From: Arjan van de Ven <arjanv@redhat.com>
To: Linus Torvalds <torvalds@osdl.org>
Cc: Nick Piggin <nickpiggin@yahoo.com.au>,
"David S. Miller" <davem@davemloft.net>,
akpm@osdl.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org
Subject: Re: [RFC][PATCH 0/3] beat kswapd with the proverbial clue-bat
Date: Sun, 5 Sep 2004 20:41:46 +0200 [thread overview]
Message-ID: <20040905184146.GA6849@devserv.devel.redhat.com> (raw)
In-Reply-To: <Pine.LNX.4.58.0409051051120.2331@ppc970.osdl.org>
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On Sun, Sep 05, 2004 at 10:58:07AM -0700, Linus Torvalds wrote:
>
>
> On Sun, 5 Sep 2004, Arjan van de Ven wrote:
> >
> > well... we have a reverse mapping now. What is stopping us from doing
> > physical defragmentation ?
>
> Nothing but replacement policy, really, and the fact that not everything
> is rmappable.
>
> I think we should _normally_ honor replacement policy, the way we do now.
yes it absolutely is quite a heavy hammer.
However right now the alternative (free a LOT of memory and hope it
collapses into higher order ones) is even heavier, freeing the wrong 8 pages
is less of a disturbance than freeing 8000 of the mostly wrong pages ;)
I absolutely agree this heavy hammer only should trigger if there is a
request for a higher order page that isn't there. Doing it from a special
thread does make sense, makes it relatively easy to keep track of such
wakeups and more importantly rate limit them etc.
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next prev parent reply other threads:[~2004-09-05 18:41 UTC|newest]
Thread overview: 32+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-09-05 5:44 Nick Piggin
2004-09-05 5:45 ` [RFC][PATCH 1/3] account free buddy areas Nick Piggin
2004-09-05 5:46 ` [RFC][PATCH 2/3] alloc-order watermarks Nick Piggin
2004-09-05 5:47 ` [RFC][PATCH 3/3] teach kswapd about watermarks Nick Piggin
2004-09-05 6:04 ` David S. Miller
2004-09-05 6:20 ` Nick Piggin
2004-09-05 5:50 ` [RFC][PATCH 2/3] alloc-order watermarks Nick Piggin
2004-09-05 6:13 ` [RFC][PATCH 1/3] account free buddy areas Nick Piggin
2004-09-05 6:02 ` [RFC][PATCH 0/3] beat kswapd with the proverbial clue-bat David S. Miller
2004-09-05 6:16 ` Nick Piggin
2004-09-05 10:13 ` Nick Piggin
2004-09-05 17:24 ` Linus Torvalds
2004-09-05 17:36 ` Martin J. Bligh
2004-09-05 17:37 ` Arjan van de Ven
2004-09-05 17:58 ` Linus Torvalds
2004-09-05 18:41 ` Arjan van de Ven [this message]
2004-09-06 1:35 ` Nick Piggin
2004-09-15 13:27 ` Jörn Engel
2004-09-15 13:29 ` Arjan van de Ven
2004-09-15 13:34 ` Jörn Engel
2004-09-15 13:39 ` Arjan van de Ven
2004-09-15 14:18 ` Jörn Engel
2004-09-06 1:09 ` Nick Piggin
2004-09-05 6:09 ` Andrew Morton
2004-09-05 6:26 ` Nick Piggin
2004-09-05 6:27 ` Anton Blanchard
2004-09-05 10:09 ` Nick Piggin
2004-09-06 3:33 ` David S. Miller
2004-09-06 8:55 ` Nick Piggin
2004-09-05 16:49 ` Linus Torvalds
2004-09-06 0:54 ` Nick Piggin
2004-09-06 1:49 ` Nick Piggin
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