Re: [Xen-devel] [PATCH] Dump flush write performance

Keir Fraser
Thu, 25 Oct 2007 14:32:59 -0000

On 24/10/07 22:10, "Ben Guthro" <bguthro@virtualiron.com> wrote:

> Two changes to avoid disk driver using up kernel memory and triggering
> oom-killer
> while creating guest dump to a disk file:
>
> 1) Decreased write chunks from 16MB to 2MB;
> 2) Flush (fsync) after each 2MB write.

I don''t think we''ve had any reports of core dumping causing
oom killer to
kick in. It seems a bit unlikely after all, unless you''re really
running
dom0 close to the wire. A user process write()ing a big file shouldn''t
be
able to trigger oom killer imo.

 -- Keir



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