From: Jeremy Fitzhardinge <jeremy@goop.org>
To: Matt Mackall <mpm@selenic.com>
Cc: David Miller <davem@davemloft.net>,
nickpiggin@yahoo.com.au, akpm@linux-foundation.org,
clameter@sgi.com, linux-mm@kvack.org,
linux-kernel@vger.kernel.org
Subject: Re: [QUICKLIST 0/4] Arch independent quicklists V2
Date: Tue, 13 Mar 2007 14:36:11 -0700 [thread overview]
Message-ID: <45F7194B.5080705@goop.org> (raw)
In-Reply-To: <20070313211435.GP10394@waste.org>
Matt Mackall wrote:
> Well you -could- do this:
>
> - reuse a long in struct page as a used map that divides the page up
> into 32 or 64 segments
> - every time you set a PTE, set the corresponding bit in the mask
> - when we zap, only visit the regions set in the mask
>
> Thus, you avoid visiting most of a PMD page in the sparse case,
> assuming PTEs aren't evenly spread across the PMD.
>
> This might not even be too horrible as the appropriate struct page
> should be in cache with the appropriate bits of the mm already locked,
> etc.
>
And do the same in pte pages for actual mapped pages? Or do you think
they would be too densely populated for it to be worthwhile?
J
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next prev parent reply other threads:[~2007-03-13 21:36 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20070313071325.4920.82870.sendpatchset@schroedinger.engr.sgi.com>
[not found] ` <20070313005334.853559ca.akpm@linux-foundation.org>
[not found] ` <45F65ADA.9010501@yahoo.com.au>
[not found] ` <20070313035250.f908a50e.akpm@linux-foundation.org>
2007-03-13 11:06 ` Nick Piggin
2007-03-13 12:15 ` Andrew Morton
2007-03-13 11:20 ` Christoph Lameter
2007-03-13 12:30 ` Andrew Morton
2007-03-15 20:23 ` Christoph Lameter
2007-03-13 11:30 ` Nick Piggin
2007-03-13 12:47 ` Andrew Morton
2007-03-13 12:01 ` Nick Piggin
2007-03-13 13:11 ` Andrew Morton
2007-03-13 12:18 ` Nick Piggin
2007-03-13 17:30 ` Jeremy Fitzhardinge
2007-03-13 20:03 ` Matt Mackall
2007-03-13 20:17 ` Jeremy Fitzhardinge
2007-03-13 20:21 ` Matt Mackall
2007-03-13 21:07 ` David Miller, Matt Mackall
2007-03-13 21:14 ` Matt Mackall
2007-03-13 21:36 ` Jeremy Fitzhardinge [this message]
2007-03-13 21:46 ` Peter Chubb
2007-03-13 21:48 ` David Miller, Matt Mackall
2007-03-14 1:12 ` William Lee Irwin III
2007-03-15 23:12 ` William Lee Irwin III
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