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| author | Luo Gengkun <luogengkun@huaweicloud.com> | 2025-04-23 06:47:24 +0000 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2025-04-24 20:15:04 +0200 |
| commit | 1a97fea9db9e9b9c4839d4232dde9f505ff5b4cc (patch) | |
| tree | 8943f2bbed6fd0c6903c89549a319cd25caa2312 /drivers/fpga/tests/fpga-region-test.c | |
| parent | 0db61388b389f43c1ba2f1cee3613feb4fd12150 (diff) | |
| download | linux-1a97fea9db9e9b9c4839d4232dde9f505ff5b4cc.tar.gz linux-1a97fea9db9e9b9c4839d4232dde9f505ff5b4cc.tar.bz2 linux-1a97fea9db9e9b9c4839d4232dde9f505ff5b4cc.zip | |
perf/x86: Fix non-sampling (counting) events on certain x86 platforms
Perf doesn't work at perf stat for hardware events on certain x86 platforms:
$perf stat -- sleep 1
Performance counter stats for 'sleep 1':
16.44 msec task-clock # 0.016 CPUs utilized
2 context-switches # 121.691 /sec
0 cpu-migrations # 0.000 /sec
54 page-faults # 3.286 K/sec
<not supported> cycles
<not supported> instructions
<not supported> branches
<not supported> branch-misses
The reason is that the check in x86_pmu_hw_config() for sampling events is
unexpectedly applied to counting events as well.
It should only impact x86 platforms with limit_period used for non-PEBS
events. For Intel platforms, it should only impact some older platforms,
e.g., HSW, BDW and NHM.
Fixes: 88ec7eedbbd2 ("perf/x86: Fix low freqency setting issue")
Signed-off-by: Luo Gengkun <luogengkun@huaweicloud.com>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Reviewed-by: Kan Liang <kan.liang@linux.intel.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Ravi Bangoria <ravi.bangoria@amd.com>
Link: https://lore.kernel.org/r/20250423064724.3716211-1-luogengkun@huaweicloud.com
Diffstat (limited to 'drivers/fpga/tests/fpga-region-test.c')
0 files changed, 0 insertions, 0 deletions