perf evlist: Always do automatic allocation of pollfd and mmap structures

At first tools were required to do that, but while writing the python
bindings to simplify the API I made them auto-allocate when needed.

This just makes record, stat and top use that auto allocation,
simplifying them a bit.

Cc: David Ahern <dsahern@gmail.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Stephane Eranian <eranian@google.com>
Link: http://lkml.kernel.org/n/tip-iokhcvkzzijr3keioubx8hlq@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

tools/perf/builtin-record.c

@@ -778,16 +778,10 @@ int cmd_record(int argc, const char **argv, const char *prefix __used)
 		usage_with_options(record_usage, record_options);
 
 	list_for_each_entry(pos, &evsel_list->entries, node) {
-		if (perf_evsel__alloc_fd(pos, evsel_list->cpus->nr,
-					 evsel_list->threads->nr) < 0)
-			goto out_free_fd;
 		if (perf_header__push_event(pos->attr.config, event_name(pos)))
 			goto out_free_fd;
 	}
 
-	if (perf_evlist__alloc_pollfd(evsel_list) < 0)
-		goto out_free_fd;
-
 	if (rec->opts.user_interval != ULLONG_MAX)
 		rec->opts.default_interval = rec->opts.user_interval;
 	if (rec->opts.user_freq != UINT_MAX)

tools/perf/builtin-stat.c

@@ -1240,8 +1240,7 @@ int cmd_stat(int argc, const char **argv, const char *prefix __used)
 
 	list_for_each_entry(pos, &evsel_list->entries, node) {
 		if (perf_evsel__alloc_stat_priv(pos) < 0 ||
-		    perf_evsel__alloc_counts(pos, evsel_list->cpus->nr) < 0 ||
-		    perf_evsel__alloc_fd(pos, evsel_list->cpus->nr, evsel_list->threads->nr) < 0)
+		    perf_evsel__alloc_counts(pos, evsel_list->cpus->nr) < 0)
 			goto out_free_fd;
 	}
 

tools/perf/builtin-top.c

@@ -1034,9 +1034,7 @@ parse_callchain_opt(const struct option *opt, const char *arg, int unset)
 		symbol_conf.use_callchain = false;
 
 		return 0;
-	}
-
-	else
+	} else
 		return -1;
 
 	/* get the min percentage */
@@ -1225,22 +1223,13 @@ int cmd_top(int argc, const char **argv, const char *prefix __used)
 	}
 
 	list_for_each_entry(pos, &top.evlist->entries, node) {
-		if (perf_evsel__alloc_fd(pos, top.evlist->cpus->nr,
-					 top.evlist->threads->nr) < 0)
-			goto out_free_fd;
 		/*
 		 * Fill in the ones not specifically initialized via -c:
 		 */
-		if (pos->attr.sample_period)
-			continue;
-
-		pos->attr.sample_period = top.default_interval;
+		if (!pos->attr.sample_period)
+			pos->attr.sample_period = top.default_interval;
 	}
 
-	if (perf_evlist__alloc_pollfd(top.evlist) < 0 ||
-	    perf_evlist__alloc_mmap(top.evlist) < 0)
-		goto out_free_fd;
-
 	top.sym_evsel = list_entry(top.evlist->entries.next, struct perf_evsel, node);
 
 	symbol_conf.priv_size = sizeof(struct annotation);
@@ -1270,7 +1259,7 @@ int cmd_top(int argc, const char **argv, const char *prefix __used)
 	}
 
 	status = __cmd_top(&top);
-out_free_fd:
+
 	perf_evlist__delete(top.evlist);
 
 	return status;

tools/perf/util/evlist.c

@@ -275,7 +275,7 @@ void perf_evlist__enable(struct perf_evlist *evlist)
 	}
 }
 
-int perf_evlist__alloc_pollfd(struct perf_evlist *evlist)
+static int perf_evlist__alloc_pollfd(struct perf_evlist *evlist)
 {
 	int nfds = evlist->cpus->nr * evlist->threads->nr * evlist->nr_entries;
 	evlist->pollfd = malloc(sizeof(struct pollfd) * nfds);
@@ -431,7 +431,7 @@ void perf_evlist__munmap(struct perf_evlist *evlist)
 	evlist->mmap = NULL;
 }
 
-int perf_evlist__alloc_mmap(struct perf_evlist *evlist)
+static int perf_evlist__alloc_mmap(struct perf_evlist *evlist)
 {
 	evlist->nr_mmaps = evlist->cpus->nr;
 	if (evlist->cpus->map[0] == -1)

tools/perf/util/evlist.h

@@ -72,7 +72,6 @@ int perf_evlist__set_tracepoints_handlers(struct perf_evlist *evlist,
 void perf_evlist__id_add(struct perf_evlist *evlist, struct perf_evsel *evsel,
 			 int cpu, int thread, u64 id);
 
-int perf_evlist__alloc_pollfd(struct perf_evlist *evlist);
 void perf_evlist__add_pollfd(struct perf_evlist *evlist, int fd);
 
 struct perf_evsel *perf_evlist__id2evsel(struct perf_evlist *evlist, u64 id);
@@ -89,7 +88,6 @@ int perf_evlist__prepare_workload(struct perf_evlist *evlist,
 				  const char *argv[]);
 int perf_evlist__start_workload(struct perf_evlist *evlist);
 
-int perf_evlist__alloc_mmap(struct perf_evlist *evlist);
 int perf_evlist__mmap(struct perf_evlist *evlist, unsigned int pages,
 		      bool overwrite);
 void perf_evlist__munmap(struct perf_evlist *evlist);