From: Nick Piggin <npiggin@suse.de>
To: David Howells <dhowells@redhat.com>
Cc: Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
Linux Memory Management List <linux-mm@kvack.org>,
linux-arch@vger.kernel.org
Subject: Re: [rfc] increase struct page size?!
Date: Sat, 19 May 2007 03:30:13 +0200 [thread overview]
Message-ID: <20070519013013.GC15569@wotan.suse.de> (raw)
In-Reply-To: <7554.1179481350@redhat.com>
On Fri, May 18, 2007 at 10:42:30AM +0100, David Howells wrote:
> Nick Piggin <npiggin@suse.de> wrote:
>
> > I'd like to be the first to propose an increase to the size of struct page
> > just for the sake of increasing it!
>
> Heh. I'm surprised you haven't got more adverse reactions.
>
> > If we add 8 bytes to struct page on 64-bit machines, it becomes 64 bytes,
> > which is quite a nice number for cache purposes.
>
> Whilst that's true, if you have to deal with a run of contiguous page structs
> (eg: the page allocator, perhaps) it's actually less efficient because it
> takes more cache to do it. But, hey, it's a compromise whatever.
>
> In the scheme of things, if we're mostly dealing with individual page structs
> (as I think we are), then yes, I think it's probably a good thing to do -
> especially with larger page sizes.
Yeah, we would end up eating about 12.5% more cachelines for contiguous
runs of pages... but that only kicks in after we've touched 8 of them I
think, and by that point the accesses should be very prefetchable.
I think the average of 75% more cachelines touched for random accesses
is going to outweigh the contiguous batch savings, but that's just a
guess at this point.
-
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\0From linux-arch-owner@vger.kernel.org Mon May 21 00:56:59 2007
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Date: Sat, 19 May 2007 16:43:29 +0100
From: Andy Whitcroft <apw@shadowen.org>
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To: Christoph Lameter <clameter@sgi.com>
CC: Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
Linux Memory Management List <linux-mm@kvack.org>,
linux-arch@vger.kernel.org, Nick Piggin <npiggin@suse.de>
Subject: Re: [rfc] increase struct page size?! (now sparsemem vmemmap)
References: <20070518040854.GA15654@wotan.suse.de> <Pine.LNX.4.64.0705181112250.11881@schroedinger.engr.sgi.com> <20070519012530.GB15569@wotan.suse.de> <Pine.LNX.4.64.0705181901130.14521@schroedinger.engr.sgi.com>
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Christoph Lameter wrote:
> On Sat, 19 May 2007, Nick Piggin wrote:
>
>> Hugh points out that we should make _count and _mapcount atomic_long_t's,
>> which would probably be a better use of the space once your vmemmap goes
>> in.
>
> Well Andy was going to merge it:
>
> http://marc.info/?l=linux-kernel&m=117620162415620&w=2
>
> Andy when are we going to get the vmemmap patches into sparsemem?
Sorry this has been backed up with all the too-ing and fro-ing on other
things. I am just cleaning up the next round which includes feedback
from wli and first stab at PPC64 support. Should be out monday for review.
-apw
WARNING: multiple messages have this Message-ID (diff)
From: Nick Piggin <npiggin@suse.de>
To: David Howells <dhowells@redhat.com>
Cc: Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
Linux Memory Management List <linux-mm@kvack.org>,
linux-arch@vger.kernel.org
Subject: Re: [rfc] increase struct page size?!
Date: Sat, 19 May 2007 03:30:13 +0200 [thread overview]
Message-ID: <20070519013013.GC15569@wotan.suse.de> (raw)
In-Reply-To: <7554.1179481350@redhat.com>
On Fri, May 18, 2007 at 10:42:30AM +0100, David Howells wrote:
> Nick Piggin <npiggin@suse.de> wrote:
>
> > I'd like to be the first to propose an increase to the size of struct page
> > just for the sake of increasing it!
>
> Heh. I'm surprised you haven't got more adverse reactions.
>
> > If we add 8 bytes to struct page on 64-bit machines, it becomes 64 bytes,
> > which is quite a nice number for cache purposes.
>
> Whilst that's true, if you have to deal with a run of contiguous page structs
> (eg: the page allocator, perhaps) it's actually less efficient because it
> takes more cache to do it. But, hey, it's a compromise whatever.
>
> In the scheme of things, if we're mostly dealing with individual page structs
> (as I think we are), then yes, I think it's probably a good thing to do -
> especially with larger page sizes.
Yeah, we would end up eating about 12.5% more cachelines for contiguous
runs of pages... but that only kicks in after we've touched 8 of them I
think, and by that point the accesses should be very prefetchable.
I think the average of 75% more cachelines touched for random accesses
is going to outweigh the contiguous batch savings, but that's just a
guess at this point.
WARNING: multiple messages have this Message-ID (diff)
From: Nick Piggin <npiggin@suse.de>
To: David Howells <dhowells@redhat.com>
Cc: Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
Linux Memory Management List <linux-mm@kvack.org>,
linux-arch@vger.kernel.org
Subject: Re: [rfc] increase struct page size?!
Date: Sat, 19 May 2007 03:30:13 +0200 [thread overview]
Message-ID: <20070519013013.GC15569@wotan.suse.de> (raw)
In-Reply-To: <7554.1179481350@redhat.com>
On Fri, May 18, 2007 at 10:42:30AM +0100, David Howells wrote:
> Nick Piggin <npiggin@suse.de> wrote:
>
> > I'd like to be the first to propose an increase to the size of struct page
> > just for the sake of increasing it!
>
> Heh. I'm surprised you haven't got more adverse reactions.
>
> > If we add 8 bytes to struct page on 64-bit machines, it becomes 64 bytes,
> > which is quite a nice number for cache purposes.
>
> Whilst that's true, if you have to deal with a run of contiguous page structs
> (eg: the page allocator, perhaps) it's actually less efficient because it
> takes more cache to do it. But, hey, it's a compromise whatever.
>
> In the scheme of things, if we're mostly dealing with individual page structs
> (as I think we are), then yes, I think it's probably a good thing to do -
> especially with larger page sizes.
Yeah, we would end up eating about 12.5% more cachelines for contiguous
runs of pages... but that only kicks in after we've touched 8 of them I
think, and by that point the accesses should be very prefetchable.
I think the average of 75% more cachelines touched for random accesses
is going to outweigh the contiguous batch savings, but that's just a
guess at this point.
--
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next prev parent reply other threads:[~2007-05-19 1:30 UTC|newest]
Thread overview: 110+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-05-18 4:08 [rfc] increase struct page size?! Nick Piggin
2007-05-18 4:08 ` Nick Piggin
2007-05-18 4:47 ` David Miller
2007-05-18 4:47 ` David Miller, Nick Piggin
2007-05-18 5:12 ` Nick Piggin
2007-05-18 5:12 ` Nick Piggin
2007-05-18 5:22 ` David Miller
2007-05-18 5:22 ` David Miller, Nick Piggin
2007-05-18 5:31 ` Nick Piggin
2007-05-18 5:31 ` Nick Piggin
2007-05-18 18:15 ` Christoph Lameter
2007-05-18 18:15 ` Christoph Lameter
2007-05-18 7:19 ` Andrew Morton
2007-05-18 7:19 ` Andrew Morton
2007-05-18 7:32 ` Nick Piggin
2007-05-18 7:32 ` Nick Piggin
2007-05-18 7:43 ` Andrew Morton
2007-05-18 7:43 ` Andrew Morton
2007-05-18 7:59 ` Nick Piggin
2007-05-18 7:59 ` Nick Piggin
2007-05-18 9:42 ` David Howells
2007-05-18 9:42 ` David Howells
2007-05-19 1:30 ` Nick Piggin [this message]
2007-05-19 1:30 ` Nick Piggin
2007-05-19 1:30 ` Nick Piggin
2007-05-18 12:06 ` Andi Kleen
2007-05-18 12:06 ` Andi Kleen
2007-05-18 15:42 ` Hugh Dickins
2007-05-18 15:42 ` Hugh Dickins
2007-05-19 1:22 ` Nick Piggin
2007-05-19 1:22 ` Nick Piggin
2007-05-19 17:53 ` William Lee Irwin III
2007-05-19 17:53 ` William Lee Irwin III
2007-05-20 22:50 ` Matthew Wilcox
2007-05-20 22:50 ` Matthew Wilcox
2007-05-18 18:14 ` Christoph Lameter
2007-05-18 18:14 ` Christoph Lameter
2007-05-18 20:37 ` Luck, Tony
2007-05-18 20:37 ` Luck, Tony
2007-05-18 20:37 ` Luck, Tony
2007-05-21 6:28 ` KAMEZAWA Hiroyuki
2007-05-21 6:28 ` KAMEZAWA Hiroyuki
2007-05-19 1:25 ` Nick Piggin
2007-05-19 1:25 ` Nick Piggin
2007-05-19 2:03 ` [rfc] increase struct page size?! (now sparsemem vmemmap) Christoph Lameter
2007-05-19 2:03 ` Christoph Lameter
2007-05-19 15:43 ` Andy Whitcroft
2007-05-19 15:43 ` Andy Whitcroft
2007-05-19 18:15 ` [rfc] increase struct page size?! William Lee Irwin III
2007-05-19 18:15 ` William Lee Irwin III
2007-05-19 18:25 ` Christoph Lameter
2007-05-19 18:25 ` Christoph Lameter
2007-05-20 4:10 ` Eric Dumazet
2007-05-20 4:10 ` Eric Dumazet
2007-05-20 12:56 ` Andi Kleen
2007-05-20 12:56 ` Andi Kleen
2007-05-21 17:08 ` Christoph Lameter
2007-05-21 17:08 ` Christoph Lameter
2007-05-22 0:30 ` KAMEZAWA Hiroyuki
2007-05-22 0:30 ` KAMEZAWA Hiroyuki
2007-05-22 0:38 ` Christoph Lameter
2007-05-22 0:38 ` Christoph Lameter
2007-05-22 0:58 ` KAMEZAWA Hiroyuki
2007-05-22 0:58 ` KAMEZAWA Hiroyuki
2007-05-22 9:44 ` Geert Uytterhoeven
2007-05-22 9:44 ` Geert Uytterhoeven
2007-05-19 22:09 ` Andrew Morton
2007-05-19 22:09 ` Andrew Morton
2007-05-20 7:26 ` William Lee Irwin III
2007-05-20 7:26 ` William Lee Irwin III
2007-05-21 9:12 ` Helge Hafting
2007-05-21 9:12 ` Helge Hafting
2007-05-21 9:45 ` Nick Piggin
2007-05-21 9:45 ` Nick Piggin
2007-05-20 5:22 ` Nick Piggin
2007-05-20 5:22 ` Nick Piggin
2007-05-20 8:46 ` William Lee Irwin III
2007-05-20 8:46 ` William Lee Irwin III
2007-05-20 9:25 ` Nick Piggin
2007-05-20 9:25 ` Nick Piggin
2007-05-21 8:08 ` William Lee Irwin III
2007-05-21 8:08 ` William Lee Irwin III
2007-05-21 9:27 ` Nick Piggin
2007-05-21 9:27 ` Nick Piggin
2007-05-21 11:26 ` William Lee Irwin III
2007-05-21 11:26 ` William Lee Irwin III
2007-05-22 0:52 ` Nick Piggin
2007-05-22 0:52 ` Nick Piggin
2007-05-21 22:43 ` Matt Mackall
2007-05-21 22:43 ` Matt Mackall
2007-05-22 1:08 ` Nick Piggin
2007-05-22 1:08 ` Nick Piggin
2007-05-22 1:13 ` Christoph Lameter
2007-05-22 1:13 ` Christoph Lameter
2007-05-22 1:39 ` William Lee Irwin III
2007-05-22 1:39 ` William Lee Irwin III
2007-05-22 1:57 ` Nick Piggin
2007-05-22 1:57 ` Nick Piggin
2007-05-22 5:04 ` William Lee Irwin III
2007-05-22 5:04 ` William Lee Irwin III
2007-05-22 6:24 ` Nick Piggin
2007-05-22 6:24 ` Nick Piggin
2007-05-22 10:59 ` William Lee Irwin III
2007-05-22 10:59 ` William Lee Irwin III
2007-05-21 9:31 ` Eric Dumazet
2007-05-21 9:31 ` Eric Dumazet
2007-05-21 17:06 ` Christoph Lameter
2007-05-21 17:06 ` Christoph Lameter
2007-05-20 17:13 ` Andrea Arcangeli
2007-05-20 17:13 ` Andrea Arcangeli
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