From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756577Ab1BQPAi (ORCPT ); Thu, 17 Feb 2011 10:00:38 -0500 Received: from hera.kernel.org ([140.211.167.34]:37960 "EHLO hera.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753458Ab1BQPAg (ORCPT ); Thu, 17 Feb 2011 10:00:36 -0500 Date: Thu, 17 Feb 2011 15:00:17 GMT From: tip-bot for Ian Munsie Cc: linux-kernel@vger.kernel.org, hpa@zytor.com, mingo@redhat.com, rostedt@goodmis.org, tglx@linutronix.de, imunsie@au1.ibm.com Reply-To: mingo@redhat.com, hpa@zytor.com, linux-kernel@vger.kernel.org, rostedt@goodmis.org, tglx@linutronix.de, imunsie@au1.ibm.com In-Reply-To: <1296703645-18718-7-git-send-email-imunsie@au1.ibm.com> References: <1296703645-18718-7-git-send-email-imunsie@au1.ibm.com> To: linux-tip-commits@vger.kernel.org Subject: [tip:perf/core] tracing/syscalls: Early terminate search for sys_ni_syscall Message-ID: Git-Commit-ID: ae07f551c42d6e4162436ca452a199deac9dab4d X-Mailer: tip-git-log-daemon Robot-ID: Robot-Unsubscribe: Contact to get blacklisted from these emails MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Disposition: inline X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.2.3 (hera.kernel.org [127.0.0.1]); Thu, 17 Feb 2011 15:00:17 +0000 (UTC) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Commit-ID: ae07f551c42d6e4162436ca452a199deac9dab4d Gitweb: http://git.kernel.org/tip/ae07f551c42d6e4162436ca452a199deac9dab4d Author: Ian Munsie AuthorDate: Thu, 3 Feb 2011 14:27:25 +1100 Committer: Steven Rostedt CommitDate: Mon, 7 Feb 2011 21:30:14 -0500 tracing/syscalls: Early terminate search for sys_ni_syscall Many system calls are unimplemented and mapped to sys_ni_syscall, but at boot ftrace would still search through every syscall metadata entry for a match which wouldn't be there. This patch adds causes the search to terminate early if the system call is not mapped. Signed-off-by: Ian Munsie LKML-Reference: <1296703645-18718-7-git-send-email-imunsie@au1.ibm.com> Signed-off-by: Steven Rostedt --- kernel/trace/trace_syscalls.c | 3 +++ 1 files changed, 3 insertions(+), 0 deletions(-) diff --git a/kernel/trace/trace_syscalls.c b/kernel/trace/trace_syscalls.c index 86a23e7..ee7b5a0 100644 --- a/kernel/trace/trace_syscalls.c +++ b/kernel/trace/trace_syscalls.c @@ -85,6 +85,9 @@ find_syscall_meta(unsigned long syscall) stop = __stop_syscalls_metadata; kallsyms_lookup(syscall, NULL, NULL, NULL, str); + if (arch_syscall_match_sym_name(str, "sys_ni_syscall")) + return NULL; + for ( ; start < stop; start++) { if ((*start)->name && arch_syscall_match_sym_name(str, (*start)->name)) return *start;