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| author | weiping zhang <zhangweiping@didichuxing.com> | 2018-01-29 23:48:09 +0800 |
|---|---|---|
| committer | Arnaldo Carvalho de Melo <acme@redhat.com> | 2018-02-22 10:02:27 -0300 |
| commit | 25f72f9ed88d5be86c92432fc779e2725e3506cd (patch) | |
| tree | 97b9783973c77b0d7cf37ecef6bc1f84c3056bea /tools/perf/Documentation/perf-record.txt | |
| parent | 42811d509d6e0b0118918ce6be346be54d8e8801 (diff) | |
| download | linux-25f72f9ed88d5be86c92432fc779e2725e3506cd.tar.gz linux-25f72f9ed88d5be86c92432fc779e2725e3506cd.tar.bz2 linux-25f72f9ed88d5be86c92432fc779e2725e3506cd.zip | |
perf cgroup: Simplify arguments when tracking multiple events
When using -G with one cgroup and -e with multiple events, only the
first event gets the correct cgroup setting, all events from the second
onwards will track system-wide events.
If the user wants to track multiple events for a specific cgroup, the
user must give parameters like the following:
$ perf stat -e e1 -e e2 -e e3 -G test,test,test
This patch simplify this case, just type one cgroup:
$ perf stat -e e1 -e e2 -e e3 -G test
$ mkdir -p /sys/fs/cgroup/perf_event/empty_cgroup
$ perf stat -e cycles -e cache-misses -a -I 1000 -G empty_cgroup
Before:
1.001007226 <not counted> cycles empty_cgroup
1.001007226 7,506 cache-misses
After:
1.000834097 <not counted> cycles empty_cgroup
1.000834097 <not counted> cache-misses empty_cgroup
Signed-off-by: weiping zhang <zhangweiping@didichuxing.com>
Acked-by: Jiri Olsa <jolsa@kernel.org>
Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/20180129154805.GA6284@localhost.didichuxing.com
[ Improved the doc text a bit, providing an example for cgroup + system wide counting ]
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Diffstat (limited to 'tools/perf/Documentation/perf-record.txt')
| -rw-r--r-- | tools/perf/Documentation/perf-record.txt | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/tools/perf/Documentation/perf-record.txt b/tools/perf/Documentation/perf-record.txt index 3eea6de35a38..76bc2181d214 100644 --- a/tools/perf/Documentation/perf-record.txt +++ b/tools/perf/Documentation/perf-record.txt @@ -308,7 +308,11 @@ can be provided. Each cgroup is applied to the corresponding event, i.e., first 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. +line. If the user wants to track multiple events for a specific cgroup, the user can +use '-e e1 -e e2 -G foo,foo' or just use '-e e1 -e e2 -G foo'. + +If wanting to monitor, say, 'cycles' for a cgroup and also for system wide, this +command line can be used: 'perf stat -e cycles -G cgroup_name -a -e cycles'. -b:: --branch-any:: |