linux-kernel - Re: [RFC][PATCH] Per file dirty limit throttling

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Message-ID: <1282141518.1926.4048.camel@laptop>
Date:	Wed, 18 Aug 2010 16:25:18 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	balbir@...ux.vnet.ibm.com
Cc:	Nikanth Karthikesan <knikanth@...e.de>,
	Wu Fengguang <fengguang.wu@...el.com>,
	Bill Davidsen <davidsen@....com>, linux-kernel@...r.kernel.org,
	linux-mm@...ck.org, Jens Axboe <axboe@...nel.dk>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Jan Kara <jack@...e.cz>
Subject: Re: [RFC][PATCH] Per file dirty limit throttling

On Wed, 2010-08-18 at 19:38 +0530, Balbir Singh wrote:

> There is an ongoing effort to look at per-cgroup dirty limits and I
> honestly think it would be nice to do it at that level first. We need
> it there as a part of the overall I/O controller. As a specialized
> need it could handle your case as well. 

Well, it would be good to isolate that to the cgroup code. Also from
what I understood, the plan was to simply mark dirty inodes with a
cgroup and use that from writeout_inodes() to write out inodes
specifically used by that cgroup.

That is, on top of what Andrea Righi already proposed, which would
provide the actual per cgroup dirty limit (although the per-bdi
proportions applied to a cgroup limit aren't strictly correct, but that
seems to be something you'll have to live with, a per-bdi-per-cgroup
proportion would simply be accounting insanity).

That is a totally different thing than what was proposed.

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