From: Nick Piggin <nickpiggin@yahoo.com.au>
To: linux-ia64@vger.kernel.org
Subject: Re: [very very drafty] prezeroing to increase the page fault rate
Date: Thu, 16 Dec 2004 02:17:49 +0000 [thread overview]
Message-ID: <1103163469.6730.41.camel@npiggin-nld.site> (raw)
In-Reply-To: <Pine.LNX.4.58.0412141832350.6975@schroedinger.engr.sgi.com>
On Wed, 2004-12-15 at 16:41 -0800, Christoph Lameter wrote:
> On Thu, 16 Dec 2004, Nick Piggin wrote:
> > Also just a stupid question - would an madvise(..., MADV_PREFAULT)
> > be of use to you? Or is that too difficult to get a good NUMA
> > allocation layout?
>
> Its easy to implement. The current code already checks for MADV_RAND and
> switches off prefaulting for that case.
Oh yeah that could be useful too (ie. pre-enlarging the prefault window)
What I had meant though is: MADV_PREFAULT will allocate pages and
instantiate ptes and allocate pages for the region specified. So your
large app would call that on startup and not take any faults in future.
The problem I was imagining is that the allocations will all come from
the caller with regard to NUMA behaviour... so the app would need to
be aware of that (and eg. have each thread call MADV_PREFAULT on their
own working set).
Nick
next prev parent reply other threads:[~2004-12-16 2:17 UTC|newest]
Thread overview: 99+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-12-15 2:34 [very very drafty] prezeroing to increase the page fault rate Christoph Lameter
2004-12-15 21:21 ` Robin Holt
2004-12-15 21:58 ` Christoph Lameter
2004-12-15 22:00 ` Christoph Lameter
2004-12-16 0:25 ` Nick Piggin
2004-12-16 0:41 ` Christoph Lameter
2004-12-16 0:41 ` Linus Torvalds
2004-12-16 0:46 ` Christoph Lameter
2004-12-16 0:50 ` Nick Piggin
2004-12-16 0:54 ` Christoph Lameter
2004-12-16 1:18 ` Linus Torvalds
2004-12-16 1:44 ` Christoph Lameter
2004-12-16 1:55 ` Linus Torvalds
2004-12-16 2:17 ` Nick Piggin [this message]
2004-12-16 7:59 ` Nick Piggin
2004-12-16 16:27 ` Christoph Lameter
2004-12-16 18:38 ` Luck, Tony
2004-12-16 22:37 ` Nick Piggin
2004-12-21 19:55 ` Increase page fault rate by prezeroing V1 [0/3]: Overview Christoph Lameter
2004-12-21 19:56 ` Increase page fault rate by prezeroing V1 [1/3]: Introduce __GFP_ZERO Christoph Lameter
2004-12-21 19:57 ` Increase page fault rate by prezeroing V1 [2/3]: zeroing and scrubd Christoph Lameter
2005-01-01 2:22 ` Increase page fault rate by prezeroing V1 [2/3]: zeroing and Nick Piggin
2005-01-01 2:55 ` Increase page fault rate by prezeroing V1 [2/3]: zeroing and scrubd pmarques
2004-12-21 19:57 ` Increase page fault rate by prezeroing V1 [3/3]: Altix SN2 BTE Christoph Lameter
2004-12-22 12:46 ` Increase page fault rate by prezeroing V1 [3/3]: Altix SN2 BTE Zeroing Robin Holt
2004-12-22 19:56 ` Increase page fault rate by prezeroing V1 [3/3]: Altix SN2 BTE Christoph Lameter
2004-12-23 19:29 ` Prezeroing V2 [0/3]: Why and When it works Christoph Lameter
2004-12-23 19:33 ` Prezeroing V2 [1/4]: __GFP_ZERO / clear_page() removal Christoph Lameter
2004-12-23 19:33 ` Prezeroing V2 [2/4]: add second parameter to clear_page() for all Christoph Lameter
2004-12-24 8:33 ` Prezeroing V2 [2/4]: add second parameter to clear_page() for all arches Pavel Machek
2004-12-24 16:18 ` Prezeroing V2 [2/4]: add second parameter to clear_page() for Christoph Lameter
2004-12-24 16:27 ` Prezeroing V2 [2/4]: add second parameter to clear_page() for all arches Pavel Machek
2004-12-24 17:02 ` Prezeroing V2 [2/4]: add second parameter to clear_page() for David S. Miller
2004-12-24 17:05 ` David S. Miller
2004-12-27 22:48 ` David S. Miller
2005-01-03 17:52 ` Christoph Lameter
2005-01-01 10:24 ` Geert Uytterhoeven
2005-01-04 23:12 ` Prezeroing V3 [0/4]: Discussion and i386 performance tests Christoph Lameter
2005-01-04 23:13 ` Prezeroing V3 [1/4]: Allow request for zeroed memory Christoph Lameter
2005-01-04 23:45 ` Dave Hansen
2005-01-05 1:16 ` Christoph Lameter
2005-01-05 1:26 ` Linus Torvalds
2005-01-05 23:11 ` Christoph Lameter
2005-01-05 0:34 ` Linus Torvalds
2005-01-05 0:47 ` Andrew Morton
2005-01-05 1:15 ` Christoph Lameter
2005-01-08 21:12 ` Hugh Dickins
2005-01-08 21:56 ` David S. Miller
2005-01-21 20:09 ` alloc_zeroed_user_highpage to fix the clear_user_highpage issue Christoph Lameter
2005-02-09 9:58 ` [Patch] Fix oops in alloc_zeroed_user_highpage() when page is NULL Michael Ellerman
2005-01-21 20:12 ` Extend clear_page by an order parameter Christoph Lameter
2005-01-21 22:29 ` Paul Mackerras
2005-01-21 23:48 ` Christoph Lameter
2005-01-22 0:35 ` Paul Mackerras
2005-01-22 0:43 ` Andrew Morton
2005-01-22 1:08 ` Paul Mackerras
2005-01-22 1:20 ` Roman Zippel
2005-01-22 1:25 ` Paul Mackerras
2005-01-22 1:54 ` Christoph Lameter
2005-01-22 2:53 ` Paul Mackerras
2005-01-23 7:45 ` Andrew Morton
2005-01-24 16:37 ` Christoph Lameter
2005-01-24 20:23 ` David S. Miller
2005-01-24 20:33 ` Christoph Lameter
2005-01-10 17:16 ` Prezeroing V3 [1/4]: Allow request for zeroed memory Christoph Lameter
2005-01-10 18:13 ` Linus Torvalds
2005-01-10 20:17 ` Christoph Lameter
2005-01-10 23:53 ` Prezeroing V4 [0/4]: Overview Christoph Lameter
2005-01-10 23:54 ` Prezeroing V4 [1/4]: Arch specific page zeroing during page fault Christoph Lameter
2005-01-11 0:41 ` Chris Wright
2005-01-11 0:46 ` Prezeroing V4 [1/4]: Arch specific page zeroing during page Christoph Lameter
2005-01-11 0:49 ` Prezeroing V4 [1/4]: Arch specific page zeroing during page fault Chris Wright
2005-01-10 23:55 ` Prezeroing V4 [2/4]: Zeroing implementation Christoph Lameter
2005-01-10 23:55 ` Prezeroing V4 [3/4]: Altix SN2 BTE zero driver Christoph Lameter
2005-01-10 23:56 ` Prezeroing V4 [4/4]: Extend clear_page to take an order parameter Christoph Lameter
2005-01-04 23:14 ` Prezeroing V3 [2/4]: Extension of clear_page to take an order Christoph Lameter
2005-01-05 23:25 ` Christoph Lameter
2005-01-04 23:15 ` Prezeroing V3 [3/4]: Page zeroing through kscrubd Christoph Lameter
2005-01-04 23:16 ` Prezeroing V3 [4/4]: Driver for hardware zeroing on Altix Christoph Lameter
2004-12-23 19:34 ` Prezeroing V2 [3/4]: Add support for ZEROED and NOT_ZEROED free maps Christoph Lameter
2004-12-23 19:35 ` Prezeroing V2 [4/4]: Hardware Zeroing through SGI BTE Christoph Lameter
2004-12-23 20:08 ` Prezeroing V2 [1/4]: __GFP_ZERO / clear_page() removal Brian Gerst
2004-12-24 16:24 ` Christoph Lameter
2004-12-23 19:49 ` Prezeroing V2 [0/3]: Why and When it works Arjan van de Ven
2004-12-23 20:57 ` Matt Mackall
2004-12-23 21:01 ` Paul Mackerras
2004-12-23 21:11 ` Paul Mackerras
2004-12-23 21:37 ` Andrew Morton
2004-12-23 23:00 ` Paul Mackerras
2004-12-23 21:48 ` Linus Torvalds
2004-12-23 22:34 ` Zwane Mwaikambo
2004-12-24 9:14 ` Arjan van de Ven
2004-12-24 18:21 ` Linus Torvalds
2004-12-24 18:57 ` Arjan van de Ven
2004-12-27 22:50 ` David S. Miller
2004-12-28 11:53 ` Marcelo Tosatti
2004-12-24 16:17 ` Christoph Lameter
2004-12-24 18:31 ` Increase page fault rate by prezeroing V1 [0/3]: Overview Andrea Arcangeli
2005-01-03 17:54 ` Christoph Lameter
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