All of lore.kernel.org
 help / color / mirror / Atom feed
From: Shaohua Li <shli@kernel.org>
To: linux-kernel@vger.kernel.org, axboe@kernel.dk
Cc: kmo@daterainc.com
Subject: [patch 0/4] blk-mq: use percpu_ida to manage tags
Date: Fri, 11 Oct 2013 15:18:02 +0800	[thread overview]
Message-ID: <20131011071802.148101321@kernel.org> (raw)

Hi, blk-mq and percpu_ida use similar algorithm to manage tags. The difference
is when a cpu can't allocate tags, blk-mq will use ipi to purge remote cpu
cache, while percpu-ida directly purges remote cpu cache. In practice, the
percpu-ida approach is much faster when we can't allocate enough for percpu
cache.

This patch makes blk-mq use percpu_ida to manage tags, this avoids some
duplicate code and has better performance as I mentioned. To test the patches,
rebase blk-mq tree to latest kernel first.

Thanks,
Shaohua

             reply	other threads:[~2013-10-11  7:22 UTC|newest]

Thread overview: 13+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2013-10-11  7:18 Shaohua Li [this message]
2013-10-11  7:18 ` [patch 1/4] percpu_ida: make percpu_ida percpu size/batch configurable Shaohua Li
2013-10-11 20:31   ` Kent Overstreet
2013-10-12  0:52     ` Shaohua Li
2013-10-11  7:18 ` [patch 2/4] percpu_ida: add percpu_ida_for_each_free Shaohua Li
2013-10-11 20:34   ` Kent Overstreet
2013-10-11  7:18 ` [patch 3/4] percpu_ida: add an API to return free tags Shaohua Li
2013-10-11 20:35   ` Kent Overstreet
2013-10-12  1:02     ` Shaohua Li
2013-10-11  7:18 ` [patch 4/4] blk-mq: switch to percpu-ida for tag menagement Shaohua Li
2013-10-11 14:28   ` Jens Axboe
2013-10-12  0:49     ` Shaohua Li
2013-10-13 18:26       ` Jens Axboe

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=20131011071802.148101321@kernel.org \
    --to=shli@kernel.org \
    --cc=axboe@kernel.dk \
    --cc=kmo@daterainc.com \
    --cc=linux-kernel@vger.kernel.org \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body. 
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.