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Date: Tue, 26 Jan 2010 22:38:53 +0100 From: Andrea Arcangeli <aarcange@...hat.com> To: Robin Holt <holt@....com> Cc: Jack Steiner <steiner@....com>, cl@...ux-foundation.org, mingo@...e.hu, tglx@...utronix.de, linux-mm@...ck.org, linux-kernel@...r.kernel.org Subject: Re: [PATCH] - Fix unmap_vma() bug related to mmu_notifiers On Tue, Jan 26, 2010 at 03:29:04PM -0600, Robin Holt wrote: > On Mon, Jan 25, 2010 at 10:16:15PM +0100, Andrea Arcangeli wrote: > > The old patches are in my ftp area, they should still apply, you > > should concentrate testing with those additional ones applied, then it > > will work for xpmem too ;) > > Andrea, could you point me at your ftp area? Sure, this is the very latest version I maintained: http://www.kernel.org/pub/linux/kernel/people/andrea/patches/v2.6/2.6.26-rc7/mmu-notifier-v18/ Note, it may be an option to make mmu notifier sleepable through .config, unless people uses xpmem there is no reason to add refcounting to vmas. That is something we'd pay even if no KVM is used and no mmu notifer is used. I think the ideal is that anon-vma lock should be a rwspinlock and only rcu (no refcounting) with MMU_NOTIFIER_SLEEPABLE=n, and a read-write sem + refcounting if MMU_NOTIFIER_SLEEPABLE=y. MMU_NOTIFIER_SLEEPABLE doesn't need to be user visible, simply XPMEM=y will automatically set MMU_NOTIFIER_SLEEPABLE=y. -- 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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