From: Andrea Arcangeli <aarcange@redhat.com>
To: Rik van Riel <riel@redhat.com>
Cc: balbir@linux.vnet.ibm.com, jdike@addtoit.com,
kvm@vger.kernel.org, linux-kernel@vger.kernel.org,
avi@redhat.com, mtosatti@redhat.com
Subject: Re: [PATCH] emulate accessed bit for EPT
Date: Thu, 4 Feb 2010 18:47:15 +0100 [thread overview]
Message-ID: <20100204174715.GL5959@random.random> (raw)
In-Reply-To: <4B6ACE5B.9080601@redhat.com>
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.
next prev parent reply other threads:[~2010-02-04 17:47 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-02-03 21:11 [PATCH] emulate accessed bit for EPT Rik van Riel
2010-02-04 4:12 ` Balbir Singh
2010-02-04 13:40 ` Rik van Riel
2010-02-04 15:30 ` Balbir Singh
2010-02-04 15:41 ` Rik van Riel
2010-02-04 15:52 ` Balbir Singh
2010-02-04 17:47 ` Andrea Arcangeli [this message]
2010-02-05 17:34 ` Marcelo Tosatti
2010-02-05 18:14 ` Andrea Arcangeli
2010-02-07 19:21 ` Marcelo Tosatti
2010-02-04 16:17 ` Jeff Dike
2010-02-08 10:27 ` Avi Kivity
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