lkml.org 
[lkml]   [2013]   [Oct]   [14]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
Subject[patch 0/4 v2] blk-mq: use percpu_ida to manage tags
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.

The v2 patch updated some log descriptions, fixed one issue Kent pointed out
and added performance data.

Thanks,
Shaohua


\
 
 \ /
  Last update: 2013-10-15 03:21    [W:0.043 / U:0.060 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site