From: Andrew Cooper <andrew.cooper3@citrix.com>
To: Jan Beulich <JBeulich@suse.com>,
xen-devel <xen-devel@lists.xenproject.org>
Cc: George Dunlap <George.Dunlap@eu.citrix.com>
Subject: Re: [PATCH] x86/PoD: skip eager reclaim when possible
Date: Tue, 10 May 2016 14:50:24 +0100 [thread overview]
Message-ID: <5731E720.9050104@citrix.com> (raw)
In-Reply-To: <573201D202000078000EA201@prv-mh.provo.novell.com>
On 10/05/16 14:44, Jan Beulich wrote:
> Reclaiming pages is pointless when the cache can already satisfy all
> outstanding PoD entries, and doing reclaims in that case can be very
> harmful to performance when that memory gets used by the guest, but
> only to store zeroes there.
>
> Signed-off-by: Jan Beulich <jbeulich@suse.com>
Reviewed-by: Andrew Cooper <andrew.cooper3@citrix.com>
Possibly worth mentioning a dd from /dev/zero as the most likely action
to trigger this.
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next prev parent reply other threads:[~2016-05-10 14:06 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-05-10 13:44 [PATCH] x86/PoD: skip eager reclaim when possible Jan Beulich
2016-05-10 13:49 ` Jan Beulich
2016-05-10 14:18 ` Wei Liu
2016-05-10 13:50 ` Andrew Cooper [this message]
2016-05-10 14:27 ` Jan Beulich
2016-05-12 14:40 ` George Dunlap
2016-05-12 15:08 ` Jan Beulich
2016-05-12 15:19 ` George Dunlap
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