From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1757321Ab0EKS55 (ORCPT ); Tue, 11 May 2010 14:57:57 -0400 Received: from hrndva-omtalb.mail.rr.com ([71.74.56.123]:46421 "EHLO hrndva-omtalb.mail.rr.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752654Ab0EKS5z (ORCPT ); Tue, 11 May 2010 14:57:55 -0400 X-Authority-Analysis: v=1.1 cv=RZg5C6NCKrCZril9sGGnsuGk01/OiP2z3O3lo0hXATg= c=1 sm=0 a=V1EeE3CHaDgA:10 a=GzHTLUccyWwA:10 a=gMqfjgEr1zLu/65IO0LwxA==:17 a=b8VgSBC0AAAA:8 a=VwQbUJbxAAAA:8 a=uWRYUrwWJtbqfdxOXWoA:9 a=dRj9ZR6ZrYutbkgz4ngA:7 a=P4y4fnqBvaOM0xMkckkjG8xmlSwA:4 a=gMqfjgEr1zLu/65IO0LwxA==:117 X-Cloudmark-Score: 0 X-Originating-IP: 74.67.89.75 Message-Id: <20100511182022.826921702@goodmis.org> User-Agent: quilt/0.48-1 Date: Tue, 11 May 2010 14:20:22 -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] [GIT PULL] tracing: Lowering the footprint of TRACE_EVENTs Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org [ Final version! ] Ingo, This 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 two weeks 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 618 syscalls), before this patch series, the size of vmlinux was: 6863829, and afterward: 6768675. That is 95,154 bytes in savings! (over 92K) Note: I did this series with disabling KERNEL_DEBUG and that made the effect of savings smaller. The original numbers with KERNEL_DEBUG options enabled was: orinal-16161794, new-16058182, savings-103612 which was over 100K) This may still be true with KERNEL_DEBUG enabled but I only tried it this time with it disabled. But if I go by percentage, this series saves 1.38% where the KERNEL_DEBUG series only saved 0.64% of the total vmlinux image. Config for this run can be found here: http://rostedt.homelinux.com/config-size Without tracing syscalls (82 events), it brought the size of vmlinux down from 6617121 to 659870. 18,421 bytes in savings. Note: Original numbers with KERNEL_DEBUG options enabled: original-1591046, new-15888394, savings-22071 Final changes: o Updated the change logs to reflect the sizes with KERNEL_DEBUG disabled. o Added Mathieu Desnoyers's Acked-by to the change logs. Changes in v3: o Ported to latest tip/tracing/core o Fixed typo in change log that a comment in LWN noticed: Wrote: 15999394 when it should have been 15888394. (Note: these numbers are from the original posting. I need to redo them again before posting officially). o Added Mathieu Desnoyers's check_trace patch that will check the callback to make sure it matches what DECLARE_TRACE() expects it. o Added the check_trace to the ftrace and perf callback probes. Note, kprobes and syscalls do not use the register tracepoint so they are not affected. o Moved the define of DECLARE_TRACE() and DECLARE_TRACE_NOARGS() out of the #ifdef CONFIG_TRACEPOINTS, since they were the same whether or not CONFIG_TRACEPOINTS was enabled. The internal __DECLARE_TRACE() changed. Changes in v2: o Ported to latest tip/tracing/core o Removed DECLARE_TRACE_DATA() and made DECLARE_TRACE() have the ability to pass a data parameter. This makes DECLARE_TRACE() not work with no args. A new DECLARE_TRACE_NOARGS() has been created that also allows data to be passed, but does is for tracepoint(void). o Made the callbacks be "proto, void *data" and typecast the data within the function. Please pull the latest tip/tracing/core tree, which can be found at: git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-2.6-trace.git tip/tracing/core Mathieu Desnoyers (1): tracepoints: Add check trace callback type Steven Rostedt (9): tracing: Create class struct for events tracing: Let tracepoints have data passed to tracepoint callbacks 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 | 73 ++++++-- include/linux/syscalls.h | 57 ++---- include/linux/tracepoint.h | 98 ++++++++--- include/trace/ftrace.h | 233 +++++++++--------------- include/trace/syscall.h | 10 +- kernel/trace/blktrace.c | 138 ++++++++------ kernel/trace/ftrace.c | 7 +- kernel/trace/kmemtrace.c | 70 +++++--- kernel/trace/trace.c | 9 +- kernel/trace/trace.h | 5 +- kernel/trace/trace_event_perf.c | 17 ++- kernel/trace/trace_events.c | 131 +++++++++----- kernel/trace/trace_events_filter.c | 28 ++-- kernel/trace/trace_export.c | 16 +- kernel/trace/trace_functions_graph.c | 13 +- kernel/trace/trace_kprobe.c | 104 +++++++---- kernel/trace/trace_output.c | 137 ++++++++++----- kernel/trace/trace_output.h | 2 +- kernel/trace/trace_sched_switch.c | 23 ++- kernel/trace/trace_sched_wakeup.c | 27 ++-- kernel/trace/trace_syscalls.c | 137 ++++++++++++--- kernel/trace/trace_workqueue.c | 26 ++- kernel/tracepoint.c | 91 +++++---- samples/tracepoints/tp-samples-trace.h | 4 +- samples/tracepoints/tracepoint-probe-sample.c | 13 +- samples/tracepoints/tracepoint-probe-sample2.c | 7 +- 26 files changed, 879 insertions(+), 597 deletions(-)