From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752520Ab3AWUel (ORCPT ); Wed, 23 Jan 2013 15:34:41 -0500 Received: from hrndva-omtalb.mail.rr.com ([71.74.56.122]:20969 "EHLO hrndva-omtalb.mail.rr.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752169Ab3AWUee (ORCPT ); Wed, 23 Jan 2013 15:34:34 -0500 X-Authority-Analysis: v=2.0 cv=bJmU0YCZ c=1 sm=0 a=rXTBtCOcEpjy1lPqhTCpEQ==:17 a=mNMOxpOpBa8A:10 a=Ciwy3NGCPMMA:10 a=iGnaqPf3E_8A:10 a=5SG0PmZfjMsA:10 a=bbbx4UPp9XUA:10 a=meVymXHHAAAA:8 a=VALziabHa1QA:10 a=VwQbUJbxAAAA:8 a=xG-pfG5gSQSMnBJ5kLkA:9 a=rXTBtCOcEpjy1lPqhTCpEQ==:117 X-Cloudmark-Score: 0 X-Authenticated-User: X-Originating-IP: 74.67.115.198 Message-Id: <20130123203002.957226869@goodmis.org> User-Agent: quilt/0.60-1 Date: Wed, 23 Jan 2013 15:30:02 -0500 From: Steven Rostedt To: linux-kernel@vger.kernel.org Cc: Ingo Molnar , Andrew Morton , Frederic Weisbecker Subject: [PATCH 00/12 -next] [for linux-next] ftrace: Recursion protection and speed up Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org This change set replaces the function tracing recursion protection with a context one, that keeps track of interrupts, NMIs, softirqs, such that we do not need to disable interrupts and not miss any events, as the old recursion protection had a race where interrupt events could be dropped. This also speeds up function tracing by 15% or more. I'm posting these as a generic review of the changes I'll be pushing into linux-next and will be pushing this for 3.9. These patches have passed a series of tests I've run on few machines with several different configs and such. You can find the patches here. I'll add these to linux-next tomorrow. -- Steve git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace.git tip/perf/core Head SHA1: 0b07436d95b5404134da4d661fd183eac863513e Steven Rostedt (12): tracing: Remove trace.h header from trace_clock.c tracing: Fix race with max_tr and changing tracers tracing: Fix selftest function recursion accounting ftrace: Fix global function tracers that are not recursion safe ftrace: Fix function tracing recursion self test ftrace: Optimize the function tracer list loop ftrace: Add context level recursion bit checking tracing: Make the trace recursion bits into enums tracing: Avoid unnecessary multiple recursion checks ftrace: Use only the preempt version of function tracing ring-buffer: User context bit recursion checking ring-buffer: Remove trace.h from ring_buffer.c ---- kernel/trace/ftrace.c | 82 ++++++++++++++++--------- kernel/trace/ring_buffer.c | 88 ++++++++++++++++++-------- kernel/trace/trace.c | 29 ++++++--- kernel/trace/trace.h | 133 ++++++++++++++++++++++++++++++++++++---- kernel/trace/trace_clock.c | 2 - kernel/trace/trace_functions.c | 61 +++++------------- kernel/trace/trace_selftest.c | 19 ++---- 7 files changed, 275 insertions(+), 139 deletions(-)