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The -S/--callstack-filter is to limit display entries having the given
string in the callstack (not only in the caller in the output).
The following example shows lock contention results if the callstack
has 'net' substring somewhere. Note that the caller '__dev_queue_xmit'
does not match to it, but it has 'inet6_csk_xmit' in the callstack.
This applies even if you don't use -v option to show the full callstack.
$ sudo ./perf lock con -abv -S net sleep 1
...
contended total wait max wait avg wait type caller
5 70.20 us 16.13 us 14.04 us spinlock __dev_queue_xmit+0xb6d
0xffffffffa5dd1c60 _raw_spin_lock+0x30
0xffffffffa5b8f6ed __dev_queue_xmit+0xb6d
0xffffffffa5cd8267 ip6_finish_output2+0x2c7
0xffffffffa5cdac14 ip6_finish_output+0x1d4
0xffffffffa5cdb477 ip6_xmit+0x457
0xffffffffa5d1fd17 inet6_csk_xmit+0xd7
0xffffffffa5c5f4aa __tcp_transmit_skb+0x54a
0xffffffffa5c6467d tcp_keepalive_timer+0x2fd
Signed-off-by: Namhyung Kim <namhyung@kernel.org>
Cc: Adrian Hunter <adrian.hunter@intel.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/20230126000936.3017683-1-namhyung@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
200 lines
4.8 KiB
Plaintext
200 lines
4.8 KiB
Plaintext
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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'perf lock' {record|report|script|info|contention}
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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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'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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'perf lock contention' shows contention statistics.
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COMMON OPTIONS
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--------------
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-i::
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--input=<file>::
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Input file name. (default: perf.data unless stdin is a fifo)
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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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-q::
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--quiet::
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Do not show any warnings or messages. (Suppress -v)
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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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-f::
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--force::
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Don't complain, do it.
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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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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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avg_wait, wait_total, wait_max, wait_min.
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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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-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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-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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-E::
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--entries=<value>::
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Display this many entries.
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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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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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-t::
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--threads::
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Show per-thread lock contention stat
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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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-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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--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=<value>::
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Record events on existing process ID (comma separated list).
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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=<value>::
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Maximum number of BPF map entries (default: 10240).
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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=<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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--entries=<value>::
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Display this many entries.
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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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-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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-L::
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--lock-filter=<value>::
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Show lock contention only for given lock addresses or names (comma separated list).
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-S::
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--callstack-filter=<value>::
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Show lock contention only if the callstack contains the given string.
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Note that it matches the substring so 'rq' would match both 'raw_spin_rq_lock'
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and 'irq_enter_rcu'.
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SEE ALSO
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--------
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linkperf:perf[1]
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