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@@ -15,6 +15,10 @@
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#include <linux/seq_file.h>
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#include <linux/kallsyms.h>
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#include <linux/debug_locks.h>
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+#include <linux/vmalloc.h>
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+#include <linux/sort.h>
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+#include <asm/uaccess.h>
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+#include <asm/div64.h>
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#include "lockdep_internals.h"
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@@ -344,6 +348,262 @@ static const struct file_operations proc_lockdep_stats_operations = {
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.release = seq_release,
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};
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+#ifdef CONFIG_LOCK_STAT
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+
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+struct lock_stat_data {
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+ struct lock_class *class;
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+ struct lock_class_stats stats;
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+};
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+
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+struct lock_stat_seq {
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+ struct lock_stat_data *iter;
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+ struct lock_stat_data *iter_end;
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+ struct lock_stat_data stats[MAX_LOCKDEP_KEYS];
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+};
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+
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+/*
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+ * sort on absolute number of contentions
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+ */
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+static int lock_stat_cmp(const void *l, const void *r)
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+{
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+ const struct lock_stat_data *dl = l, *dr = r;
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+ unsigned long nl, nr;
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+
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+ nl = dl->stats.read_waittime.nr + dl->stats.write_waittime.nr;
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+ nr = dr->stats.read_waittime.nr + dr->stats.write_waittime.nr;
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+
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+ return nr - nl;
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+}
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+
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+static void seq_line(struct seq_file *m, char c, int offset, int length)
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+{
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+ int i;
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+
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+ for (i = 0; i < offset; i++)
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+ seq_puts(m, " ");
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+ for (i = 0; i < length; i++)
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+ seq_printf(m, "%c", c);
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+ seq_puts(m, "\n");
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+}
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+
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+static void snprint_time(char *buf, size_t bufsiz, s64 nr)
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+{
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+ unsigned long rem;
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+
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+ rem = do_div(nr, 1000); /* XXX: do_div_signed */
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+ snprintf(buf, bufsiz, "%lld.%02d", (long long)nr, ((int)rem+5)/10);
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+}
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+
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+static void seq_time(struct seq_file *m, s64 time)
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+{
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+ char num[15];
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+
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+ snprint_time(num, sizeof(num), time);
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+ seq_printf(m, " %14s", num);
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+}
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+
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+static void seq_lock_time(struct seq_file *m, struct lock_time *lt)
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+{
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+ seq_printf(m, "%14lu", lt->nr);
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+ seq_time(m, lt->min);
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+ seq_time(m, lt->max);
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+ seq_time(m, lt->total);
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+}
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+
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+static void seq_stats(struct seq_file *m, struct lock_stat_data *data)
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+{
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+ char name[39];
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+ struct lock_class *class;
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+ struct lock_class_stats *stats;
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+ int i, namelen;
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+
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+ class = data->class;
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+ stats = &data->stats;
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+
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+ snprintf(name, 38, "%s", class->name);
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+ namelen = strlen(name);
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+
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+ if (stats->write_holdtime.nr) {
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+ if (stats->read_holdtime.nr)
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+ seq_printf(m, "%38s-W:", name);
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+ else
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+ seq_printf(m, "%40s:", name);
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+
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+ seq_lock_time(m, &stats->write_waittime);
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+ seq_puts(m, " ");
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+ seq_lock_time(m, &stats->write_holdtime);
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+ seq_puts(m, "\n");
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+ }
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+
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+ if (stats->read_holdtime.nr) {
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+ seq_printf(m, "%38s-R:", name);
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+ seq_lock_time(m, &stats->read_waittime);
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+ seq_puts(m, " ");
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+ seq_lock_time(m, &stats->read_holdtime);
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+ seq_puts(m, "\n");
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+ }
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+
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+ if (stats->read_waittime.nr + stats->write_waittime.nr == 0)
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+ return;
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+
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+ if (stats->read_holdtime.nr)
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+ namelen += 2;
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+
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+ for (i = 0; i < ARRAY_SIZE(class->contention_point); i++) {
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+ char sym[KSYM_SYMBOL_LEN];
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+ char ip[32];
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+
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+ if (class->contention_point[i] == 0)
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+ break;
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+
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+ if (!i)
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+ seq_line(m, '-', 40-namelen, namelen);
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+
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+ sprint_symbol(sym, class->contention_point[i]);
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+ snprintf(ip, sizeof(ip), "[<%p>]",
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+ (void *)class->contention_point[i]);
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+ seq_printf(m, "%40s %14lu %29s %s\n", name,
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+ stats->contention_point[i],
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+ ip, sym);
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+ }
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+ if (i) {
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+ seq_puts(m, "\n");
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+ seq_line(m, '.', 0, 40 + 1 + 8 * (14 + 1));
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+ seq_puts(m, "\n");
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+ }
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+}
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+
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+static void seq_header(struct seq_file *m)
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+{
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+ seq_printf(m, "lock_stat version 0.1\n");
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+ seq_line(m, '-', 0, 40 + 1 + 8 * (14 + 1));
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+ seq_printf(m, "%40s %14s %14s %14s %14s %14s %14s %14s %14s\n",
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+ "class name",
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+ "contentions",
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+ "waittime-min",
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+ "waittime-max",
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+ "waittime-total",
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+ "acquisitions",
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+ "holdtime-min",
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+ "holdtime-max",
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+ "holdtime-total");
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+ seq_line(m, '-', 0, 40 + 1 + 8 * (14 + 1));
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+ seq_printf(m, "\n");
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+}
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+
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+static void *ls_start(struct seq_file *m, loff_t *pos)
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+{
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+ struct lock_stat_seq *data = m->private;
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+
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+ if (data->iter == data->stats)
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+ seq_header(m);
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+
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+ return data->iter;
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+}
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+
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+static void *ls_next(struct seq_file *m, void *v, loff_t *pos)
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+{
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+ struct lock_stat_seq *data = m->private;
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+
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+ (*pos)++;
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+
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+ data->iter = v;
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+ data->iter++;
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+ if (data->iter == data->iter_end)
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+ data->iter = NULL;
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+
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+ return data->iter;
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+}
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+
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+static void ls_stop(struct seq_file *m, void *v)
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+{
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+}
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+
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+static int ls_show(struct seq_file *m, void *v)
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+{
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+ struct lock_stat_seq *data = m->private;
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+
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+ seq_stats(m, data->iter);
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+ return 0;
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+}
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+
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+static struct seq_operations lockstat_ops = {
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+ .start = ls_start,
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+ .next = ls_next,
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+ .stop = ls_stop,
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+ .show = ls_show,
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+};
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+
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+static int lock_stat_open(struct inode *inode, struct file *file)
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+{
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+ int res;
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+ struct lock_class *class;
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+ struct lock_stat_seq *data = vmalloc(sizeof(struct lock_stat_seq));
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+
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+ if (!data)
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+ return -ENOMEM;
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+
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+ res = seq_open(file, &lockstat_ops);
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+ if (!res) {
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+ struct lock_stat_data *iter = data->stats;
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+ struct seq_file *m = file->private_data;
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+
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+ data->iter = iter;
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+ list_for_each_entry(class, &all_lock_classes, lock_entry) {
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+ iter->class = class;
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+ iter->stats = lock_stats(class);
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+ iter++;
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+ }
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+ data->iter_end = iter;
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+
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+ sort(data->stats, data->iter_end - data->iter,
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+ sizeof(struct lock_stat_data),
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+ lock_stat_cmp, NULL);
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+
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+ m->private = data;
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+ } else
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+ vfree(data);
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+
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+ return res;
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+}
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+
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+static ssize_t lock_stat_write(struct file *file, const char __user *buf,
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+ size_t count, loff_t *ppos)
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+{
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+ struct lock_class *class;
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+ char c;
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+
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+ if (count) {
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+ if (get_user(c, buf))
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+ return -EFAULT;
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+
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+ if (c != '0')
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+ return count;
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+
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+ list_for_each_entry(class, &all_lock_classes, lock_entry)
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+ clear_lock_stats(class);
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+ }
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+ return count;
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+}
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+
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+static int lock_stat_release(struct inode *inode, struct file *file)
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+{
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+ struct seq_file *seq = file->private_data;
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+
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+ vfree(seq->private);
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+ seq->private = NULL;
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+ return seq_release(inode, file);
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+}
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+
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+static const struct file_operations proc_lock_stat_operations = {
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+ .open = lock_stat_open,
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+ .write = lock_stat_write,
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+ .read = seq_read,
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+ .llseek = seq_lseek,
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+ .release = lock_stat_release,
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+};
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+#endif /* CONFIG_LOCK_STAT */
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+
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static int __init lockdep_proc_init(void)
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{
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struct proc_dir_entry *entry;
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@@ -356,6 +616,12 @@ static int __init lockdep_proc_init(void)
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if (entry)
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entry->proc_fops = &proc_lockdep_stats_operations;
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+#ifdef CONFIG_LOCK_STAT
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+ entry = create_proc_entry("lock_stat", S_IRUSR, NULL);
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+ if (entry)
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+ entry->proc_fops = &proc_lock_stat_operations;
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+#endif
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+
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return 0;
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}
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Peter Zijlstra