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Message-ID: <87prk9xqg0.fsf@basil.nowhere.org> Date: Wed, 03 Dec 2008 15:51:11 +0100 From: Andi Kleen <andi@...stfloor.org> To: "wassim dagash" <wassim.dagash@...il.com> Cc: linux-kernel@...r.kernel.org Subject: Re: KSWAPD Algorithm "wassim dagash" <wassim.dagash@...il.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@...ux.intel.com -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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