From: Christoph Lameter <clameter@sgi.com>
To: Rik van Riel <riel@redhat.com>
Cc: Hugh Dickins <hugh@veritas.com>,
Andrew Morton <akpm@linux-foundation.org>,
Andi Kleen <ak@suse.de>,
Lee Schermerhorn <Lee.Schermerhorn@hp.com>,
linux-mm@kvack.org
Subject: Re: [PATCH 1/7] swapin_readahead: excise NUMA bogosity
Date: Mon, 8 Oct 2007 10:41:26 -0700 (PDT) [thread overview]
Message-ID: <Pine.LNX.4.64.0710081038050.26382@schroedinger.engr.sgi.com> (raw)
In-Reply-To: <20071008133538.6ee6ad05@bree.surriel.com>
On Mon, 8 Oct 2007, Rik van Riel wrote:
> Due to the way swapin_readahead works (and how swapout works),
> it can easily end up pulling in another task's memory with the
> current task's NUMA allocation policy.
I am not sure what you mean by "another task's memory"? How does memory
become owned by a task?
Having a variety of NUMA allocation strategies applied to the pages of one
file in memory is common for shared mmapped files like executables
already.
> If that is an issue, we may want to change swapin_readahead to
> access nearby ptes and divine swap entries from those, only
> pulling in memory that really belongs to the current process.
Well lets keep it simple. The association of pages to a process is not
that easy to establish if a page is shared.
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next prev parent reply other threads:[~2007-10-08 17:41 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-10-06 20:35 [PATCH 0/7] swapin/shmem patches Hugh Dickins
2007-10-06 20:38 ` [PATCH 1/7] swapin_readahead: excise NUMA bogosity Hugh Dickins
2007-10-06 22:43 ` Rik van Riel
2007-10-07 22:05 ` Andi Kleen
2007-10-07 22:37 ` Rik van Riel
2007-10-08 17:31 ` Christoph Lameter
2007-10-08 17:35 ` Rik van Riel
2007-10-08 17:41 ` Christoph Lameter [this message]
2007-10-08 17:47 ` Rik van Riel
2007-10-08 17:52 ` Christoph Lameter
2007-10-08 18:48 ` Rik van Riel
2007-10-06 20:39 ` [PATCH 2/7] swapin_readahead: move and rearrange args Hugh Dickins
2007-10-07 2:26 ` Rik van Riel
2007-10-06 20:43 ` [PATCH 3/7] swapin needs gfp_mask for loop on tmpfs Hugh Dickins
2007-10-07 23:23 ` Rik van Riel
2007-10-08 13:52 ` Peter Zijlstra
2007-10-06 20:45 ` [PATCH 4/7] shmem: SGP_QUICK and SGP_FAULT redundant Hugh Dickins
2007-10-07 23:23 ` Rik van Riel
2007-10-06 20:46 ` [PATCH 5/7] shmem_getpage return page locked Hugh Dickins
2007-10-07 8:01 ` Nick Piggin
2007-10-08 12:05 ` Hugh Dickins
2007-10-08 7:08 ` Nick Piggin
2007-10-08 0:44 ` Rik van Riel
2007-10-06 20:47 ` [PATCH 6/7] shmem_file_write is redundant Hugh Dickins
2007-10-08 0:46 ` Rik van Riel
2007-10-06 20:48 ` [PATCH 7/7] swapin: fix valid_swaphandles defect Hugh Dickins
2007-10-08 1:14 ` Rik van Riel
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