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List:       linux-mm
Subject:    Re: Kernel 2.6.8.1: swap storm of death - nr_requests > 1024 on
From:       Andrew Morton <akpm () osdl ! org>
Date:       2004-08-29 20:18:24
Message-ID: 20040829131824.1b39f2e8.akpm () osdl ! org
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Jens Axboe <axboe@suse.de> wrote:
>
>  > > It only happens with the CFQ elevator, and this backout patch makes it go
>  > > away.
>  > 
>  > It's not bizarre, if you backout that fix (it is a fix!), ->nr_requests
>  > isn't initialized when cfq gets there. So it'll throttle incorrectly in
>  > may_queue, not a good idea.
> 
>  Oh, and I think the main issue is the vm. It should cope correctly no
>  matter how much pending memory can be in progress on the queue, else it
>  should not write out so much. CFQ is just exposing this bug because it
>  defaults to bigger nr_requests.

That was my point.
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