[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Message-Id: <20070918110337.7d23b3aa.akpm@linux-foundation.org>
Date: Tue, 18 Sep 2007 11:03:37 -0700
From: Andrew Morton <akpm@...ux-foundation.org>
To: Nick Piggin <nickpiggin@...oo.com.au>
Cc: Hisashi Hifumi <hifumi.hisashi@....ntt.co.jp>,
linux-kernel@...r.kernel.org, linux-mm@...ck.org
Subject: Re: [PATCH] mm: use pagevec to rotate reclaimable page
On Tue, 18 Sep 2007 11:47:44 +1000 Nick Piggin <nickpiggin@...oo.com.au> wrote:
> On Wednesday 19 September 2007 03:44, Andrew Morton wrote:
> > On Tue, 18 Sep 2007 11:29:50 +1000 Nick Piggin <nickpiggin@...oo.com.au>
> wrote:
> > > It would be interesting to test -mm kernels. They have a patch which
> > > reduces zone lock contention quite a lot.
> >
> > They do? Which patch?
>
> Hmm... mm-buffered-write-cleanup.patch.
hmm.
>
> > > I think your patch is a nice idea, and with less zone lock contention in
> > > other areas, it is possible that it might produce a relatively larger
> > > improvement.
> >
> > I'm a bit wobbly about this patch - it adds additional single-cpu overhead
> > to reduce multiple-cpu overhead and latency.
>
> Yeah, that's true. Although maybe it gets significantly more after the
> patch in -mm.
>
> Possibly other page batching sites have similar issues on UP... I wonder
> if a type of pagevec that turns into a noop on UP would be interesting...
> probably totally unmeasurable and not worth the cost of code
> maintenance ;)
Yes, I wonder that. Some of the additional overhead will come from
the additional get_page/put_page which is needed for pagevec ownership.
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
Powered by blists - more mailing lists