Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752601AbbEKC1D (ORCPT ); Sun, 10 May 2015 22:27:03 -0400 Received: from mga02.intel.com ([134.134.136.20]:63364 "EHLO mga02.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752432AbbEKCZp (ORCPT ); Sun, 10 May 2015 22:25:45 -0400 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.13,403,1427785200"; d="scan'208";a="491866183" From: Kan Liang To: peterz@infradead.org Cc: mingo@kernel.org, acme@infradead.org, eranian@google.com, andi@firstfloor.org, linux-kernel@vger.kernel.org, Kan Liang Subject: [PATCH V9 6/8] perf, x86: enlarge PEBS buffer Date: Sun, 10 May 2015 15:13:13 -0400 Message-Id: <1431285195-14269-7-git-send-email-kan.liang@intel.com> X-Mailer: git-send-email 1.8.3.1 In-Reply-To: <1431285195-14269-1-git-send-email-kan.liang@intel.com> References: <1431285195-14269-1-git-send-email-kan.liang@intel.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1228 Lines: 35 From: Yan, Zheng 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 Signed-off-by: Kan Liang --- 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 ba02783..328b10c 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 /* -- 1.8.3.1 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/