From mboxrd@z Thu Jan  1 00:00:00 1970
From: Dario Faggioli <dario.faggioli@citrix.com>
Subject: Re: [PATCH v10 6/7] vmx: VT-d posted-interrupt core
	logic handling
Date: Wed, 20 Jan 2016 14:30:46 +0100
Message-ID: <1453296646.3116.33.camel@citrix.com>
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To: Jan Beulich <JBeulich@suse.com>, Feng Wu <feng.wu@intel.com>
Cc: George Dunlap <george.dunlap@eu.citrix.com>, Andrew Cooper <andrew.cooper3@citrix.com>, Kevin Tian <kevin.tian@intel.com>, Keir Fraser <keir@xen.org>, "xen-devel@lists.xen.org" <xen-devel@lists.xen.org>
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On Wed, 2016-01-20 at 04:35 -0700, Jan Beulich wrote:
> > > > On 20.01.16 at 12:20, <feng.wu@intel.com> wrote:
> > >=C2=A0
> > > Then you didn't understand: The question isn't this path, but the
> > > path where the hook gets called if non-NULL (and hence the
> > > possibility to avoid such needless calls).
> >=20
> > I understand you mean the overhead happens when the hooks
> > is called. My point is the hook is not called in a critical path,
> > so I doubt
> > whether it worth doing so to make the logic complex.
>=20
> Are you sure scheduling code is not a critical path?
>=20
TBH, I like Jan's point... It's always good to make all we can to avoid
calling the hook, if unnecessary.

Does it really complicates things a lot? Feng, can you give it a try?

Regards,
Dario
--=20
<<This happens because I choose it to happen!>> (Raistlin Majere)
-----------------------------------------------------------------
Dario Faggioli, Ph.D, http://about.me/dario.faggioli
Senior Software Engineer, Citrix Systems R&D Ltd., Cambridge (UK)


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