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Message-Id: <1428597466-8154-7-git-send-email-kan.liang@intel.com> Date: Thu, 9 Apr 2015 12:37:46 -0400 From: Kan Liang <kan.liang@...el.com> To: a.p.zijlstra@...llo.nl, linux-kernel@...r.kernel.org Cc: mingo@...nel.org, acme@...radead.org, eranian@...gle.com, andi@...stfloor.org, Kan Liang <kan.liang@...el.com> Subject: [PATCH V6 6/6] perf, x86: enlarge PEBS buffer From: Yan, Zheng <zheng.z.yan@...el.com> Currently the PEBS buffer size is 4k, it only can hold about 21 PEBS records. This patch enlarges the PEBS buffer size to 64k (the same as BTS buffer), 64k memory can hold about 330 PEBS records. This will significantly the reduce number of PMI when large PEBS interrupt threshold is used. Signed-off-by: Yan, Zheng <zheng.z.yan@...el.com> Signed-off-by: Kan Liang <kan.liang@...el.com> --- arch/x86/kernel/cpu/perf_event_intel_ds.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/arch/x86/kernel/cpu/perf_event_intel_ds.c b/arch/x86/kernel/cpu/perf_event_intel_ds.c index 3d8950a..dfbcaad 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 /* -- 1.7.11.7 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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