From: CAI Qian <caiqian@redhat.com>
To: Hugh Dickins <hughd@google.com>
Cc: linux-mm <linux-mm@kvack.org>
Subject: Re: understand KSM
Date: Tue, 26 Oct 2010 07:14:29 -0400 (EDT) [thread overview]
Message-ID: <862326461.384731288091669063.JavaMail.root@zmail06.collab.prod.int.phx2.redhat.com> (raw)
In-Reply-To: <alpine.LSU.2.00.1010260045120.2939@sister.anvils>
> > There are 3 programs (A, B ,C) to allocate 128M memory each using
> KSM.
> >
> > A has memory content equal 'c'.
> > B has memory content equal 'a'.
> > C has memory content equal 'a'.
> >
> > Then (using the latest mmotm tree),
> > pages_shared = 2
> > pages_sharing = 98292
> > pages_unshared = 0
>
> So, after KSM has done its best, it all reduces to 1 page full of
> 'a's and another 1 page full of 'c's.
I would expect pages_sharing to be 98302 (128 * 256 - 2), but this one looks unstable. Increased pages_to_scan to 2 * 98304 did not help either.
Thanks for the other suggestions! After modified the test accordingly, it looks like work as expected.
CAI Qian
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next prev parent reply other threads:[~2010-10-26 11:17 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <356409918.247361287997619777.JavaMail.root@zmail06.collab.prod.int.phx2.redhat.com>
2010-10-25 9:11 ` understand KSM caiqian
2010-10-26 8:03 ` Hugh Dickins
2010-10-26 11:14 ` CAI Qian [this message]
2010-10-27 4:00 ` Hugh Dickins
[not found] <395413139.534301288167215758.JavaMail.root@zmail06.collab.prod.int.phx2.redhat.com>
2010-10-27 8:16 ` caiqian
2010-11-09 6:48 ` Hugh Dickins
2010-11-10 9:25 ` CAI Qian
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