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Date: Sun, 8 Nov 2009 14:05:21 +0100 From: Ingo Molnar <mingo@...e.hu> To: Avi Kivity <avi@...hat.com> Cc: Gleb Natapov <gleb@...hat.com>, kvm@...r.kernel.org, linux-mm@...ck.org, linux-kernel@...r.kernel.org, "H. Peter Anvin" <hpa@...or.com>, Thomas Gleixner <tglx@...utronix.de>, Fr??d??ric Weisbecker <fweisbec@...il.com> Subject: Re: [PATCH 02/11] Add "handle page fault" PV helper. * Avi Kivity <avi@...hat.com> wrote: > On 11/08/2009 02:51 PM, Ingo Molnar wrote: > >>Maybe we should generalize paravirt-ops patching in case if (x) f() is > >>deemed too expensive. > >Yes, that's a nice idea. We have quite a number of 'conditional > >callbacks' in various critical paths that could be made lighter via such > >a technique. > > > > It would also free new callbacks from the 'it increases overhead > > even if unused' criticism and made it easier to add them. > > We can take the "immediate values" infrastructure as a first step. Has > that been merged? No, there were doubts about whether patching in live instructions like that is safe on all CPU types. Ingo -- 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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