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