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perf lock contention: Add -Y/--type-filter option
The -Y/--type-filter option is to filter the result for specific lock
types only. It can accept comma-separated values. Note that it would
accept type names like one in the output. spinlock, mutex, rwsem:R and
so on.
For RW-variant lock types, it converts the name to the both variants.
In other words, "rwsem" is same as "rwsem:R,rwsem:W". Also note that
"mutex" has two different encoding - one for sleeping wait, another for
optimistic spinning. Add "mutex-spin" entry for the lock_type_table so
that we can add it for "mutex" under the table.
$ sudo ./perf lock record -a -- ./perf bench sched messaging
$ sudo ./perf lock con -E 5 -Y spinlock
contended total wait max wait avg wait type caller
802 1.26 ms 11.73 us 1.58 us spinlock __wake_up_common_lock+0x62
13 787.16 us 105.44 us 60.55 us spinlock remove_wait_queue+0x14
12 612.96 us 78.70 us 51.08 us spinlock prepare_to_wait+0x27
114 340.68 us 12.61 us 2.99 us spinlock try_to_wake_up+0x1f5
83 226.38 us 9.15 us 2.73 us spinlock folio_lruvec_lock_irqsave+0x5e
Committer notes:
Make get_type_flag() return UINT_MAX for error instad of -1UL, as that
function returns 'unsigned int' and we store the value on a 'unsigned
int' 'flags' variable which makes clang unhappy:
35 98.23 fedora:37 : FAIL clang version 15.0.6 (Fedora 15.0.6-1.fc37)
builtin-lock.c:2012:14: error: result of comparison of constant 18446744073709551615 with expression of type 'unsigned int' is always true [-Werror,-Wtautological-constant-out-of-range-compare]
if (flags != -1UL) {
~~~~~ ^ ~~~~
builtin-lock.c:2021:14: error: result of comparison of constant 18446744073709551615 with expression of type 'unsigned int' is always true [-Werror,-Wtautological-constant-out-of-range-compare]
if (flags != -1UL) {
~~~~~ ^ ~~~~
builtin-lock.c:2037:14: error: result of comparison of constant 18446744073709551615 with expression of type 'unsigned int' is always true [-Werror,-Wtautological-constant-out-of-range-compare]
if (flags != -1UL) {
~~~~~ ^ ~~~~
3 errors generated.
Signed-off-by: Namhyung Kim <namhyung@kernel.org>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Blake Jones <blakejones@google.com>
Cc: Ian Rogers <irogers@google.com>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Song Liu <song@kernel.org>
Cc: bpf@vger.kernel.org
Link: https://lore.kernel.org/r/20221219201732.460111-3-namhyung@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Namhyung Kim
Arnaldo Carvalho de Melo
parent
59119c09ae
commit
b4a7eff93c
@ -143,25 +143,25 @@ CONTENTION OPTIONS
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System-wide collection from all CPUs.
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-C::
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--cpu::
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--cpu=<value>::
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Collect samples only on the list of CPUs provided. Multiple CPUs can be
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provided as a comma-separated list with no space: 0,1. Ranges of CPUs
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are specified with -: 0-2. Default is to monitor all CPUs.
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-p::
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--pid=::
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--pid=<value>::
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Record events on existing process ID (comma separated list).
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--tid=::
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--tid=<value>::
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Record events on existing thread ID (comma separated list).
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--map-nr-entries::
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--map-nr-entries=<value>::
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Maximum number of BPF map entries (default: 10240).
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--max-stack::
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--max-stack=<value>::
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Maximum stack depth when collecting lock contention (default: 8).
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--stack-skip
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--stack-skip=<value>::
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Number of stack depth to skip when finding a lock caller (default: 3).
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-E::
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@ -172,6 +172,17 @@ CONTENTION OPTIONS
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--lock-addr::
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Show lock contention stat by address
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-Y::
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--type-filter=<value>::
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Show lock contention only for given lock types (comma separated list).
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Available values are:
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semaphore, spinlock, rwlock, rwlock:R, rwlock:W, rwsem, rwsem:R, rwsem:W,
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rtmutex, rwlock-rt, rwlock-rt:R, rwlock-rt:W, pcpu-sem, pcpu-sem:R, pcpu-sem:W,
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mutex
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Note that RW-variant of locks have :R and :W suffix. Names without the
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suffix are shortcuts for the both variants. Ex) rwsem = rwsem:R + rwsem:W.
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SEE ALSO
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--------
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@ -63,6 +63,8 @@ static int max_stack_depth = CONTENTION_STACK_DEPTH;
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static int stack_skip = CONTENTION_STACK_SKIP;
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static int print_nr_entries = INT_MAX / 2;
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static struct lock_filter filters;
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static enum lock_aggr_mode aggr_mode = LOCK_AGGR_ADDR;
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static struct thread_stat *thread_stat_find(u32 tid)
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@ -990,8 +992,9 @@ static int report_lock_contention_begin_event(struct evsel *evsel,
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struct thread_stat *ts;
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struct lock_seq_stat *seq;
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u64 addr = evsel__intval(evsel, sample, "lock_addr");
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unsigned int flags = evsel__intval(evsel, sample, "flags");
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u64 key;
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int ret;
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int i, ret;
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ret = get_key_by_aggr_mode(&key, addr, evsel, sample);
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if (ret < 0)
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@ -1001,7 +1004,6 @@ static int report_lock_contention_begin_event(struct evsel *evsel,
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if (!ls) {
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char buf[128];
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const char *name = "";
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unsigned int flags = evsel__intval(evsel, sample, "flags");
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struct machine *machine = &session->machines.host;
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struct map *kmap;
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struct symbol *sym;
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@ -1036,6 +1038,20 @@ static int report_lock_contention_begin_event(struct evsel *evsel,
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}
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}
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if (filters.nr_types) {
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bool found = false;
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for (i = 0; i < filters.nr_types; i++) {
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if (flags == filters.types[i]) {
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found = true;
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break;
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}
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}
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if (!found)
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return 0;
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}
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ts = thread_stat_findnew(sample->tid);
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if (!ts)
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return -ENOMEM;
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@ -1454,6 +1470,8 @@ static const struct {
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{ LCB_F_PERCPU | LCB_F_WRITE, "pcpu-sem:W" },
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{ LCB_F_MUTEX, "mutex" },
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{ LCB_F_MUTEX | LCB_F_SPIN, "mutex" },
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/* alias for get_type_flag() */
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{ LCB_F_MUTEX | LCB_F_SPIN, "mutex-spin" },
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};
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static const char *get_type_str(unsigned int flags)
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@ -1465,6 +1483,21 @@ static const char *get_type_str(unsigned int flags)
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return "unknown";
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}
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static unsigned int get_type_flag(const char *str)
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{
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for (unsigned int i = 0; i < ARRAY_SIZE(lock_type_table); i++) {
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if (!strcmp(lock_type_table[i].name, str))
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return lock_type_table[i].flags;
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}
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return UINT_MAX;
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}
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static void lock_filter_finish(void)
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{
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zfree(&filters.types);
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filters.nr_types = 0;
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}
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static void sort_contention_result(void)
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{
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sort_result();
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@ -1507,6 +1540,9 @@ static void print_contention_result(struct lock_contention *con)
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if (st->broken)
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bad++;
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if (!st->wait_time_total)
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continue;
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list_for_each_entry(key, &lock_keys, list) {
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key->print(key, st);
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pr_info(" ");
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@ -1753,6 +1789,7 @@ static int __cmd_contention(int argc, const char **argv)
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print_contention_result(&con);
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out_delete:
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lock_filter_finish();
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evlist__delete(con.evlist);
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lock_contention_finish();
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perf_session__delete(session);
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@ -1884,6 +1921,79 @@ static int parse_max_stack(const struct option *opt, const char *str,
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return 0;
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}
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static bool add_lock_type(unsigned int flags)
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{
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unsigned int *tmp;
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tmp = realloc(filters.types, (filters.nr_types + 1) * sizeof(*filters.types));
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if (tmp == NULL)
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return false;
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tmp[filters.nr_types++] = flags;
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filters.types = tmp;
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return true;
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}
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static int parse_lock_type(const struct option *opt __maybe_unused, const char *str,
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int unset __maybe_unused)
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{
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char *s, *tmp, *tok;
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int ret = 0;
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s = strdup(str);
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if (s == NULL)
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return -1;
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for (tok = strtok_r(s, ", ", &tmp); tok; tok = strtok_r(NULL, ", ", &tmp)) {
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unsigned int flags = get_type_flag(tok);
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if (flags == -1U) {
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char buf[32];
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if (strchr(tok, ':'))
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continue;
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/* try :R and :W suffixes for rwlock, rwsem, ... */
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scnprintf(buf, sizeof(buf), "%s:R", tok);
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flags = get_type_flag(buf);
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if (flags != UINT_MAX) {
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if (!add_lock_type(flags)) {
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ret = -1;
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break;
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}
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}
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scnprintf(buf, sizeof(buf), "%s:W", tok);
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flags = get_type_flag(buf);
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if (flags != UINT_MAX) {
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if (!add_lock_type(flags)) {
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ret = -1;
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break;
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}
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}
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continue;
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}
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if (!add_lock_type(flags)) {
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ret = -1;
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break;
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}
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if (!strcmp(tok, "mutex")) {
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flags = get_type_flag("mutex-spin");
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if (flags != UINT_MAX) {
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if (!add_lock_type(flags)) {
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ret = -1;
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break;
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}
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}
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}
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}
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free(s);
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return ret;
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}
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int cmd_lock(int argc, const char **argv)
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{
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const struct option lock_options[] = {
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@ -1947,6 +2057,8 @@ int cmd_lock(int argc, const char **argv)
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"Default: " __stringify(CONTENTION_STACK_SKIP)),
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OPT_INTEGER('E', "entries", &print_nr_entries, "display this many functions"),
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OPT_BOOLEAN('l', "lock-addr", &show_lock_addrs, "show lock stats by address"),
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OPT_CALLBACK('Y', "type-filter", NULL, "FLAGS",
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"Filter specific type of locks", parse_lock_type),
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OPT_PARENT(lock_options)
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};
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@ -5,6 +5,11 @@
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#include <linux/list.h>
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#include <linux/rbtree.h>
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struct lock_filter {
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int nr_types;
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unsigned int *types;
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};
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struct lock_stat {
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struct hlist_node hash_entry;
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struct rb_node rb; /* used for sorting */
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