2010-02-04 07:08:15 +00:00
|
|
|
perf-lock(1)
|
|
|
|
|
============
|
|
|
|
|
|
|
|
|
|
NAME
|
|
|
|
|
----
|
|
|
|
|
perf-lock - Analyze lock events
|
|
|
|
|
|
|
|
|
|
SYNOPSIS
|
|
|
|
|
--------
|
|
|
|
|
[verse]
|
2022-07-25 18:31:22 +00:00
|
|
|
'perf lock' {record|report|script|info|contention}
|
2010-02-04 07:08:15 +00:00
|
|
|
|
|
|
|
|
DESCRIPTION
|
|
|
|
|
-----------
|
|
|
|
|
You can analyze various lock behaviours
|
|
|
|
|
and statistics with this 'perf lock' command.
|
|
|
|
|
|
|
|
|
|
'perf lock record <command>' records lock events
|
|
|
|
|
between start and end <command>. And this command
|
|
|
|
|
produces the file "perf.data" which contains tracing
|
|
|
|
|
results of lock events.
|
|
|
|
|
|
|
|
|
|
'perf lock report' reports statistical data.
|
|
|
|
|
|
2012-01-29 08:55:56 +00:00
|
|
|
'perf lock script' shows raw lock events.
|
|
|
|
|
|
|
|
|
|
'perf lock info' shows metadata like threads or addresses
|
|
|
|
|
of lock instances.
|
|
|
|
|
|
2022-07-25 18:31:22 +00:00
|
|
|
'perf lock contention' shows contention statistics.
|
|
|
|
|
|
2011-02-22 20:53:12 +00:00
|
|
|
COMMON OPTIONS
|
|
|
|
|
--------------
|
2010-12-01 01:57:14 +00:00
|
|
|
|
|
|
|
|
-i::
|
|
|
|
|
--input=<file>::
|
2011-12-07 09:02:54 +00:00
|
|
|
Input file name. (default: perf.data unless stdin is a fifo)
|
2010-12-01 01:57:14 +00:00
|
|
|
|
|
|
|
|
-v::
|
|
|
|
|
--verbose::
|
|
|
|
|
Be more verbose (show symbol address, etc).
|
|
|
|
|
|
2022-09-24 00:42:20 +00:00
|
|
|
-q::
|
|
|
|
|
--quiet::
|
2022-10-18 09:41:36 +00:00
|
|
|
Do not show any warnings or messages. (Suppress -v)
|
2022-09-24 00:42:20 +00:00
|
|
|
|
2010-12-01 01:57:14 +00:00
|
|
|
-D::
|
|
|
|
|
--dump-raw-trace::
|
|
|
|
|
Dump raw trace in ASCII.
|
|
|
|
|
|
2017-11-16 13:06:49 +00:00
|
|
|
-f::
|
|
|
|
|
--force::
|
2021-09-24 08:19:42 +00:00
|
|
|
Don't complain, do it.
|
2017-11-16 13:06:49 +00:00
|
|
|
|
2022-06-15 16:32:17 +00:00
|
|
|
--vmlinux=<file>::
|
|
|
|
|
vmlinux pathname
|
|
|
|
|
|
|
|
|
|
--kallsyms=<file>::
|
|
|
|
|
kallsyms pathname
|
|
|
|
|
|
|
|
|
|
|
2011-02-22 20:53:12 +00:00
|
|
|
REPORT OPTIONS
|
|
|
|
|
--------------
|
|
|
|
|
|
|
|
|
|
-k::
|
|
|
|
|
--key=<value>::
|
|
|
|
|
Sorting key. Possible values: acquired (default), contended,
|
2013-09-09 02:19:19 +00:00
|
|
|
avg_wait, wait_total, wait_max, wait_min.
|
2011-02-22 20:53:12 +00:00
|
|
|
|
2022-03-23 23:02:59 +00:00
|
|
|
-F::
|
|
|
|
|
--field=<value>::
|
|
|
|
|
Output fields. By default it shows all the fields but users can
|
|
|
|
|
customize that using this. Possible values: acquired, contended,
|
|
|
|
|
avg_wait, wait_total, wait_max, wait_min.
|
|
|
|
|
|
2022-01-27 00:00:49 +00:00
|
|
|
-c::
|
|
|
|
|
--combine-locks::
|
|
|
|
|
Merge lock instances in the same class (based on name).
|
|
|
|
|
|
2022-05-21 01:08:11 +00:00
|
|
|
-t::
|
|
|
|
|
--threads::
|
|
|
|
|
The -t option is to show per-thread lock stat like below:
|
|
|
|
|
|
|
|
|
|
$ perf lock report -t -F acquired,contended,avg_wait
|
|
|
|
|
|
|
|
|
|
Name acquired contended avg wait (ns)
|
|
|
|
|
|
|
|
|
|
perf 240569 9 5784
|
|
|
|
|
swapper 106610 19 543
|
|
|
|
|
:15789 17370 2 14538
|
|
|
|
|
ContainerMgr 8981 6 874
|
|
|
|
|
sleep 5275 1 11281
|
|
|
|
|
ContainerThread 4416 4 944
|
|
|
|
|
RootPressureThr 3215 5 1215
|
|
|
|
|
rcu_preempt 2954 0 0
|
|
|
|
|
ContainerMgr 2560 0 0
|
|
|
|
|
unnamed 1873 0 0
|
|
|
|
|
EventManager_De 1845 1 636
|
|
|
|
|
futex-default-S 1609 0 0
|
|
|
|
|
|
2022-09-24 00:42:19 +00:00
|
|
|
-E::
|
|
|
|
|
--entries=<value>::
|
|
|
|
|
Display this many entries.
|
|
|
|
|
|
|
|
|
|
|
2012-01-29 08:55:56 +00:00
|
|
|
INFO OPTIONS
|
|
|
|
|
------------
|
|
|
|
|
|
|
|
|
|
-t::
|
|
|
|
|
--threads::
|
|
|
|
|
dump thread list in perf.data
|
|
|
|
|
|
|
|
|
|
-m::
|
|
|
|
|
--map::
|
|
|
|
|
dump map of lock instances (address:name table)
|
|
|
|
|
|
2022-09-24 00:42:19 +00:00
|
|
|
|
2022-07-25 18:31:23 +00:00
|
|
|
CONTENTION OPTIONS
|
|
|
|
|
--------------
|
|
|
|
|
|
|
|
|
|
-k::
|
|
|
|
|
--key=<value>::
|
|
|
|
|
Sorting key. Possible values: contended, wait_total (default),
|
|
|
|
|
wait_max, wait_min, avg_wait.
|
|
|
|
|
|
|
|
|
|
-F::
|
|
|
|
|
--field=<value>::
|
|
|
|
|
Output fields. By default it shows all but the wait_min fields
|
|
|
|
|
and users can customize that using this. Possible values:
|
|
|
|
|
contended, wait_total, wait_max, wait_min, avg_wait.
|
|
|
|
|
|
2022-07-25 18:31:24 +00:00
|
|
|
-t::
|
|
|
|
|
--threads::
|
|
|
|
|
Show per-thread lock contention stat
|
|
|
|
|
|
2022-07-29 20:07:55 +00:00
|
|
|
-b::
|
|
|
|
|
--use-bpf::
|
|
|
|
|
Use BPF program to collect lock contention stats instead of
|
|
|
|
|
using the input data.
|
|
|
|
|
|
2022-07-29 20:07:56 +00:00
|
|
|
-a::
|
|
|
|
|
--all-cpus::
|
|
|
|
|
System-wide collection from all CPUs.
|
|
|
|
|
|
|
|
|
|
-C::
|
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>
2022-12-19 20:17:28 +00:00
|
|
|
--cpu=<value>::
|
2022-07-29 20:07:56 +00:00
|
|
|
Collect samples only on the list of CPUs provided. Multiple CPUs can be
|
|
|
|
|
provided as a comma-separated list with no space: 0,1. Ranges of CPUs
|
|
|
|
|
are specified with -: 0-2. Default is to monitor all CPUs.
|
|
|
|
|
|
|
|
|
|
-p::
|
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>
2022-12-19 20:17:28 +00:00
|
|
|
--pid=<value>::
|
2022-07-29 20:07:56 +00:00
|
|
|
Record events on existing process ID (comma separated list).
|
|
|
|
|
|
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>
2022-12-19 20:17:28 +00:00
|
|
|
--tid=<value>::
|
2022-07-29 20:07:56 +00:00
|
|
|
Record events on existing thread ID (comma separated list).
|
|
|
|
|
|
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>
2022-12-19 20:17:28 +00:00
|
|
|
--map-nr-entries=<value>::
|
2022-08-02 19:10:03 +00:00
|
|
|
Maximum number of BPF map entries (default: 10240).
|
|
|
|
|
|
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>
2022-12-19 20:17:28 +00:00
|
|
|
--max-stack=<value>::
|
2022-09-12 05:53:13 +00:00
|
|
|
Maximum stack depth when collecting lock contention (default: 8).
|
|
|
|
|
|
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>
2022-12-19 20:17:28 +00:00
|
|
|
--stack-skip=<value>::
|
2022-09-12 05:53:13 +00:00
|
|
|
Number of stack depth to skip when finding a lock caller (default: 3).
|
|
|
|
|
|
2022-09-24 00:42:19 +00:00
|
|
|
-E::
|
|
|
|
|
--entries=<value>::
|
|
|
|
|
Display this many entries.
|
|
|
|
|
|
2022-12-09 19:07:26 +00:00
|
|
|
-l::
|
|
|
|
|
--lock-addr::
|
|
|
|
|
Show lock contention stat by address
|
|
|
|
|
|
2023-02-07 00:24:02 +00:00
|
|
|
-o::
|
|
|
|
|
--lock-owner::
|
|
|
|
|
Show lock contention stat by owners. Implies --threads and
|
|
|
|
|
requires --use-bpf.
|
|
|
|
|
|
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>
2022-12-19 20:17:28 +00:00
|
|
|
-Y::
|
|
|
|
|
--type-filter=<value>::
|
|
|
|
|
Show lock contention only for given lock types (comma separated list).
|
|
|
|
|
Available values are:
|
|
|
|
|
semaphore, spinlock, rwlock, rwlock:R, rwlock:W, rwsem, rwsem:R, rwsem:W,
|
|
|
|
|
rtmutex, rwlock-rt, rwlock-rt:R, rwlock-rt:W, pcpu-sem, pcpu-sem:R, pcpu-sem:W,
|
|
|
|
|
mutex
|
|
|
|
|
|
|
|
|
|
Note that RW-variant of locks have :R and :W suffix. Names without the
|
|
|
|
|
suffix are shortcuts for the both variants. Ex) rwsem = rwsem:R + rwsem:W.
|
|
|
|
|
|
2022-12-19 20:17:30 +00:00
|
|
|
-L::
|
|
|
|
|
--lock-filter=<value>::
|
|
|
|
|
Show lock contention only for given lock addresses or names (comma separated list).
|
|
|
|
|
|
2023-01-26 00:09:36 +00:00
|
|
|
-S::
|
|
|
|
|
--callstack-filter=<value>::
|
|
|
|
|
Show lock contention only if the callstack contains the given string.
|
|
|
|
|
Note that it matches the substring so 'rq' would match both 'raw_spin_rq_lock'
|
|
|
|
|
and 'irq_enter_rcu'.
|
|
|
|
|
|
2022-07-25 18:31:23 +00:00
|
|
|
|
2010-02-04 07:08:15 +00:00
|
|
|
SEE ALSO
|
|
|
|
|
--------
|
|
|
|
|
linkperf:perf[1]
|