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Date: Sat, 31 May 2008 01:13:59 +0100 From: Jeremy Fitzhardinge <jeremy@...p.org> To: Zachary Amsden <zach@...are.com> CC: Ingo Molnar <mingo@...e.hu>, LKML <linux-kernel@...r.kernel.org>, xen-devel <xen-devel@...ts.xensource.com>, Thomas Gleixner <tglx@...utronix.de>, Hugh Dickins <hugh@...itas.com>, kvm-devel <kvm-devel@...ts.sourceforge.net>, Virtualization Mailing List <virtualization@...ts.osdl.org>, Rusty Russell <rusty@...tcorp.com.au>, Peter Zijlstra <a.p.zijlstra@...llo.nl>, Linus Torvalds <torvalds@...ux-foundation.org> Subject: Re: [PATCH 0 of 4] mm+paravirt+xen: add pte read-modify-write abstraction Zachary Amsden wrote: > We don't fault. We write directly to the primary page tables, and clear > the pte just like native. We just issue all mprotect updates in the > queue, and flush the queue when leaving lazy mmu mode. You can't wait > for the TLB flush, you must flush the updates before releasing the > pagetable lock, or you could get misordered updates in an SMP system. > How do you track which ptes need shadow updates? Do you walk the entire pagetable on tlb flush? Or just rebuild the shadow from scratch on demand? J -- 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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