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author | Jiri Olsa <jolsa@kernel.org> | 2015-07-29 09:42:11 (GMT) |
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committer | Arnaldo Carvalho de Melo <acme@redhat.com> | 2015-07-29 19:18:21 (GMT) |
commit | ee4c75887d12bcd6ecd897291797d969256f39ca (patch) | |
tree | 9615b63684b35e15608bc2f4d0515a6b28203d8f /tools/perf/Documentation | |
parent | 930a2e29758f865e3a7b34b8b3b37c08d40f0254 (diff) | |
download | linux-ee4c75887d12bcd6ecd897291797d969256f39ca.tar.xz |
perf tools: Force period term to overload global settings
Currently the command line option settings beats the per event period
settings:
With no global settings, we get per-event configuration:
$ perf record -e 'cpu/instructions,period=20000/' sleep 1
$ perf evlist -v
... { sample_period, sample_freq }: 20000 ...
With 'c' option period setup, we get 'c' option value:
$ perf record -e 'cpu/instructions,period=20000/' -c 1000 sleep 1
$ perf evlist -v
... { sample_period, sample_freq }: 1000 ...
This patch makes the per-event settings overload the global 'c' option
setup:
$ perf record -e 'cpu/instructions,period=20000/' -c 1000 sleep 1
$ perf evlist -v
... { sample_period, sample_freq }: 20000 ...
I think the making the per-event settings to overload any other config
makes more sense than current state. However it breaks the current
'period' term handling, which might cause some noise.. so let's see ;-).
Also fixing parse event tests with the new behaviour.
Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Kan Liang <kan.liang@intel.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Link: http://lkml.kernel.org/r/1438162936-59698-3-git-send-email-kan.liang@intel.com
Signed-off-by: Kan Liang <kan.liang@intel.com>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Diffstat (limited to 'tools/perf/Documentation')
-rw-r--r-- | tools/perf/Documentation/perf-record.txt | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/tools/perf/Documentation/perf-record.txt b/tools/perf/Documentation/perf-record.txt index 63ee040..ac41350 100644 --- a/tools/perf/Documentation/perf-record.txt +++ b/tools/perf/Documentation/perf-record.txt @@ -46,7 +46,7 @@ OPTIONS /sys/bus/event_sources/devices/<pmu>/format/* There are also some params which are not defined in .../<pmu>/format/*. - These params can be used to set event defaults. + These params can be used to overload default config values per event. Here is a list of the params. - 'period': Set event sampling period |