From: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
To: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>,
linux-kernel@vger.kernel.org, linux-mm@kvack.org,
Balbir Singh <balbir@linux.vnet.ibm.com>,
Rik van Riel <riel@redhat.com>,
Lee Schermerhorn <Lee.Schermerhorn@hp.com>,
Nick Piggin <npiggin@suse.de>
Subject: Re: [RFC][PATCH] page reclaim throttle take2
Date: Wed, 27 Feb 2008 09:50:05 +0900 [thread overview]
Message-ID: <20080227095005.4058e109.kamezawa.hiroyu@jp.fujitsu.com> (raw)
In-Reply-To: <1204060718.6242.333.camel@lappy>
On Tue, 26 Feb 2008 22:18:38 +0100
Peter Zijlstra <a.p.zijlstra@chello.nl> wrote:
> > +out:
> > + atomic_dec(&zone->nr_reclaimers);
> > + wake_up_all(&zone->reclaim_throttle_waitq);
> > +
> > + return ret;
> > +}
>
> Would it be possible - and worthwhile - to make this FIFO fair?
>
I think it doesn't make sense for fairness.
IMHO, this functionality is an unfair one in nature. While someone is
reclaiming pages, other processes can get a newly reclaimed page without
calling try_to_free_page.
For high-priority processes,
1. avoiding diving into try_to_free_pages if it's congested.
2. just waiting for that someone relcaim pages and grab it ASAP
maybe good for quick work.
Thanks,
-Kame
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next prev parent reply other threads:[~2008-02-27 0:50 UTC|newest]
Thread overview: 26+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-02-26 2:32 KOSAKI Motohiro
2008-02-26 21:18 ` Peter Zijlstra
2008-02-27 0:50 ` KAMEZAWA Hiroyuki [this message]
2008-02-27 4:26 ` KOSAKI Motohiro
2008-02-27 4:27 ` Balbir Singh
2008-02-27 4:45 ` KOSAKI Motohiro
2008-02-27 5:00 ` KAMEZAWA Hiroyuki
2008-02-27 5:04 ` KOSAKI Motohiro
2008-02-27 5:03 ` Balbir Singh
2008-02-27 5:13 ` KOSAKI Motohiro
2008-02-27 5:19 ` David Rientjes
2008-02-27 5:33 ` KOSAKI Motohiro
2008-02-27 5:47 ` David Rientjes
2008-02-27 5:48 ` Balbir Singh
2008-02-27 6:09 ` David Rientjes
2008-02-27 7:10 ` KOSAKI Motohiro
2008-02-27 7:19 ` David Rientjes
2008-02-27 7:51 ` KAMEZAWA Hiroyuki
2008-02-27 7:56 ` David Rientjes
2008-02-27 8:09 ` KAMEZAWA Hiroyuki
2008-02-27 15:30 ` Rik van Riel
2008-02-27 7:59 ` Balbir Singh
2008-02-27 8:47 ` David Rientjes
2008-02-27 9:01 ` Balbir Singh
2008-02-27 9:44 ` Peter Zijlstra
2008-02-27 6:52 ` KOSAKI Motohiro
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