From: William Lee Irwin III <wli@holomorphy.com>
To: Marc Singer <elf@buici.com>
Cc: linux-mm@kvack.org
Subject: Re: Might refill_inactive_zone () be too aggressive?
Date: Fri, 16 Apr 2004 23:18:47 -0700 [thread overview]
Message-ID: <20040417061847.GC743@holomorphy.com> (raw)
In-Reply-To: <20040417060920.GC29393@flea>
On Fri, Apr 16, 2004 at 11:09:20PM -0700, Marc Singer wrote:
> 5) Removing the reclaim_mapped=1 line improves system response
> dramatically...just as I'd expect.
> So, is this something to worry about? Should it be a tunable feature?
> Should this be something addressed in the platform specific VM code?
A very interesting point there. The tendency to set reclaim_mapped = 1
is controlled by /proc/sys/vm/swappiness; setting that to 0 may improve
your performance or behave closer to how the case you cited where vmscan.c
never sets reclaim_mapped = 1 improved performance.
The default value is 60, which begins unmapping mapped memory about
when 40% of memory is mapped by userspace.
-- wli
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next prev parent reply other threads:[~2004-04-17 6:18 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-04-17 6:09 Might refill_inactive_zone () be too aggressive? Marc Singer
2004-04-17 6:18 ` William Lee Irwin III [this message]
2004-04-17 14:08 ` Marc Singer
2004-04-17 14:21 ` William Lee Irwin III
2004-04-17 17:16 ` William Lee Irwin III
2004-04-17 17:57 ` Marc Singer
2004-04-17 18:10 ` William Lee Irwin III
2004-04-17 18:28 ` Marc Singer
2004-04-17 18:33 ` William Lee Irwin III
2004-04-17 18:44 ` Marc Singer
2004-04-17 19:19 ` William Lee Irwin III
2004-04-17 19:25 ` Marc Singer
2004-04-17 19:45 ` William Lee Irwin III
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