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Date: Wed, 26 Jan 2022 16:00:49 -0800
From: Namhyung Kim <namhyung@...nel.org>
To: Arnaldo Carvalho de Melo <acme@...nel.org>,
Jiri Olsa <jolsa@...hat.com>
Cc: Ingo Molnar <mingo@...nel.org>,
Peter Zijlstra <peterz@...radead.org>,
LKML <linux-kernel@...r.kernel.org>,
Andi Kleen <ak@...ux.intel.com>,
Ian Rogers <irogers@...gle.com>
Subject: [PATCH 5/6] perf lock: Add -c/--combine-locks option
The -c or --combine-locks option is to merge lock instances in the
same class into a single entry. It compares the name of the locks
and marks duplicated entries using lock_stat->combined.
# perf lock report
Name acquired contended avg wait (ns) total wait (ns) max wait (ns) min wait (ns)
rcu_read_lock 251225 0 0 0 0 0
&(ei->i_block_re... 8731 0 0 0 0 0
&sb->s_type->i_l... 8731 0 0 0 0 0
hrtimer_bases.lock 5261 0 0 0 0 0
hrtimer_bases.lock 2626 0 0 0 0 0
hrtimer_bases.lock 1953 0 0 0 0 0
hrtimer_bases.lock 1382 0 0 0 0 0
cpu_hotplug_lock 1350 0 0 0 0 0
hrtimer_bases.lock 1273 0 0 0 0 0
hrtimer_bases.lock 1269 0 0 0 0 0
# perf lock report -c
Name acquired contended avg wait (ns) total wait (ns) max wait (ns) min wait (ns)
rcu_read_lock 251225 0 0 0 0 0
hrtimer_bases.lock 39450 0 0 0 0 0
&sb->s_type->i_l... 10301 1 662 662 662 662
ptlock_ptr(page) 10173 2 701 1402 760 642
&(ei->i_block_re... 8732 0 0 0 0 0
&xa->xa_lock 8088 0 0 0 0 0
&base->lock 6705 0 0 0 0 0
&p->pi_lock 5549 0 0 0 0 0
&dentry->d_lockr... 5010 4 1274 5097 1844 789
&ep->lock 3958 0 0 0 0 0
Acked-by: Jiri Olsa <jolsa@...hat.com>
Signed-off-by: Namhyung Kim <namhyung@...nel.org>
---
tools/perf/Documentation/perf-lock.txt | 4 ++
tools/perf/builtin-lock.c | 68 ++++++++++++++++++++++++++
2 files changed, 72 insertions(+)
diff --git a/tools/perf/Documentation/perf-lock.txt b/tools/perf/Documentation/perf-lock.txt
index 1b4d452923d7..f5eb95788969 100644
--- a/tools/perf/Documentation/perf-lock.txt
+++ b/tools/perf/Documentation/perf-lock.txt
@@ -54,6 +54,10 @@ REPORT OPTIONS
Sorting key. Possible values: acquired (default), contended,
avg_wait, wait_total, wait_max, wait_min.
+-c::
+--combine-locks::
+ Merge lock instances in the same class (based on name).
+
INFO OPTIONS
------------
diff --git a/tools/perf/builtin-lock.c b/tools/perf/builtin-lock.c
index f6adf3cdd1e2..bbfeba79426a 100644
--- a/tools/perf/builtin-lock.c
+++ b/tools/perf/builtin-lock.c
@@ -65,6 +65,7 @@ struct lock_stat {
u64 wait_time_max;
int discard; /* flag of blacklist */
+ int combined;
};
/*
@@ -115,6 +116,8 @@ struct thread_stat {
static struct rb_root thread_stats;
+static bool combine_locks;
+
static struct thread_stat *thread_stat_find(u32 tid)
{
struct rb_node *node;
@@ -241,6 +244,7 @@ static const char *sort_key = "acquired";
static int (*compare)(struct lock_stat *, struct lock_stat *);
+static struct rb_root sorted; /* place to store intermediate data */
static struct rb_root result; /* place to store sorted data */
#define DEF_KEY_LOCK(name, fn_suffix) \
@@ -274,6 +278,49 @@ static int select_key(void)
return -1;
}
+static void combine_lock_stats(struct lock_stat *st)
+{
+ struct rb_node **rb = &sorted.rb_node;
+ struct rb_node *parent = NULL;
+ struct lock_stat *p;
+ int ret;
+
+ while (*rb) {
+ p = container_of(*rb, struct lock_stat, rb);
+ parent = *rb;
+
+ if (st->name && p->name)
+ ret = strcmp(st->name, p->name);
+ else
+ ret = !!st->name - !!p->name;
+
+ if (ret == 0) {
+ p->nr_acquired += st->nr_acquired;
+ p->nr_contended += st->nr_contended;
+ p->wait_time_total += st->wait_time_total;
+
+ if (p->nr_contended)
+ p->avg_wait_time = p->wait_time_total / p->nr_contended;
+
+ if (p->wait_time_min > st->wait_time_min)
+ p->wait_time_min = st->wait_time_min;
+ if (p->wait_time_max < st->wait_time_max)
+ p->wait_time_max = st->wait_time_max;
+
+ st->combined = 1;
+ return;
+ }
+
+ if (ret < 0)
+ rb = &(*rb)->rb_left;
+ else
+ rb = &(*rb)->rb_right;
+ }
+
+ rb_link_node(&st->rb, parent, rb);
+ rb_insert_color(&st->rb, &sorted);
+}
+
static void insert_to_result(struct lock_stat *st,
int (*bigger)(struct lock_stat *, struct lock_stat *))
{
@@ -281,6 +328,9 @@ static void insert_to_result(struct lock_stat *st,
struct rb_node *parent = NULL;
struct lock_stat *p;
+ if (combine_locks && st->combined)
+ return;
+
while (*rb) {
p = container_of(*rb, struct lock_stat, rb);
parent = *rb;
@@ -833,6 +883,21 @@ static int process_sample_event(struct perf_tool *tool __maybe_unused,
return err;
}
+static void combine_result(void)
+{
+ unsigned int i;
+ struct lock_stat *st;
+
+ if (!combine_locks)
+ return;
+
+ for (i = 0; i < LOCKHASH_SIZE; i++) {
+ hlist_for_each_entry(st, &lockhash_table[i], hash_entry) {
+ combine_lock_stats(st);
+ }
+ }
+}
+
static void sort_result(void)
{
unsigned int i;
@@ -896,6 +961,7 @@ static int __cmd_report(bool display_info)
if (display_info) /* used for info subcommand */
err = dump_info();
else {
+ combine_result();
sort_result();
print_result();
}
@@ -970,6 +1036,8 @@ int cmd_lock(int argc, const char **argv)
OPT_STRING('k', "key", &sort_key, "acquired",
"key for sorting (acquired / contended / avg_wait / wait_total / wait_max / wait_min)"),
/* TODO: type */
+ OPT_BOOLEAN('c', "combine-locks", &combine_locks,
+ "combine locks in the same class"),
OPT_PARENT(lock_options)
};
--
2.35.0.rc0.227.g00780c9af4-goog
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