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perf-record(1)
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==============
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NAME
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----
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perf-record - Run a command and record its profile into perf.data
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SYNOPSIS
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--------
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[verse]
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'perf record' [-e <EVENT> | --event=EVENT] [-l] [-a] <command>
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'perf record' [-e <EVENT> | --event=EVENT] [-l] [-a] -- <command> [<options>]
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DESCRIPTION
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-----------
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This command runs a command and gathers a performance counter profile
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from it, into perf.data - without displaying anything.
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This file can then be inspected later on, using 'perf report'.
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OPTIONS
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-------
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<command>...::
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Any command you can specify in a shell.
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-e::
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--event=::
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Select the PMU event. Selection can be:
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- a symbolic event name (use 'perf list' to list all events)
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- a raw PMU event (eventsel+umask) in the form of rNNN where NNN is a
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hexadecimal event descriptor.
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- a hardware breakpoint event in the form of '\mem:addr[:access]'
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where addr is the address in memory you want to break in.
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Access is the memory access type (read, write, execute) it can
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be passed as follows: '\mem:addr[:[r][w][x]]'.
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If you want to profile read-write accesses in 0x1000, just set
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'mem:0x1000:rw'.
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--filter=<filter>::
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Event filter.
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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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-l::
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Scale counter values.
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-p::
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--pid=::
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Record events on existing process ID.
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-t::
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--tid=::
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Record events on existing thread ID.
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-r::
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--realtime=::
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Collect data with this RT SCHED_FIFO priority.
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perf record: Add "nodelay" mode, disabled by default
Sometimes there is a need to use perf in "live-log" mode. The problem
is, for seldom events, actual info output is largely delayed because
perf-record reads sample data in whole pages.
So for such scenarious, add flag for perf-record to go in "nodelay"
mode. To track e.g. what's going on in icmp_rcv while ping is running
Use it with something like this:
(1) $ perf probe -L icmp_rcv | grep -U8 '^ *43\>'
goto error;
}
38 if (!pskb_pull(skb, sizeof(*icmph)))
goto error;
icmph = icmp_hdr(skb);
43 ICMPMSGIN_INC_STATS_BH(net, icmph->type);
/*
* 18 is the highest 'known' ICMP type. Anything else is a mystery
*
* RFC 1122: 3.2.2 Unknown ICMP messages types MUST be silently
* discarded.
*/
50 if (icmph->type > NR_ICMP_TYPES)
goto error;
$ perf probe icmp_rcv:43 'type=icmph->type'
(2) $ cat trace-icmp.py
[...]
def trace_begin():
print "in trace_begin"
def trace_end():
print "in trace_end"
def probe__icmp_rcv(event_name, context, common_cpu,
common_secs, common_nsecs, common_pid, common_comm,
__probe_ip, type):
print_header(event_name, common_cpu, common_secs, common_nsecs,
common_pid, common_comm)
print "__probe_ip=%u, type=%u\n" % \
(__probe_ip, type),
[...]
(3) $ perf record -a -D -e probe:icmp_rcv -o - | \
perf script -i - -s trace-icmp.py
Thanks to Peter Zijlstra for pointing how to do it.
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Ingo Molnar <mingo@elte.hu>, Mike Galbraith <efault@gmx.de>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Stephane Eranian <eranian@google.com>
Cc: Tom Zanussi <tzanussi@gmail.com>
LKML-Reference: <20110112140613.GA11698@tugrik.mns.mnsspb.ru>
Signed-off-by: Kirill Smelkov <kirr@mns.spb.ru>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
14 years ago
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-D::
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--no-delay::
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Collect data without buffering.
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-A::
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--append::
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Append to the output file to do incremental profiling.
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-f::
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--force::
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Overwrite existing data file. (deprecated)
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-c::
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--count=::
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Event period to sample.
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-o::
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--output=::
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Output file name.
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-i::
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--no-inherit::
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Child tasks do not inherit counters.
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-F::
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--freq=::
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Profile at this frequency.
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-m::
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--mmap-pages=::
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Number of mmap data pages.
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-g::
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--call-graph::
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Do call-graph (stack chain/backtrace) recording.
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-q::
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--quiet::
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Don't print any message, useful for scripting.
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-v::
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--verbose::
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Be more verbose (show counter open errors, etc).
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-s::
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--stat::
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Per thread counts.
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-d::
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--data::
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Sample addresses.
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-T::
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--timestamp::
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Sample timestamps. Use it with 'perf report -D' to see the timestamps,
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for instance.
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-n::
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--no-samples::
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Don't sample.
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-R::
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--raw-samples::
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Collect raw sample records from all opened counters (default for tracepoint counters).
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-C::
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--cpu::
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Collect samples only on the list of CPUs provided. Multiple CPUs can be provided as a
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comma-separated list with no space: 0,1. Ranges of CPUs are specified with -: 0-2.
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In per-thread mode with inheritance mode on (default), samples are captured only when
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the thread executes on the designated CPUs. Default is to monitor all CPUs.
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-N::
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--no-buildid-cache::
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Do not update the builid cache. This saves some overhead in situations
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where the information in the perf.data file (which includes buildids)
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is sufficient.
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perf tool: Add cgroup support
This patch adds the ability to filter monitoring based on container groups
(cgroups) for both perf stat and perf record. It is possible to monitor
multiple cgroup in parallel. There is one cgroup per event. The cgroups to
monitor are passed via a new -G option followed by a comma separated list of
cgroup names.
The cgroup filesystem has to be mounted. Given a cgroup name, the perf tool
finds the corresponding directory in the cgroup filesystem and opens it. It
then passes that file descriptor to the kernel.
Example:
$ perf stat -B -a -e cycles:u,cycles:u,cycles:u -G test1,,test2 -- sleep 1
Performance counter stats for 'sleep 1':
2,368,667,414 cycles test1
2,369,661,459 cycles
<not counted> cycles test2
1.001856890 seconds time elapsed
Signed-off-by: Stephane Eranian <eranian@google.com>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
LKML-Reference: <4d590290.825bdf0a.7d0a.4890@mx.google.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
14 years ago
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-G name,...::
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--cgroup name,...::
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monitor only in the container (cgroup) called "name". This option is available only
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in per-cpu mode. The cgroup filesystem must be mounted. All threads belonging to
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container "name" are monitored when they run on the monitored CPUs. Multiple cgroups
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can be provided. Each cgroup is applied to the corresponding event, i.e., first cgroup
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to first event, second cgroup to second event and so on. It is possible to provide
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an empty cgroup (monitor all the time) using, e.g., -G foo,,bar. Cgroups must have
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corresponding events, i.e., they always refer to events defined earlier on the command
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line.
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SEE ALSO
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--------
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linkperf:perf-stat[1], linkperf:perf-list[1]
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