linux-kernel - [PATCHSET] block: improve tracepoints, take#2

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Message-Id: <1357938397-5413-1-git-send-email-tj@kernel.org>
Date:	Fri, 11 Jan 2013 13:06:32 -0800
From:	Tejun Heo <tj@...nel.org>
To:	axboe@...nel.dk
Cc:	linux-kernel@...r.kernel.org, chavey@...gle.com,
	fengguang.wu@...el.com
Subject: [PATCHSET] block: improve tracepoints, take#2

Hello, Jens.

This is the second take.  Changes from the first take[L] are

* writeback_dirty_buffer TP was botched.  It made build fail when
  CONFIG_BLOCK is not set (reported by Fengguang) and I somehow lost
  its actual triggering in mark_buffer_dirty() while splitting
  patches.  Made it a block TP instead so that it can share TP
  definition with block_touch_buffer and restored the triggering from
  mark_buffer_dirty().

This patchset fixes/improves bio_complete TP so that block layer
proper triggers for all completing bios instead of stackign drivers
triggering them manually and adds more buffer / block / writeback TPs.
These improve visibility in general and are already in use in google.

This patchset contains the following five patches.

0001-block-add-missing-block_bio_complete-tracepoint.patch
0002-block-add-req-to-bio_-front-back-_merge-tracepoints.patch
0003-buffer-make-touch_buffer-an-exported-function.patch
0004-block-add-block_-touch-dirty-_buffer-tracepoint.patch
0005-writeback-add-more-tracepoints.patch

It's based on top of v3.8-rc2 and also available in the following git
branch.

 git://git.kernel.org/pub/scm/linux/kernel/git/tj/misc.git block-tps

diffstat follows.  Thanks.

 block/blk-core.c                 |    5 -
 drivers/md/dm.c                  |    1
 drivers/md/raid5.c               |   11 ---
 fs/bio.c                         |    2
 fs/buffer.c                      |   10 +++
 fs/fs-writeback.c                |   16 ++++-
 include/linux/blktrace_api.h     |    1
 include/linux/buffer_head.h      |    2
 include/trace/events/block.h     |  104 +++++++++++++++++++++++++++++-----
 include/trace/events/writeback.h |  116 +++++++++++++++++++++++++++++++++++++++
 kernel/trace/blktrace.c          |   28 ++++++++-
 mm/page-writeback.c              |    2
 12 files changed, 263 insertions(+), 35 deletions(-)

--
tejun

[L] http://thread.gmane.org/gmane.linux.kernel/1419141
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