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From: Andrew Morton <akpm@linux-foundation.org>
To: Christoph Lameter <clameter@sgi.com>
Cc: Hugh Dickins <hugh@veritas.com>, linux-mm@kvack.org
Subject: Re: Drop PageReclaim()
Date: Thu, 8 Feb 2007 14:03:38 -0800	[thread overview]
Message-ID: <20070208140338.971b3f53.akpm@linux-foundation.org> (raw)
In-Reply-To: <Pine.LNX.4.64.0702081351270.14036@schroedinger.engr.sgi.com>

On Thu, 8 Feb 2007 13:55:22 -0800 (PST)
Christoph Lameter <clameter@sgi.com> wrote:

> Oh gosh. I hope I finally got my head around this. The page is taken off 
> the LRU for writeback then PageReclaim is set and its put back to the 
> inactive list when writeback ends. This is different from regular file 
> writeback where we leave the page on the LRU.
> 

No, the page remains on the LRU while it's under writeback.

It goes like this:

During the vmscan we encounter a page at the tail of the inactive list
which we want to reclaim, but it's dirty.  So we start writeout and then
move it to the head of the inactive list and keep scanning.

When writeback completes, we take a look at the page to see if it still
seems to be reclaimable and if so, move it to the tail of the inactive list
so that it will be reclaimed very soon.

PG_reclaim is used to indicate pages which need this treatment.

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  reply	other threads:[~2007-02-08 22:03 UTC|newest]

Thread overview: 20+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2007-02-07 14:13 Drop PageReclaim() Christoph Lameter
2007-02-07 14:32 ` Hugh Dickins
2007-02-08 21:20   ` Christoph Lameter
2007-02-08 21:38     ` Christoph Lameter
2007-02-08 21:42       ` Christoph Lameter
2007-02-08 21:55         ` Christoph Lameter
2007-02-08 22:03           ` Andrew Morton [this message]
2007-02-08 22:14             ` Christoph Lameter
2007-02-08 22:24               ` Andrew Morton
2007-02-08 22:26                 ` Christoph Lameter
2007-02-08 22:37                   ` Andrew Morton
2007-02-08 22:40                     ` Christoph Lameter
2007-02-08 23:13                       ` Andrew Morton
2007-02-09  0:22                         ` Christoph Lameter
2007-02-09  0:39                           ` Andrew Morton
2007-02-09  1:06                             ` Christoph Lameter
2007-02-09  1:18                               ` Andrew Morton
2007-02-11  5:12                             ` Rik van Riel
2007-02-07 17:25 ` Andrew Morton
2007-02-08 21:19   ` Christoph Lameter

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