linux-kernel - Re: [patch 1/4] percpu_ida: make percpu

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Date:	Sat, 12 Oct 2013 08:52:27 +0800
From:	Shaohua Li <shli@...nel.org>
To:	Kent Overstreet <kmo@...erainc.com>
Cc:	linux-kernel@...r.kernel.org, axboe@...nel.dk
Subject: Re: [patch 1/4] percpu_ida: make percpu_ida percpu size/batch
 configurable

On Fri, Oct 11, 2013 at 01:31:52PM -0700, Kent Overstreet wrote:
> On Fri, Oct 11, 2013 at 03:18:03PM +0800, Shaohua Li wrote:
> > Make percpu_ida percpu size/batch configurable. The block-mq-tag will use it.
> 
> Can you explain the justification for this? Performance...?

The performance using percpu_ida for tag management? Please see the patch 4
thread.  If you ask the justification of making the size/batch configurable,
the answer is we might have no enough tags, and default cache size/batch is too
aggressive.

Thanks,
Shaohua
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