linux-kernel - Re: [patch 0/4 v2] blk-mq: use percpu

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Date:	Tue, 15 Oct 2013 09:16:31 -0600
From:	Jens Axboe <axboe@...nel.dk>
To:	Shaohua Li <shli@...nel.org>
Cc:	linux-kernel@...r.kernel.org, kmo@...erainc.com
Subject: Re: [patch 0/4 v2] blk-mq: use percpu_ida to manage tags

On Tue, Oct 15 2013, Shaohua Li wrote:
> 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, I've rebased it to 3.12-rc5 and applied the series.

-- 
Jens Axboe

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