diff options
| author |   Jiri Olsa <jolsa@redhat.com> | 2016-03-01 20:03:52 +0100 |
|---|---|---|
| committer |   Ingo Molnar <mingo@kernel.org> | 2016-03-08 12:18:32 +0100 |
| commit | e72daf3f4d764c47fb71c9bdc7f9c54a503825b1 (patch) | |
| tree | 0ba39e046d71722ee9247bf3d7de095ac5ed9e93 /arch/x86/events/perf_event.h | |
| parent | perf/core: Fix perf_sched_count derailment (diff) | |
| download | linux-dev-e72daf3f4d764c47fb71c9bdc7f9c54a503825b1.tar.xz linux-dev-e72daf3f4d764c47fb71c9bdc7f9c54a503825b1.zip | |
perf/x86/intel: Use PAGE_SIZE for PEBS buffer size on Core2
Using PAGE_SIZE buffers makes the WRMSR to PERF_GLOBAL_CTRL in
intel_pmu_enable_all() mysteriously hang on Core2. As a workaround, we
don't do this.
The hard lockup is easily triggered by running 'perf test attr'
repeatedly. Most of the time it gets stuck on sample session with
small periods.
# perf test attr -vv
14: struct perf_event_attr setup :
--- start ---
...
'PERF_TEST_ATTR=/tmp/tmpuEKz3B /usr/bin/perf record -o /tmp/tmpuEKz3B/perf.data -c 123 kill >/dev/null 2>&1' ret 1
Reported-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Andi Kleen <ak@linux.intel.com>
Cc: <stable@vger.kernel.org>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Kan Liang <kan.liang@intel.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Stephane Eranian <eranian@google.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Vince Weaver <vincent.weaver@maine.edu>
Cc: Wang Nan <wangnan0@huawei.com>
Link: http://lkml.kernel.org/r/20160301190352.GA8355@krava.redhat.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to '')
| -rw-r--r-- | arch/x86/events/perf_event.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/arch/x86/events/perf_event.h b/arch/x86/events/perf_event.h index 7bb61e32fb29..1ab6279fed1d 100644 --- a/arch/x86/events/perf_event.h +++ b/arch/x86/events/perf_event.h @@ -586,6 +586,7 @@ struct x86_pmu { pebs_broken :1, pebs_prec_dist :1; int pebs_record_size; + int pebs_buffer_size; void (*drain_pebs)(struct pt_regs *regs); struct event_constraint *pebs_constraints; void (*pebs_aliases)(struct perf_event *event); |