[Acked/cmt] [PATCH Vivid/Wily SRU] x86/xen/p2m: hint at the last populated P2M entry

[Brad Figg]

On Tue, Feb 09, 2016 at 12:40:20PM -0800, Tim Gardner wrote:
> On 02/09/2016 09:47 AM, Andy Whitcroft wrote:
> > On Mon, Feb 08, 2016 at 11:13:09AM -0700, tim.gardner at canonical.com wrote:
> >> From: David Vrabel <david.vrabel at citrix.com>
> >>
> >> BugLink: http://bugs.launchpad.net/bugs/1542941
> >>
> >> With commit 633d6f17cd91ad5bf2370265946f716e42d388c6 (x86/xen: prepare
> >> p2m list for memory hotplug) the P2M may be sized to accomdate a much
> >> larger amount of memory than the domain currently has.
> >>
> >> When saving a domain, the toolstack must scan all the P2M looking for
> >> populated pages.  This results in a performance regression due to the
> >> unnecessary scanning.
> >>
> >> Instead of reporting (via shared_info) the maximum possible size of
> >> the P2M, hint at the last PFN which might be populated.  This hint is
> >> increased as new leaves are added to the P2M (in the expectation that
> >> they will be used for populated entries).
> >>
> >> Signed-off-by: David Vrabel <david.vrabel at citrix.com>
> >> Cc: <stable at vger.kernel.org> # 4.0+
> >> (back ported from commit 98dd166ea3a3c3b57919e20d9b0d1237fcd0349d)
> > 
> > I think that is in a non-standard form.  Using the standard forms helps
> > things like the autotriager which read them.
> > 
> 
> What is standard form ? 'backported' v.s. 'back ported' ?
> -- 
> Tim Gardner tim.gardner at canonical.com
> 
> -- 
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Looking at some of our git repos we have been using "backported".

-- 
Brad Figg brad.figg at canonical.com http://www.canonical.com