Re: [VM PATCH 2.6.8-rc1] Prevent excessive scanning of lower zone

[Nick Piggin]

Shantanu Goel wrote:
> Hi Andrew,
>
> --- Andrew Morton <akpm@xxxxxxxx> wrote:
>
>
> > Shantanu Goel <sgoel01@xxxxxxxxx> wrote:
> >
> > > I emailed this a few weeks back to the list but it
> > > seems to have gotten lost...
> >
> > It came through.  I was unable to reproduce the
> > disproportional scanning
> > rate on almost exactly the same setup, so I parked
> > the problem for a while.
> >
> > I do agree with the analysis though.  The problem
> > _could_ occur.  I dunno
> > why it happens for you and not for me...
>
>
> Actually, the analysis turned out to be not entirely
> correct.  I think I have identified the offending
> code.  Please see attached patch.  It makes kswapd()
> skip zones which contain greater than "pages_high"
> pages.

You'd think so, but that isn't quite right. That blows
the incremental min thing in the page allocator.

I'm just about to send out a couple of patches for
comment on linux-mm, one of which should fix your problem.
I'll cc you on it.
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