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| author | Andi Kleen <ak@linux.intel.com> | 2015-12-11 16:12:24 -0800 |
|---|---|---|
| committer | Arnaldo Carvalho de Melo <acme@redhat.com> | 2015-12-14 12:11:22 -0300 |
| commit | bd0f889536f80630c1c4a414f2de90744d2c87d0 (patch) | |
| tree | 28c212dd96811729c10a68c6c216d0cdf8b94aa0 /tools/build | |
| parent | abd828688407eb86044f1bc9e5133c55d7597596 (diff) | |
| download | linux-bd0f889536f80630c1c4a414f2de90744d2c87d0.tar.bz2 | |
perf evsel: Disable branch flags/cycles for --callgraph lbr
[The kernel patch needed for this is in tip now (b16a5b52eb9 perf/x86:
Add option to disable ...) So this user tools patch to make use of it
should be merged now]
Automatically disable collecting branch flags and cycles with
--call-graph lbr. This allows avoiding a bunch of extra MSR
reads in the PMI on Skylake.
When the kernel doesn't support the new flags they are automatically
cleared in the fallback code.
v2: Switch to use branch_sample_type instead of sample_type.
Adjust description.
Fix the fallback logic.
Signed-off-by: Andi Kleen <ak@linux.intel.com>
Acked-by: Jiri Olsa <jolsa@kernel.org>
Link: http://lkml.kernel.org/r/1449879144-29074-1-git-send-email-andi@firstfloor.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Diffstat (limited to 'tools/build')
0 files changed, 0 insertions, 0 deletions