leader:
-			 */
-			if (group && group_fd == -1)
-				group_fd = fd[i][counter];
-
-			event_array[nr_poll].fd = fd[i][counter];
-			event_array[nr_poll].events = POLLIN;
-			nr_poll++;
-
-			mmap_array[i][counter].counter = counter;
-			mmap_array[i][counter].prev = 0;
-			mmap_array[i][counter].mask = mmap_pages*page_size - 1;
-			mmap_array[i][counter].base = mmap(NULL, (mmap_pages+1)*page_size,
-					PROT_READ, MAP_SHARED, fd[i][counter], 0);
-			if (mmap_array[i][counter].base == MAP_FAILED) {
-				printf("kerneltop error: failed to mmap with %d (%s)\n",
-						errno, strerror(errno));
-				exit(-1);
-			}
-		}
-	}
-
-	if (pthread_create(&thread, NULL, display_thread, NULL)) {
-		printf("Could not create display thread.\n");
-		exit(-1);
-	}
-
-	if (realtime_prio) {
-		struct sched_param param;
-
-		param.sched_priority = realtime_prio;
-		if (sched_setscheduler(0, SCHED_FIFO, &param)) {
-			printf("Could not set realtime priority.\n");
-			exit(-1);
-		}
-	}
-
-	while (1) {
-		int hits = events;
-
-		for (i = 0; i < nr_cpus; i++) {
-			for (counter = 0; counter < nr_counters; counter++)
-				mmap_read(&mmap_array[i][counter]);
-		}
-
-		if (hits == events)
-			ret = poll(event_array, nr_poll, 100);
-	}
-
-	return 0;
-}

Documentation/perf_counter/perf.c

@@ -249,6 +249,7 @@ static void handle_internal_command(int argc, const char **argv)
 	const char *cmd = argv[0];
 	static struct cmd_struct commands[] = {
 		{ "top", cmd_top, 0 },
+		{ "stat", cmd_stat, 0 },
 	};
 	int i;
 	static const char ext[] = STRIP_EXTENSION;