2009-04-20 21:58:01 +08:00
|
|
|
perf-record(1)
|
2009-05-30 18:38:51 +08:00
|
|
|
==============
|
2009-04-20 21:58:01 +08:00
|
|
|
|
|
|
|
NAME
|
|
|
|
----
|
2009-05-27 15:33:18 +08:00
|
|
|
perf-record - Run a command and record its profile into perf.data
|
2009-04-20 21:58:01 +08:00
|
|
|
|
|
|
|
SYNOPSIS
|
|
|
|
--------
|
|
|
|
[verse]
|
|
|
|
'perf record' [-e <EVENT> | --event=EVENT] [-l] [-a] <command>
|
2009-05-28 22:25:34 +08:00
|
|
|
'perf record' [-e <EVENT> | --event=EVENT] [-l] [-a] -- <command> [<options>]
|
2009-04-20 21:58:01 +08:00
|
|
|
|
|
|
|
DESCRIPTION
|
|
|
|
-----------
|
|
|
|
This command runs a command and gathers a performance counter profile
|
2009-05-27 15:33:18 +08:00
|
|
|
from it, into perf.data - without displaying anything.
|
2009-04-20 21:58:01 +08:00
|
|
|
|
|
|
|
This file can then be inspected later on, using 'perf report'.
|
|
|
|
|
|
|
|
|
|
|
|
OPTIONS
|
|
|
|
-------
|
|
|
|
<command>...::
|
|
|
|
Any command you can specify in a shell.
|
|
|
|
|
|
|
|
-e::
|
|
|
|
--event=::
|
2009-11-23 22:42:35 +08:00
|
|
|
Select the PMU event. Selection can be:
|
2009-04-20 21:58:01 +08:00
|
|
|
|
2009-11-23 22:42:35 +08:00
|
|
|
- a symbolic event name (use 'perf list' to list all events)
|
|
|
|
|
|
|
|
- a raw PMU event (eventsel+umask) in the form of rNNN where NNN is a
|
|
|
|
hexadecimal event descriptor.
|
|
|
|
|
2015-01-08 09:13:53 +08:00
|
|
|
- a symbolically formed PMU event like 'pmu/param1=0x3,param2/' where
|
|
|
|
'param1', 'param2', etc are defined as formats for the PMU in
|
|
|
|
/sys/bus/event_sources/devices/<pmu>/format/*.
|
|
|
|
|
|
|
|
- a symbolically formed event like 'pmu/config=M,config1=N,config3=K/'
|
|
|
|
|
|
|
|
where M, N, K are numbers (in decimal, hex, octal format). Acceptable
|
|
|
|
values for each of 'config', 'config1' and 'config2' are defined by
|
|
|
|
corresponding entries in /sys/bus/event_sources/devices/<pmu>/format/*
|
|
|
|
param1 and param2 are defined as formats for the PMU in:
|
|
|
|
/sys/bus/event_sources/devices/<pmu>/format/*
|
|
|
|
|
2015-07-08 16:44:54 +08:00
|
|
|
There are also some params which are not defined in .../<pmu>/format/*.
|
2015-07-29 17:42:11 +08:00
|
|
|
These params can be used to overload default config values per event.
|
2015-07-08 16:44:54 +08:00
|
|
|
Here is a list of the params.
|
|
|
|
- 'period': Set event sampling period
|
2015-08-09 14:45:23 +08:00
|
|
|
- 'freq': Set event sampling frequency
|
2015-08-04 16:30:19 +08:00
|
|
|
- 'time': Disable/enable time stamping. Acceptable values are 1 for
|
|
|
|
enabling time stamping. 0 for disabling time stamping.
|
|
|
|
The default is 1.
|
perf callchain: Per-event type selection support
This patchkit adds the ability to set callgraph mode (fp, dwarf, lbr) per
event. This in term can reduce sampling overhead and the size of the
perf.data.
Here is an example.
perf record -e 'cpu/cpu-cycles,period=1000,call-graph=fp,time=1/,cpu/instructions,call-graph=lbr/' sleep 1
perf evlist -v
cpu/cpu-cycles,period=1000,call-graph=fp,time=1/: type: 4, size: 112,
config: 0x3c, { sample_period, sample_freq }: 1000, sample_type:
IP|TID|TIME|CALLCHAIN|PERIOD|IDENTIFIER, read_format: ID, disabled: 1,
inherit: 1, mmap: 1, comm: 1, enable_on_exec: 1, task: 1, sample_id_all:
1, exclude_guest: 1, mmap2: 1, comm_exec: 1
cpu/instructions,call-graph=lbr/: type: 4, size: 112, config: 0xc0, {
sample_period, sample_freq }: 4000, sample_type:
IP|TID|TIME|CALLCHAIN|PERIOD|BRANCH_STACK|IDENTIFIER, read_format: ID,
disabled: 1, inherit: 1, freq: 1, enable_on_exec: 1, sample_id_all: 1,
exclude_guest: 1
Signed-off-by: Kan Liang <kan.liang@intel.com>
Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Link: http://lkml.kernel.org/r/1439289050-40510-1-git-send-email-kan.liang@intel.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
2015-08-11 18:30:47 +08:00
|
|
|
- 'call-graph': Disable/enable callgraph. Acceptable str are "fp" for
|
2015-08-11 18:30:48 +08:00
|
|
|
FP mode, "dwarf" for DWARF mode, "lbr" for LBR mode and
|
|
|
|
"no" for disable callgraph.
|
perf callchain: Per-event type selection support
This patchkit adds the ability to set callgraph mode (fp, dwarf, lbr) per
event. This in term can reduce sampling overhead and the size of the
perf.data.
Here is an example.
perf record -e 'cpu/cpu-cycles,period=1000,call-graph=fp,time=1/,cpu/instructions,call-graph=lbr/' sleep 1
perf evlist -v
cpu/cpu-cycles,period=1000,call-graph=fp,time=1/: type: 4, size: 112,
config: 0x3c, { sample_period, sample_freq }: 1000, sample_type:
IP|TID|TIME|CALLCHAIN|PERIOD|IDENTIFIER, read_format: ID, disabled: 1,
inherit: 1, mmap: 1, comm: 1, enable_on_exec: 1, task: 1, sample_id_all:
1, exclude_guest: 1, mmap2: 1, comm_exec: 1
cpu/instructions,call-graph=lbr/: type: 4, size: 112, config: 0xc0, {
sample_period, sample_freq }: 4000, sample_type:
IP|TID|TIME|CALLCHAIN|PERIOD|BRANCH_STACK|IDENTIFIER, read_format: ID,
disabled: 1, inherit: 1, freq: 1, enable_on_exec: 1, sample_id_all: 1,
exclude_guest: 1
Signed-off-by: Kan Liang <kan.liang@intel.com>
Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Link: http://lkml.kernel.org/r/1439289050-40510-1-git-send-email-kan.liang@intel.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
2015-08-11 18:30:47 +08:00
|
|
|
- 'stack-size': user stack size for dwarf mode
|
2015-07-08 16:44:54 +08:00
|
|
|
Note: If user explicitly sets options which conflict with the params,
|
|
|
|
the value set by the params will be overridden.
|
|
|
|
|
2014-05-29 23:26:51 +08:00
|
|
|
- a hardware breakpoint event in the form of '\mem:addr[/len][:access]'
|
2009-11-23 22:42:35 +08:00
|
|
|
where addr is the address in memory you want to break in.
|
|
|
|
Access is the memory access type (read, write, execute) it can
|
2014-05-29 23:26:51 +08:00
|
|
|
be passed as follows: '\mem:addr[:[r][w][x]]'. len is the range,
|
|
|
|
number of bytes from specified addr, which the breakpoint will cover.
|
2009-11-23 22:42:35 +08:00
|
|
|
If you want to profile read-write accesses in 0x1000, just set
|
|
|
|
'mem:0x1000:rw'.
|
2014-05-29 23:26:51 +08:00
|
|
|
If you want to profile write accesses in [0x1000~1008), just set
|
|
|
|
'mem:0x1000/8:w'.
|
2010-12-01 09:57:16 +08:00
|
|
|
|
2015-03-02 11:13:33 +08:00
|
|
|
- a group of events surrounded by a pair of brace ("{event1,event2,...}").
|
|
|
|
Each event is separated by commas and the group should be quoted to
|
|
|
|
prevent the shell interpretation. You also need to use --group on
|
|
|
|
"perf report" to view group events together.
|
|
|
|
|
2010-12-01 09:57:16 +08:00
|
|
|
--filter=<filter>::
|
2015-07-10 15:36:10 +08:00
|
|
|
Event filter. This option should follow a event selector (-e) which
|
|
|
|
selects tracepoint event(s). Multiple '--filter' options are combined
|
|
|
|
using '&&'.
|
|
|
|
|
|
|
|
--exclude-perf::
|
|
|
|
Don't record events issued by perf itself. This option should follow
|
|
|
|
a event selector (-e) which selects tracepoint event(s). It adds a
|
|
|
|
filter expression 'common_pid != $PERFPID' to filters. If other
|
|
|
|
'--filter' exists, the new filter expression will be combined with
|
|
|
|
them by '&&'.
|
2010-12-01 09:57:16 +08:00
|
|
|
|
2009-04-20 21:58:01 +08:00
|
|
|
-a::
|
2010-12-01 09:57:16 +08:00
|
|
|
--all-cpus::
|
|
|
|
System-wide collection from all CPUs.
|
2009-04-20 21:58:01 +08:00
|
|
|
|
2009-08-05 21:04:53 +08:00
|
|
|
-p::
|
|
|
|
--pid=::
|
2012-02-09 00:32:52 +08:00
|
|
|
Record events on existing process ID (comma separated list).
|
2010-12-01 09:57:16 +08:00
|
|
|
|
|
|
|
-t::
|
|
|
|
--tid=::
|
2012-02-09 00:32:52 +08:00
|
|
|
Record events on existing thread ID (comma separated list).
|
2013-11-18 17:55:57 +08:00
|
|
|
This option also disables inheritance by default. Enable it by adding
|
|
|
|
--inherit.
|
2009-08-05 21:04:53 +08:00
|
|
|
|
2012-01-20 00:08:15 +08:00
|
|
|
-u::
|
|
|
|
--uid=::
|
|
|
|
Record events in threads owned by uid. Name or number.
|
|
|
|
|
2009-08-05 21:04:53 +08:00
|
|
|
-r::
|
|
|
|
--realtime=::
|
|
|
|
Collect data with this RT SCHED_FIFO priority.
|
2013-06-05 19:35:06 +08:00
|
|
|
|
2014-01-15 04:52:14 +08:00
|
|
|
--no-buffering::
|
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>
2011-01-12 22:59:36 +08:00
|
|
|
Collect data without buffering.
|
2009-08-05 21:04:53 +08:00
|
|
|
|
|
|
|
-c::
|
|
|
|
--count=::
|
|
|
|
Event period to sample.
|
|
|
|
|
|
|
|
-o::
|
|
|
|
--output=::
|
|
|
|
Output file name.
|
|
|
|
|
|
|
|
-i::
|
2010-05-12 16:40:01 +08:00
|
|
|
--no-inherit::
|
|
|
|
Child tasks do not inherit counters.
|
2009-08-05 21:04:53 +08:00
|
|
|
-F::
|
|
|
|
--freq=::
|
|
|
|
Profile at this frequency.
|
|
|
|
|
|
|
|
-m::
|
|
|
|
--mmap-pages=::
|
2013-09-01 18:36:13 +08:00
|
|
|
Number of mmap data pages (must be a power of two) or size
|
|
|
|
specification with appended unit character - B/K/M/G. The
|
|
|
|
size is rounded up to have nearest pages power of two value.
|
2015-04-09 23:53:46 +08:00
|
|
|
Also, by adding a comma, the number of mmap pages for AUX
|
|
|
|
area tracing can be specified.
|
2009-08-05 21:04:53 +08:00
|
|
|
|
2015-03-02 11:13:33 +08:00
|
|
|
--group::
|
|
|
|
Put all events in a single event group. This precedes the --event
|
|
|
|
option and remains only for backward compatibility. See --event.
|
|
|
|
|
2009-08-05 21:04:53 +08:00
|
|
|
-g::
|
2013-10-26 22:25:33 +08:00
|
|
|
Enables call-graph (stack chain/backtrace) recording.
|
|
|
|
|
2009-08-05 21:04:53 +08:00
|
|
|
--call-graph::
|
2013-10-26 22:25:33 +08:00
|
|
|
Setup and enable call-graph (stack chain/backtrace) recording,
|
|
|
|
implies -g.
|
|
|
|
|
|
|
|
Allows specifying "fp" (frame pointer) or "dwarf"
|
2015-01-06 02:23:04 +08:00
|
|
|
(DWARF's CFI - Call Frame Information) or "lbr"
|
|
|
|
(Hardware Last Branch Record facility) as the method to collect
|
2013-10-26 22:25:33 +08:00
|
|
|
the information used to show the call graphs.
|
|
|
|
|
|
|
|
In some systems, where binaries are build with gcc
|
|
|
|
--fomit-frame-pointer, using the "fp" method will produce bogus
|
|
|
|
call graphs, using "dwarf", if available (perf tools linked to
|
|
|
|
the libunwind library) should be used instead.
|
2015-01-06 02:23:04 +08:00
|
|
|
Using the "lbr" method doesn't require any compiler options. It
|
|
|
|
will produce call graphs from the hardware LBR registers. The
|
|
|
|
main limition is that it is only available on new Intel
|
|
|
|
platforms, such as Haswell. It can only get user call chain. It
|
|
|
|
doesn't work with branch stack sampling at the same time.
|
2009-08-05 21:04:53 +08:00
|
|
|
|
2010-10-27 01:20:09 +08:00
|
|
|
-q::
|
|
|
|
--quiet::
|
|
|
|
Don't print any message, useful for scripting.
|
|
|
|
|
2009-08-05 21:04:53 +08:00
|
|
|
-v::
|
|
|
|
--verbose::
|
|
|
|
Be more verbose (show counter open errors, etc).
|
|
|
|
|
|
|
|
-s::
|
|
|
|
--stat::
|
2015-05-09 23:19:42 +08:00
|
|
|
Record per-thread event counts. Use it with 'perf report -T' to see
|
|
|
|
the values.
|
2009-08-05 21:04:53 +08:00
|
|
|
|
|
|
|
-d::
|
|
|
|
--data::
|
2015-06-10 22:48:50 +08:00
|
|
|
Record the sample addresses.
|
2009-08-05 21:04:53 +08:00
|
|
|
|
2010-12-02 20:25:28 +08:00
|
|
|
-T::
|
|
|
|
--timestamp::
|
2015-06-10 22:48:50 +08:00
|
|
|
Record the sample timestamps. Use it with 'perf report -D' to see the
|
|
|
|
timestamps, for instance.
|
|
|
|
|
|
|
|
-P::
|
|
|
|
--period::
|
|
|
|
Record the sample period.
|
2010-12-02 20:25:28 +08:00
|
|
|
|
2009-08-05 21:04:53 +08:00
|
|
|
-n::
|
|
|
|
--no-samples::
|
|
|
|
Don't sample.
|
2009-04-20 21:58:01 +08:00
|
|
|
|
2009-08-31 09:32:03 +08:00
|
|
|
-R::
|
|
|
|
--raw-samples::
|
2010-04-15 02:05:17 +08:00
|
|
|
Collect raw sample records from all opened counters (default for tracepoint counters).
|
2009-08-31 09:32:03 +08:00
|
|
|
|
2010-05-28 18:00:01 +08:00
|
|
|
-C::
|
|
|
|
--cpu::
|
2010-12-01 09:57:16 +08:00
|
|
|
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.
|
2010-05-28 18:00:01 +08:00
|
|
|
In per-thread mode with inheritance mode on (default), samples are captured only when
|
|
|
|
the thread executes on the designated CPUs. Default is to monitor all CPUs.
|
|
|
|
|
2010-06-17 17:39:01 +08:00
|
|
|
-N::
|
|
|
|
--no-buildid-cache::
|
2014-09-09 23:18:50 +08:00
|
|
|
Do not update the buildid cache. This saves some overhead in situations
|
2010-06-17 17:39:01 +08:00
|
|
|
where the information in the perf.data file (which includes buildids)
|
|
|
|
is sufficient.
|
|
|
|
|
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>
2011-02-14 17:20:01 +08:00
|
|
|
-G name,...::
|
|
|
|
--cgroup name,...::
|
|
|
|
monitor only in the container (cgroup) called "name". This option is available only
|
|
|
|
in per-cpu mode. The cgroup filesystem must be mounted. All threads belonging to
|
|
|
|
container "name" are monitored when they run on the monitored CPUs. Multiple cgroups
|
|
|
|
can be provided. Each cgroup is applied to the corresponding event, i.e., first cgroup
|
|
|
|
to first event, second cgroup to second event and so on. It is possible to provide
|
|
|
|
an empty cgroup (monitor all the time) using, e.g., -G foo,,bar. Cgroups must have
|
|
|
|
corresponding events, i.e., they always refer to events defined earlier on the command
|
|
|
|
line.
|
|
|
|
|
2012-02-10 06:21:02 +08:00
|
|
|
-b::
|
2012-03-09 06:47:45 +08:00
|
|
|
--branch-any::
|
|
|
|
Enable taken branch stack sampling. Any type of taken branch may be sampled.
|
|
|
|
This is a shortcut for --branch-filter any. See --branch-filter for more infos.
|
|
|
|
|
|
|
|
-j::
|
|
|
|
--branch-filter::
|
2012-02-10 06:21:02 +08:00
|
|
|
Enable taken branch stack sampling. Each sample captures a series of consecutive
|
|
|
|
taken branches. The number of branches captured with each sample depends on the
|
|
|
|
underlying hardware, the type of branches of interest, and the executed code.
|
|
|
|
It is possible to select the types of branches captured by enabling filters. The
|
|
|
|
following filters are defined:
|
|
|
|
|
2012-03-09 06:47:45 +08:00
|
|
|
- any: any type of branches
|
2012-02-10 06:21:02 +08:00
|
|
|
- any_call: any function call or system call
|
|
|
|
- any_ret: any function return or system call return
|
2012-05-18 16:46:50 +08:00
|
|
|
- ind_call: any indirect branch
|
2012-02-10 06:21:02 +08:00
|
|
|
- u: only when the branch target is at the user level
|
|
|
|
- k: only when the branch target is in the kernel
|
|
|
|
- hv: only when the target is at the hypervisor level
|
2013-09-20 22:40:42 +08:00
|
|
|
- in_tx: only when the target is in a hardware transaction
|
|
|
|
- no_tx: only when the target is not in a hardware transaction
|
|
|
|
- abort_tx: only when the target is a hardware transaction abort
|
2014-05-22 15:20:10 +08:00
|
|
|
- cond: conditional branches
|
2012-02-10 06:21:02 +08:00
|
|
|
|
|
|
|
+
|
2014-05-22 15:20:10 +08:00
|
|
|
The option requires at least one branch type among any, any_call, any_ret, ind_call, cond.
|
2012-11-30 13:10:25 +08:00
|
|
|
The privilege levels may be omitted, in which case, the privilege levels of the associated
|
2012-03-09 06:47:45 +08:00
|
|
|
event are applied to the branch filter. Both kernel (k) and hypervisor (hv) privilege
|
|
|
|
levels are subject to permissions. When sampling on multiple events, branch stack sampling
|
|
|
|
is enabled for all the sampling events. The sampled branch type is the same for all events.
|
|
|
|
The various filters must be specified as a comma separated list: --branch-filter any_ret,u,k
|
|
|
|
Note that this feature may not be available on all processors.
|
2012-02-10 06:21:02 +08:00
|
|
|
|
2013-01-24 23:10:29 +08:00
|
|
|
--weight::
|
|
|
|
Enable weightened sampling. An additional weight is recorded per sample and can be
|
|
|
|
displayed with the weight and local_weight sort keys. This currently works for TSX
|
|
|
|
abort events and some memory events in precise mode on modern Intel CPUs.
|
|
|
|
|
2013-09-20 22:40:43 +08:00
|
|
|
--transaction::
|
|
|
|
Record transaction flags for transaction related events.
|
|
|
|
|
2013-11-15 21:52:29 +08:00
|
|
|
--per-thread::
|
|
|
|
Use per-thread mmaps. By default per-cpu mmaps are created. This option
|
|
|
|
overrides that and uses per-thread mmaps. A side-effect of that is that
|
|
|
|
inheritance is automatically disabled. --per-thread is ignored with a warning
|
|
|
|
if combined with -a or -C options.
|
2013-11-01 21:51:34 +08:00
|
|
|
|
2014-01-15 04:58:12 +08:00
|
|
|
-D::
|
|
|
|
--delay=::
|
2014-01-12 05:38:27 +08:00
|
|
|
After starting the program, wait msecs before measuring. This is useful to
|
|
|
|
filter out the startup phase of the program, which is often very different.
|
|
|
|
|
2014-09-24 19:48:41 +08:00
|
|
|
-I::
|
|
|
|
--intr-regs::
|
|
|
|
Capture machine state (registers) at interrupt, i.e., on counter overflows for
|
|
|
|
each sample. List of captured registers depends on the architecture. This option
|
|
|
|
is off by default.
|
|
|
|
|
2015-02-25 07:13:40 +08:00
|
|
|
--running-time::
|
|
|
|
Record running and enabled time for read events (:S)
|
|
|
|
|
2015-03-31 06:19:31 +08:00
|
|
|
-k::
|
|
|
|
--clockid::
|
|
|
|
Sets the clock id to use for the various time fields in the perf_event_type
|
|
|
|
records. See clock_gettime(). In particular CLOCK_MONOTONIC and
|
|
|
|
CLOCK_MONOTONIC_RAW are supported, some events might also allow
|
|
|
|
CLOCK_BOOTTIME, CLOCK_REALTIME and CLOCK_TAI.
|
|
|
|
|
2015-04-30 22:37:32 +08:00
|
|
|
-S::
|
|
|
|
--snapshot::
|
|
|
|
Select AUX area tracing Snapshot Mode. This option is valid only with an
|
|
|
|
AUX area tracing event. Optionally the number of bytes to capture per
|
|
|
|
snapshot can be specified. In Snapshot Mode, trace data is captured only when
|
|
|
|
signal SIGUSR2 is received.
|
|
|
|
|
2015-06-17 21:51:11 +08:00
|
|
|
--proc-map-timeout::
|
|
|
|
When processing pre-existing threads /proc/XXX/mmap, it may take a long time,
|
|
|
|
because the file may be huge. A time out is needed in such cases.
|
|
|
|
This option sets the time out limit. The default value is 500 ms.
|
|
|
|
|
2015-07-21 17:44:04 +08:00
|
|
|
--switch-events::
|
|
|
|
Record context switch events i.e. events of type PERF_RECORD_SWITCH or
|
|
|
|
PERF_RECORD_SWITCH_CPU_WIDE.
|
|
|
|
|
2009-04-20 21:58:01 +08:00
|
|
|
SEE ALSO
|
|
|
|
--------
|
2009-06-06 20:56:33 +08:00
|
|
|
linkperf:perf-stat[1], linkperf:perf-list[1]
|