diff options
| author | Kan Liang <kan.liang@linux.intel.com> | 2022-03-28 18:49:02 +0300 |
|---|---|---|
| committer | Peter Zijlstra <peterz@infradead.org> | 2022-04-05 10:59:44 +0300 |
| commit | 4a263bf331c512849062805ef1b4ac40301a9829 (patch) | |
| tree | 36e388ecfae34a4f1fa57012599905eb9bf10383 /include | |
| parent | e3265a4386428d3d157d9565bb520aabff8b4bf0 (diff) | |
| download | linux-4a263bf331c512849062805ef1b4ac40301a9829.tar.xz | |
perf/x86/intel: Don't extend the pseudo-encoding to GP counters
The INST_RETIRED.PREC_DIST event (0x0100) doesn't count on SPR.
perf stat -e cpu/event=0xc0,umask=0x0/,cpu/event=0x0,umask=0x1/ -C0
Performance counter stats for 'CPU(s) 0':
607,246 cpu/event=0xc0,umask=0x0/
0 cpu/event=0x0,umask=0x1/
The encoding for INST_RETIRED.PREC_DIST is pseudo-encoding, which
doesn't work on the generic counters. However, current perf extends its
mask to the generic counters.
The pseudo event-code for a fixed counter must be 0x00. Check and avoid
extending the mask for the fixed counter event which using the
pseudo-encoding, e.g., ref-cycles and PREC_DIST event.
With the patch,
perf stat -e cpu/event=0xc0,umask=0x0/,cpu/event=0x0,umask=0x1/ -C0
Performance counter stats for 'CPU(s) 0':
583,184 cpu/event=0xc0,umask=0x0/
583,048 cpu/event=0x0,umask=0x1/
Fixes: 2de71ee153ef ("perf/x86/intel: Fix ICL/SPR INST_RETIRED.PREC_DIST encodings")
Signed-off-by: Kan Liang <kan.liang@linux.intel.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: stable@vger.kernel.org
Link: https://lkml.kernel.org/r/1648482543-14923-1-git-send-email-kan.liang@linux.intel.com
Diffstat (limited to 'include')
0 files changed, 0 insertions, 0 deletions