Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755080Ab0DZUEm (ORCPT ); Mon, 26 Apr 2010 16:04:42 -0400 Received: from hrndva-omtalb.mail.rr.com ([71.74.56.124]:50755 "EHLO hrndva-omtalb.mail.rr.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752902Ab0DZUCo (ORCPT ); Mon, 26 Apr 2010 16:02:44 -0400 X-Authority-Analysis: v=1.1 cv=2/WNtoURsBD4grC4Rqfj62/w1mAETqRJkFX1sgq41IM= c=1 sm=0 a=lPRY93f6RJ0A:10 a=GzHTLUccyWwA:10 a=gMqfjgEr1zLu/65IO0LwxA==:17 a=VwQbUJbxAAAA:8 a=sAAo4dylcMOFJueGiA8A:9 a=mbW54HKC05yqqMlYY2gA:7 a=oIkumrG1tieOxTQg0IcjbT_MENkA:4 a=gMqfjgEr1zLu/65IO0LwxA==:117 X-Cloudmark-Score: 0 X-Originating-IP: 74.67.89.75 Message-Id: <20100426195024.256424113@goodmis.org> User-Agent: quilt/0.48-1 Date: Mon, 26 Apr 2010 15:50:24 -0400 From: Steven Rostedt To: linux-kernel@vger.kernel.org Cc: Ingo Molnar , Andrew Morton , Thomas Gleixner , Peter Zijlstra , Frederic Weisbecker , Arnaldo Carvalho de Melo , Mathieu Desnoyers , Lai Jiangshan , Li Zefan , Masami Hiramatsu , Christoph Hellwig Subject: [PATCH 00/10][RFC] tracing: Lowering the footprint of TRACE_EVENTs Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 3537 Lines: 81 This is an RFC patch set that also affects kprobes and perf. At the Linux Collaboration Summit, I talked with Mathieu and others about lowering the footprint of trace events. I spent all of last week trying to get the size as small as I could. Currently, each TRACE_EVENT() macro adds 1 - 5K per tracepoint. I got various results by adding a TRACE_EVENT() with the compiler, depending on config options that did not seem related. The new tracepoint I added would add between 1 and 5K, but I did not investigate enough to see what the true size was. What was consistent, was the DEFINE_EVENT(). Currently, it adds a little over 700 bytes per DEFINE_EVENT(). This patch series does not seem to affect TRACE_EVENT() much (had the same various sizes), but consistently brings DEFINE_EVENT()s down from 700 bytes to 250 bytes per DEFINE_EVENT(). Since syscalls use one "class" and are equivalent to DEFINE_EVENT() this can be a significant savings. With events and syscalls (82 events and 616 syscalls), before this patch series, the size of vmlinux was: 16161794, and afterward: 16058182. That is 103,612 bytes in savings! (over 100K) Without tracing syscalls (82 events), it brought the size of vmlinux down from 1591046 to 15999394. 22,071 bytes in savings. This is just an RFC (for now), to get peoples opinions on the changes. It does a bit of rewriting of the CPP macros, just to warning you ;-) -- Steve The code can be found at: git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-2.6-trace.git tip/tracing/rfc-1 Steven Rostedt (10): tracing: Create class struct for events tracing: Let tracepoints have data passed to tracepoint callbacks tracing: Convert TRACE_EVENT() to use the DECLARE_TRACE_DATA() tracing: Remove per event trace registering tracing: Move fields from event to class structure tracing: Move raw_init from events to class tracing: Allow events to share their print functions tracing: Move print functions into event class tracing: Remove duplicate id information in event structure tracing: Combine event filter_active and enable into single flags field ---- include/linux/ftrace_event.h | 71 +++++++++--- include/linux/syscalls.h | 55 +++------- include/linux/tracepoint.h | 119 ++++++++++++++++--- include/trace/ftrace.h | 215 ++++++++++------------------------ include/trace/syscall.h | 9 +- kernel/trace/blktrace.c | 13 ++- kernel/trace/kmemtrace.c | 28 +++-- kernel/trace/trace.c | 9 +- kernel/trace/trace.h | 5 +- kernel/trace/trace_event_perf.c | 17 ++- kernel/trace/trace_events.c | 126 +++++++++++++------- kernel/trace/trace_events_filter.c | 28 +++-- kernel/trace/trace_export.c | 16 ++- kernel/trace/trace_functions_graph.c | 2 +- kernel/trace/trace_kprobe.c | 104 ++++++++++------- kernel/trace/trace_output.c | 137 +++++++++++++++------- kernel/trace/trace_output.h | 2 +- kernel/trace/trace_syscalls.c | 105 +++++++++++++++-- kernel/tracepoint.c | 91 ++++++++------- 19 files changed, 700 insertions(+), 452 deletions(-) -- 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/