Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754912AbbDTPUW (ORCPT ); Mon, 20 Apr 2015 11:20:22 -0400 Received: from mga02.intel.com ([134.134.136.20]:60746 "EHLO mga02.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754182AbbDTPTp (ORCPT ); Mon, 20 Apr 2015 11:19:45 -0400 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.11,609,1422950400"; d="scan'208";a="698006588" 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 V7 6/6] perf, x86: enlarge PEBS buffer Date: Mon, 20 Apr 2015 04:07:50 -0400 Message-Id: <1429517270-8079-7-git-send-email-kan.liang@intel.com> X-Mailer: git-send-email 1.8.3.1 In-Reply-To: <1429517270-8079-1-git-send-email-kan.liang@intel.com> References: <1429517270-8079-1-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 01f68b1..ce754ee 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/