linux-kernel - [PATCHSET] writeback: convert writeback to unbound workqueue

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Date:	Thu,  7 Mar 2013 13:44:05 -0800
From:	Tejun Heo <tj@...nel.org>
To:	axboe@...nel.dk, laijs@...fujitsu.com, fengguang.wu@...el.com
Cc:	linux-kernel@...r.kernel.org, jmoyer@...hat.com
Subject: [PATCHSET] writeback: convert writeback to unbound workqueue

Hello,

There's no reason for writeback to implement its own worker pool when
using workqueue is much simpler and more efficient.  This patchset
replaces writeback's custom worker pool with unbound workqueue and
also exports it to userland using WQ_SYSFS so that it can be tuned
from userland as requested a couple releases ago.

This patchset contains the following four patches.

 0001-implement-current_is_workqueue_rescuer.patch
 0002-writeback-remove-unused-bdi_pending_list.patch
 0003-writeback-replace-custom-worker-pool-implementation-.patch
 0004-writeback-expose-the-bdi_wq-workqueue.patch

0001-0002 are prep patches.  0003 does the conversion.  0004 makes
bdi_wq visible to userland.

This patchset is on top of v3.9-rc1 + "workqueue: implement workqueue
with custom worker attributes" patchset[1] and available in the
following git branch.

 git://git.kernel.org/pub/scm/linux/kernel/git/tj/wq.git review-writeback-conversion

diffstat follows.  Thanks.

 fs/fs-writeback.c                |  102 ++++-----------
 include/linux/backing-dev.h      |   16 --
 include/linux/workqueue.h        |    1
 include/trace/events/writeback.h |    5
 kernel/workqueue.c               |   13 +
 mm/backing-dev.c                 |  259 ++++-----------------------------------
 6 files changed, 80 insertions(+), 316 deletions(-)

--
tejun

[1] http://thread.gmane.org/gmane.linux.kernel/1449826

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