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| author | Stephane Eranian <eranian@google.com> | 2020-11-26 20:09:22 +0900 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2020-12-30 11:50:57 +0100 |
| commit | a803ea15b0dca8f073b3d5139b962a0a93354e00 (patch) | |
| tree | 9e2426e5d41fbab3442fe2ad9319d3e28110d674 /scripts | |
| parent | 12db619c91d78d3db7e8cd05147108ed1eaa4783 (diff) | |
perf/x86/intel: Check PEBS status correctly
[ Upstream commit fc17db8aa4c53cbd2d5469bb0521ea0f0a6dbb27 ]
The kernel cannot disambiguate when 2+ PEBS counters overflow at the
same time. This is what the comment for this code suggests. However,
I see the comparison is done with the unfiltered p->status which is a
copy of IA32_PERF_GLOBAL_STATUS at the time of the sample. This
register contains more than the PEBS counter overflow bits. It also
includes many other bits which could also be set.
Signed-off-by: Namhyung Kim <namhyung@kernel.org>
Signed-off-by: Stephane Eranian <eranian@google.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lkml.kernel.org/r/20201126110922.317681-2-namhyung@kernel.org
Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'scripts')
0 files changed, 0 insertions, 0 deletions