linux-kernel - Re: RFC: default group_isolation to 1, remove option

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Date:	Mon, 07 Mar 2011 21:36:52 +0100
From:	Jens Axboe <axboe@...nel.dk>
To:	Vivek Goyal <vgoyal@...hat.com>
CC:	Justin TerAvest <teravest@...gle.com>,
	Chad Talbott <ctalbott@...gle.com>,
	Nauman Rafique <nauman@...gle.com>,
	Divyesh Shah <dpshah@...gle.com>,
	lkml <linux-kernel@...r.kernel.org>,
	Gui Jianfeng <guijianfeng@...fujitsu.com>,
	Corrado Zoccolo <czoccolo@...il.com>
Subject: Re: RFC: default group_isolation to 1, remove option

On 2011-03-07 21:34, Vivek Goyal wrote:
> One side affect of limitless bio queueing is an AIO process can queue
> up lots of bios in a group and if one tries to kill the process, it
> waits for all the IOs to finish and can take up a very long time
> depending on throttling limits of the group.

But I doubt this is a problem, really. Sure you could queue tons of IO
with aio if you really wanted, but aio does maintain er per-system
limit. So it's not infinite. The fact that waiting for pending aios can
take a while if you ctrl-c or kill the process is not a real worry,
imho.

-- 
Jens Axboe

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