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Message-ID: <45075F09.5010708@redhat.com> Date: Tue, 12 Sep 2006 21:29:45 -0400 From: Rik van Riel <riel@...hat.com> To: Hubertus Franke <frankeh@...son.ibm.com> CC: Martin Schwidefsky <schwidefsky@...ibm.com>, linux-kernel@...r.kernel.org, virtualization@...ts.osdl.org, akpm@...l.org, nickpiggin@...oo.com.au, rhim@...gateh.edu Subject: Re: [patch 1/9] Guest page hinting: unused / free pages. Hubertus Franke wrote: > Rik van Riel wrote: >> Easy enough to pass a vector of pages to the hypervisor. > > Rik, I thought that what we did. > Martin, I see the code actually does it when the page goes into the > hot/cold > list. I can't remember conciously moving to that. > I thought we had a decent hit on the hot/cold, so that bulking makes sense. > > Then the interface of bulking could be introduced and for s390 it could > internally be implemented as a sequence of ESSA instruction. Note that the transition _to_ volatile can also be batched and done somewhat lazily. For frequently mmaped pages that could end up saving us the transition the other way, too... That could make page hinting very acceptable performance wise, even without a millicode implementation. -- What is important? What you want to be true, or what is true? - 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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