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Message-Id: <1406789104-25863-9-git-send-email-zheng.z.yan@intel.com> Date: Thu, 31 Jul 2014 14:45:03 +0800 From: "Yan, Zheng" <zheng.z.yan@...el.com> To: linux-kernel@...r.kernel.org Cc: a.p.zijlstra@...llo.nl, mingo@...nel.org, acme@...radead.org, eranian@...gle.com, andi@...stfloor.org, "Yan, Zheng" <zheng.z.yan@...el.com> Subject: [PATCH v4 8/9] perf, x86: enlarge PEBS buffer 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> --- 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 65457ca..61b6e33 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 /* -- 1.9.3 -- 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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