From: Andi Kleen <andi@firstfloor.org>
To: "wassim dagash" <wassim.dagash@gmail.com>
Cc: linux-kernel@vger.kernel.org
Subject: Re: KSWAPD Algorithm
Date: Wed, 03 Dec 2008 15:51:11 +0100 [thread overview]
Message-ID: <87prk9xqg0.fsf@basil.nowhere.org> (raw)
In-Reply-To: <cb94e63d0812022302m341fcdf5wffbca0ec12db426b@mail.gmail.com> (wassim dagash's message of "Wed, 3 Dec 2008 09:02:49 +0200")
"wassim dagash" <wassim.dagash@gmail.com> writes:
> Hi All,
> Description:
> I countered a weird problem with kswapd:
> it runs in some infinite loop trying to swap until order 10 of zone
> highmem is OK, While zone higmem (as I understand) has nothing to do
> with contiguous physical memory (cause there is no 1-1 mapping) which
> means kswapd will continue to try to balance order 10 of zone highmem
> forever (or until someone release a very large chunk of highmem).
> Can anyone please explain me the algorithm of kswapd and why it tries
> to balance order 10 of zone higmem ?
hugetlbfs requires large continuous mappings even in highmem
to map 2MB pages or similar to user space.
However order 10 seems pretty high, normally that's only order 8
on a i386 system.
-Andi
--
ak@linux.intel.com
next prev parent reply other threads:[~2008-12-03 14:51 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-12-03 7:02 KSWAPD Algorithm wassim dagash
2008-12-03 14:51 ` Andi Kleen [this message]
2008-12-04 4:54 ` KAMEZAWA Hiroyuki
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