perf/intel/x86: Enlarge the PEBS buffer
authorYan, Zheng <zheng.z.yan@intel.com>
Wed, 6 May 2015 19:33:52 +0000 (15:33 -0400)
committerIngo Molnar <mingo@kernel.org>
Sun, 7 Jun 2015 14:08:57 +0000 (16:08 +0200)
commit156174999dd1d0fe8732f5a05f4e9cef921ad487
tree75b5fd291e0d587fddc8f97263fafbcc30a282b4
parent9c964efa4330a58520783effe9847f15126fef1f
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>
arch/x86/kernel/cpu/perf_event_intel_ds.c