From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756410Ab2DTWxi (ORCPT ); Fri, 20 Apr 2012 18:53:38 -0400 Received: from outmail006.snc4.facebook.com ([66.220.144.140]:54789 "EHLO intmgw002.snc4.facebook.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1756326Ab2DTWw5 (ORCPT ); Fri, 20 Apr 2012 18:52:57 -0400 From: Arun Sharma To: linux-kernel@vger.kernel.org Cc: Arun Sharma , Linus Torvalds , Peter Zijlstra , Ingo Molnar Subject: [PATCH 2/4] perf: Limit callchains to 127 Date: Fri, 20 Apr 2012 15:41:34 -0700 Message-Id: <1334961696-19580-3-git-send-email-asharma@fb.com> X-Mailer: git-send-email 1.7.8.4 In-Reply-To: <1334961696-19580-1-git-send-email-asharma@fb.com> References: <1334961696-19580-1-git-send-email-asharma@fb.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Stack depth of 255 seems excessive, given that copy_from_user_nmi() could be slow. Signed-off-by: Arun Sharma Cc: Linus Torvalds Cc: Peter Zijlstra Cc: Ingo Molnar Cc: linux-kernel@vger.kernel.org --- include/linux/perf_event.h | 2 +- 1 files changed, 1 insertions(+), 1 deletions(-) diff --git a/include/linux/perf_event.h b/include/linux/perf_event.h index ddbb6a9..d1e71c1 100644 --- a/include/linux/perf_event.h +++ b/include/linux/perf_event.h @@ -609,7 +609,7 @@ struct perf_guest_info_callbacks { #include #include -#define PERF_MAX_STACK_DEPTH 255 +#define PERF_MAX_STACK_DEPTH 127 struct perf_callchain_entry { __u64 nr; -- 1.7.8.4