From mboxrd@z Thu Jan 1 00:00:00 1970 From: Dan Williams Subject: [PATCH -mm 0/4] raid5: stripe_queue (+20% to +90% write performance) Date: Sat, 06 Oct 2007 10:06:39 -0700 Message-ID: <20071006170538.23741.75193.stgit@dwillia2-linux.ch.intel.com> Mime-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Return-path: Sender: linux-raid-owner@vger.kernel.org To: neilb@suse.de, akpm@linux-foundation.org Cc: linux-raid@vger.kernel.org List-Id: linux-raid.ids Neil, Here is the latest spin of the 'stripe_queue' implementation. Thanks to raid6+bitmap testing done by Mr. James W. Laferriere there have been several cleanups and fixes since the last release. Also, the changes are now spread over 4 patches to isolate one conceptual change per patch. The most significant cleanup is removing the stripe_head back pointer from stripe_queue. This effectively makes the queuing layer independent from the caching layer. Expansion support needs more testing. See the individual patch changelogs for details. Patch 1 contains updated performance numbers. Andrew, These are updated in the git-md-accel tree, but I will work the finalized versions through Neil's 'Signed-off-by' path. Dan Williams (4): raid5: add the stripe_queue object for tracking raid io requests (rev3) raid5: split allocation of stripe_heads and stripe_queues raid5: convert add_stripe_bio to add_queue_bio raid5: use stripe_queues to prioritize the "most deserving" requests (rev7) drivers/md/raid5.c | 1560 ++++++++++++++++++++++++++++++++------------ include/linux/raid/raid5.h | 88 ++- 2 files changed, 1200 insertions(+), 448 deletions(-) -- Dan