Re: [CFT][PATCH] smoother VM for -ac

From: Rik van Riel (
Date: Wed Oct 10 2001 - 16:25:27 EST

On Wed, 10 Oct 2001, Benjamin LaHaise wrote:
> On Wed, Oct 10, 2001 at 05:25:30PM -0300, Rik van Riel wrote:
> > 4) in page_alloc.c, the "slowdown" reschedule has been
> > made stronger by turning it into a try_to_free_pages(),

> There's a small problem with this one: I know that during
> testing of earlier 2.4 kernels we saw a livelock which was
> caused by the vm subsystem spinning without scheduling. This
> can happen in a couple of cases like NFS where another task has
> to be allowed to run in order to make progress in clearing
> pages.

OK, I'll add back the reschedule() to fix this case.

I don't like it too much, but I wouldn't know of an
easier way to fix the NFS thing. I guess we could delay
it to the zone->pages_min point though ... should cut
down on the number of reschedules ;)



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