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| author | Stephane Eranian <eranian@google.com> | 2010-06-17 11:39:01 +0200 |
|---|---|---|
| committer | Arnaldo Carvalho de Melo <acme@redhat.com> | 2010-06-17 10:20:44 -0300 |
| commit | a1ac1d3c085420ea8c809ebbee3bb212ed3616bd (patch) | |
| tree | aca14b46e24f277fe7601457039ef5e5ef1421f9 /tools/perf/Documentation | |
| parent | 70c3856b2f1304e0abc65f1b96a8c60ddfc0fb9e (diff) | |
| download | kernel_samsung_smdk4412-a1ac1d3c085420ea8c809ebbee3bb212ed3616bd.zip kernel_samsung_smdk4412-a1ac1d3c085420ea8c809ebbee3bb212ed3616bd.tar.gz kernel_samsung_smdk4412-a1ac1d3c085420ea8c809ebbee3bb212ed3616bd.tar.bz2 | |
perf record: Add option to avoid updating buildid cache
There are situations where there is enough information in the perf.data
to process the samples. Updating the buildid cache may add unecessary
overhead in terms of disk space and time (copying large elf images).
A persistent option to do this already exists via the perfconfig file,
simply do:
[buildid]
dir = /dev/null
This patch provides a way to suppress builid cache updates on a per-run
basis. It addds a new option, -N, to perf record. Buildids are still
generated in the perf.data file.
Cc: David S. Miller <davem@davemloft.net>
Cc: Frédéric Weisbecker <fweisbec@gmail.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <peterz@infradead.org>
LKML-Reference: <4c19ef89.93ecd80a.40dc.fffff8e9@mx.google.com>
Signed-off-by: Stephane Eranian <eranian@google.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 | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/tools/perf/Documentation/perf-record.txt b/tools/perf/Documentation/perf-record.txt index 25576b4..3ee27dc 100644 --- a/tools/perf/Documentation/perf-record.txt +++ b/tools/perf/Documentation/perf-record.txt @@ -110,6 +110,12 @@ comma-sperated list with no space: 0,1. Ranges of CPUs are specified with -: 0-2 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. +-N:: +--no-buildid-cache:: +Do not update the builid cache. This saves some overhead in situations +where the information in the perf.data file (which includes buildids) +is sufficient. + SEE ALSO -------- linkperf:perf-stat[1], linkperf:perf-list[1] |