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Message-ID: <87wrwd9hqm.fsf@basil.nowhere.org> Date: Mon, 12 Apr 2010 10:50:57 +0200 From: Andi Kleen <andi@...stfloor.org> To: Taras Glek <tglek@...illa.com> Cc: linux-kernel@...r.kernel.org Subject: Re: Downsides to madvise/fadvise(willneed) for application startup Taras Glek <tglek@...illa.com> writes: > Hello, > I am working on improving Mozilla startup times. It turns out that > page faults(caused by lack of cooperation between user/kernelspace) > are the main cause of slow startup. I need some insights from someone > who understands linux vm behavior. I have an older patch to create dynamic bitmaps based on the last run and only prefetch those pages. It wasn't entirely a win for everything and didn't work for shared libraries, but with some additional tuning the approach still has potential I think, by combining memory saving with prefetching. ftp://firstfloor.org/pub/ak/pbitmap/INTRO http://halobates.de/dp2.pdf For your use case the algorithm would likely need some glibc support. -Andi -- ak@...ux.intel.com -- Speaking for myself only. -- 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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