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Message-ID: <20100205173422.GA14706@amt.cnet> Date: Fri, 5 Feb 2010 15:34:23 -0200 From: Marcelo Tosatti <mtosatti@...hat.com> To: Andrea Arcangeli <aarcange@...hat.com> Cc: Rik van Riel <riel@...hat.com>, balbir@...ux.vnet.ibm.com, jdike@...toit.com, kvm@...r.kernel.org, linux-kernel@...r.kernel.org, avi@...hat.com Subject: Re: [PATCH] emulate accessed bit for EPT On Thu, Feb 04, 2010 at 06:47:15PM +0100, Andrea Arcangeli wrote: > On Thu, Feb 04, 2010 at 08:40:43AM -0500, Rik van Riel wrote: > > I suspect it won't be very many. I have been monitoring > > /proc/meminfo on my system while testing this patch, and > > it is quite typical that the size of the inactive anon > > list does not change for minutes at a time. > > > > In other words, no pages are moved onto or off of the > > inactive anon list for several minutes. That corresponds > > to a very small number of minor faults introduced by my > > patch. > > When there's light VM pressure, ideally there should be zero overhead > caused by the patch. When there is VM pressure this will avoid some > unnecessary I/O which should outweight the minor faults. It should be > a good default behavior. Agree. But perhaps a module parameter to turn accessed bit emulation off might be handy in the future? -- 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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