From: Marcelo Tosatti <marcelo.tosatti@cyclades.com>
To: Rik van Riel <riel@redhat.com>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>,
linux-mm@kvack.org, linux-kernel@vger.kernel.org,
Andrew Morton <akpm@osdl.org>,
Christoph Lameter <christoph@lameter.com>,
Wu Fengguang <wfg@mail.ustc.edu.cn>,
Nick Piggin <npiggin@suse.de>, Marijn Meijles <marijn@bitpit.net>
Subject: Re: [PATCH 1/9] clockpro-nonresident.patch
Date: Sat, 31 Dec 2005 20:20:17 -0200 [thread overview]
Message-ID: <20051231222017.GC4024@dmt.cnet> (raw)
In-Reply-To: <Pine.LNX.4.63.0512310951210.27198@cuia.boston.redhat.com>
On Sat, Dec 31, 2005 at 09:53:11AM -0500, Rik van Riel wrote:
> On Sat, 31 Dec 2005, Peter Zijlstra wrote:
>
> > > > +/*
> > > > + * For interactive workloads, we remember about as many non-resident pages
> > > > + * as we have actual memory pages. For server workloads with large inter-
> > > > + * reference distances we could benefit from remembering more.
> > > > + */
> > >
> > > This comment is bogus. Interactive or server loads have nothing to do
> > > with the inter reference distance. To the contrary, interactive loads
> > > have a higher chance to contain large inter reference distances, and
> > > many common server loads have strong locality.
> > >
> > > <snip>
> >
> > Happy to drop it, Rik?
>
> Sorry, but the comment is accurate.
>
> For interactive workloads you want to forget interreference
> distances between two updatedbs, even if mozilla didn't get
> used all weekend.
>
> OTOH, on NFS servers, or other systems with large interreference
> distances, you may _need_ to remember a larger set of non-resident
> pages in order to find the pages that are the hottest.
>
> In those workloads, the shortest inter-reference distance might
> still be larger than the size of memory...
Sure, for the few cases you describe here the comment is valid.
Happy new year!
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next prev parent reply other threads:[~2005-12-31 22:20 UTC|newest]
Thread overview: 66+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-12-30 22:40 [PATCH] vm: page-replace and clockpro Peter Zijlstra
2005-12-30 22:40 ` [PATCH 01/14] page-replace-single-batch-insert.patch Peter Zijlstra
2005-12-31 7:03 ` Marcelo Tosatti
2005-12-31 9:43 ` Peter Zijlstra
2005-12-31 14:44 ` Rik van Riel
2005-12-31 22:19 ` Marcelo Tosatti
2005-12-30 22:40 ` [PATCH 02/14] page-replace-try_pageout.patch Peter Zijlstra
2005-12-30 22:40 ` [PATCH 03/14] page-replace-remove-sc-from-refill.patch Peter Zijlstra
2005-12-30 22:40 ` [PATCH 04/14] page-replace-activate_page.patch Peter Zijlstra
2005-12-30 22:41 ` [PATCH 05/14] page-replace-remove-loop.patch Peter Zijlstra
2005-12-30 22:41 ` [PATCH 06/14] page-replace-move-macros.patch Peter Zijlstra
2005-12-30 22:41 ` [PATCH 07/14] page-replace-move-isolate_lru_pages.patch Peter Zijlstra
2005-12-30 22:41 ` [PATCH 08/14] page-replace-candidates.patch Peter Zijlstra
2005-12-30 22:41 ` [PATCH 09/14] page-replace-reinsert.patch Peter Zijlstra
2005-12-30 22:41 ` [PATCH 10/14] page-replace-remove-mm_inline.patch Peter Zijlstra
2005-12-30 22:42 ` [PATCH 11/14] page-replace-move-refill.patch Peter Zijlstra
2005-12-30 22:42 ` [PATCH 12/14] page-replace-rotate.patch Peter Zijlstra
2005-12-30 22:42 ` [PATCH 13/14] page-replace-init.patch Peter Zijlstra
2005-12-30 22:42 ` [PATCH 14/14] page-replace-kswapd-incmin.patch Peter Zijlstra
2005-12-31 1:15 ` Marcelo Tosatti
2005-12-31 9:40 ` Peter Zijlstra
2005-12-30 22:42 ` [PATCH 1/9] clockpro-nonresident.patch Peter Zijlstra
2005-12-31 1:13 ` Marcelo Tosatti
2005-12-31 9:54 ` Peter Zijlstra
2005-12-31 14:53 ` Rik van Riel
2005-12-31 22:20 ` Marcelo Tosatti [this message]
2005-12-30 22:42 ` [PATCH 2/9] clockpro-nonresident-del.patch Peter Zijlstra
2005-12-30 22:43 ` [PATCH 3/9] clockpro-PG_test.patch Peter Zijlstra
2005-12-30 22:43 ` [PATCH 4/9] clockpro-use-once.patch Peter Zijlstra
2005-12-30 22:43 ` [PATCH 5/9] clockpro-ignore_token.patch Peter Zijlstra
2005-12-30 22:43 ` [PATCH 6/9] clockpro-clockpro.patch Peter Zijlstra
2005-12-31 0:24 ` Marcelo Tosatti
2005-12-31 1:22 ` Rik van Riel
2005-12-31 3:27 ` Marcelo Tosatti
2005-12-31 5:24 ` Rik van Riel
2005-12-31 10:57 ` Peter Zijlstra
2005-12-31 10:48 ` Peter Zijlstra
2005-12-31 22:12 ` Marcelo Tosatti
2006-01-03 19:30 ` Christoph Lameter
2005-12-31 11:29 ` Peter Zijlstra
2006-01-05 9:47 ` IWAMOTO Toshihiro
2006-01-05 13:32 ` Rik van Riel
2006-01-06 9:01 ` IWAMOTO Toshihiro
2006-01-24 6:30 ` IWAMOTO Toshihiro
2006-01-24 7:25 ` IWAMOTO Toshihiro
2006-01-25 8:00 ` Peter Zijlstra
2006-02-03 9:25 ` Peter Zijlstra
2006-02-06 9:30 ` IWAMOTO Toshihiro
2006-02-06 10:07 ` Peter Zijlstra
2006-02-08 10:05 ` IWAMOTO Toshihiro
2006-02-08 20:00 ` Peter Zijlstra
2006-02-09 6:57 ` Peter Zijlstra
2006-02-09 7:22 ` IWAMOTO Toshihiro
2006-02-09 10:07 ` IWAMOTO Toshihiro
2006-02-09 15:23 ` Rik van Riel
2006-02-08 9:53 ` IWAMOTO Toshihiro
2005-12-31 22:40 ` Marcelo Tosatti
2006-01-01 10:37 ` Peter Zijlstra
2006-01-03 12:21 ` Marcelo Tosatti
2006-02-14 7:29 ` IWAMOTO Toshihiro
2006-02-15 6:35 ` Peter Zijlstra
2006-02-16 6:25 ` IWAMOTO Toshihiro
2005-12-30 22:43 ` [PATCH 7/9] clockpro-remove-old.patch Peter Zijlstra
2005-12-30 22:43 ` [PATCH 8/9] clockpro-rename_PG_active.patch Peter Zijlstra
2005-12-30 22:44 ` [PATCH 9/9] clockpro-clockpro-stats.patch Peter Zijlstra
2005-12-31 18:59 ` [PATCH 10/9] clockpro-document.patch Peter Zijlstra
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