Re: vm lock contention reduction

Rik van Riel
2002-07-06T00:11:26Z

On Fri, 5 Jul 2002, Andrew Morton wrote:
> William Lee Irwin III wrote:
> > On Thu, Jul 04, 2002 at 07:18:34PM -0700, Andrew Morton wrote:
> > > Of course, that change means that we wouldn't be able to throttle
> > > page allocators against IO any more, and we'd have to do something
> > > smarter. What a shame ;)
> >
> > This is actually necessary IMHO. Some testing I've been able to do seems
> > to reveal the current throttling mechanism as inadequate.
>
> I don't think so. If you're referring to the situation where your
> 4G machine had 3.5G dirty pages without triggering writeback.
>
> That's not a generic problem.

But it is, mmap() and anonymous memory don't trigger writeback.

regards,

Rik
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