linux-kernel - [PATCH 0/6] kill-the-BKL/reiserfs3: performance improvements, faster than Bkl based scheme

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Date:	Fri,  1 May 2009 04:44:16 +0200
From:	Frederic Weisbecker <fweisbec@...il.com>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Jeff Mahoney <jeffm@...e.com>,
	ReiserFS Development List <reiserfs-devel@...r.kernel.org>,
	Chris Mason <chris.mason@...cle.com>,
	Alexander Beregalov <a.beregalov@...il.com>,
	Alessio Igor Bogani <abogani@...ware.it>,
	Jonathan Corbet <corbet@....net>,
	Alexander Viro <viro@...iv.linux.org.uk>
Subject: [PATCH 0/6] kill-the-BKL/reiserfs3: performance improvements, faster than Bkl based scheme

Hi,

This reiserfs patchset applies against latest tip:core/kill-the-BKL
It adds various explicit write lock releases on specific sleeping sections.

A performance test with dbench on UP with 100 processus during 100 seconds
gives the following results:

Locking		  Throughput 

Bkl:              11.2587 MB/s
Write lock/Mutex: 12.5713 MB/s

So the new locking scheme makes it 11% faster than with the bkl.

It's not possible to compare it on the kill-the-BKL tree because the Bkl
is not anymore a Bkl inside but a plain Mutex.

Instead, you can apply the following equivalent patch against -rc3 to test it:
http://www.kernel.org/pub/linux/kernel/people/frederic/reiserfs-kill-the-bkl-full.patch

Of course it might eat your data, make you cows produce black milk, bring coffee
to your children at 3:00 am, turn the teletubbies song in your mind for
seven years long and so...

Frederic.

The following changes since commit a3a2b793d18bc068b79508e96eba33ae2326f759:
  Alessio Igor Bogani (1):
        remove the BKL: remove "BKL auto-drop" assumption from ext3_remount()

are available in the git repository at:

  git://git.kernel.org/pub/scm/linux/kernel/git/frederic/random-tracing.git bkl

Frederic Weisbecker (6):
      kill-the-BKL/reiserfs: release write lock on fs_changed()
      kill-the-BKL/reiserfs: release the write lock before rescheduling on do_journal_end()
      kill-the-BKL/reiserfs: release write lock while rescheduling on prepare_for_delete_or_cut()
      kill-the-BKL/reiserfs: release the write lock inside get_neighbors()
      kill-the-BKL/reiserfs: release the write lock inside reiserfs_read_bitmap_block()
      kill-the-BKL/reiserfs: release the write lock on flush_commit_list()

 fs/reiserfs/bitmap.c        |    2 ++
 fs/reiserfs/fix_node.c      |    4 ++++
 fs/reiserfs/journal.c       |    9 +++++++--
 fs/reiserfs/stree.c         |    2 ++
 include/linux/reiserfs_fs.h |    8 +++++++-
 5 files changed, 22 insertions(+), 3 deletions(-)
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