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| author | Yan, Zheng <zheng.z.yan@intel.com> | 2015-05-06 15:33:52 -0400 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2015-06-07 16:08:57 +0200 |
| commit | 156174999dd1d0fe8732f5a05f4e9cef921ad487 (patch) | |
| tree | 75b5fd291e0d587fddc8f97263fafbcc30a282b4 /arch/x86 | |
| parent | 9c964efa4330a58520783effe9847f15126fef1f (diff) | |
| download | linux-156174999dd1d0fe8732f5a05f4e9cef921ad487.tar.gz | |
perf/intel/x86: Enlarge the PEBS buffer
Currently the PEBS buffer size is 4k, it can only hold about 21 PEBS records. This patch enlarges the PEBS buffer size to 64k (the same as the BTS buffer). 64k memory can hold about 330 PEBS records. This will significantly reduce the number of PMIs when batched PEBS interrupts are enabled. Signed-off-by: Yan, Zheng <zheng.z.yan@intel.com> Signed-off-by: Kan Liang <kan.liang@intel.com> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: H. Peter Anvin <hpa@zytor.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: acme@infradead.org Cc: eranian@google.com Link: http://lkml.kernel.org/r/1430940834-8964-7-git-send-email-kan.liang@intel.com Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'arch/x86')
| -rw-r--r-- | arch/x86/kernel/cpu/perf_event_intel_ds.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/x86/kernel/cpu/perf_event_intel_ds.c b/arch/x86/kernel/cpu/perf_event_intel_ds.c index 62852470ccbb..266079a3a646 100644 --- a/arch/x86/kernel/cpu/perf_event_intel_ds.c +++ b/arch/x86/kernel/cpu/perf_event_intel_ds.c @@ -11,7 +11,7 @@ #define BTS_RECORD_SIZE 24 #define BTS_BUFFER_SIZE (PAGE_SIZE << 4) -#define PEBS_BUFFER_SIZE PAGE_SIZE +#define PEBS_BUFFER_SIZE (PAGE_SIZE << 4) #define PEBS_FIXUP_SIZE PAGE_SIZE /* |