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Message-Id: <20131011071802.148101321@kernel.org>
Date: Fri, 11 Oct 2013 15:18:02 +0800
From: Shaohua Li <shli@...nel.org>
To: linux-kernel@...r.kernel.org, axboe@...nel.dk
Cc: kmo@...erainc.com
Subject: [patch 0/4] 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.
Thanks,
Shaohua
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