linux-kernel - Re: [PATCH V3] block/throttle: Add IO throttled information in blkio.throttle

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Message-ID: <20121018232404.GW13370@google.com>
Date:	Thu, 18 Oct 2012 16:24:04 -0700
From:	Tejun Heo <tj@...nel.org>
To:	Vivek Goyal <vgoyal@...hat.com>
Cc:	Robin Dong <robin.k.dong@...il.com>, linux-kernel@...r.kernel.org,
	Robin Dong <sanbai@...bao.com>, Jens Axboe <axboe@...nel.dk>,
	Tao Ma <boyu.mt@...bao.com>
Subject: Re: [PATCH V3] block/throttle: Add IO throttled information in
 blkio.throttle

Hello, Vivek.

On Wed, Oct 17, 2012 at 09:49:45AM -0400, Vivek Goyal wrote:
> Can you explain a bit more. Whe do you mean by "total number queued". I
> think throttle.io_queued will total number of bios queued in the cgroup
> at the time of query.

Instead of exposing the number that blk-throttle currently has
deferred, we can expose the number of bios that have been sent to
blk-throttle and the number of bios which left blk-throttle, both
monotically increasing and the difference indicating the number being
deferred.  That way we can stick to the usual stats facility.

Thanks.

-- 
tejun
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