From: Dario Faggioli <dario.faggioli@citrix.com>
To: Wei Liu <wei.liu2@citrix.com>, Chong Li <lichong659@gmail.com>
Cc: Chong Li <chong.li@wustl.edu>, Sisu Xi <xisisu@gmail.com>,
george.dunlap@eu.citrix.com, xen-devel@lists.xen.org,
Meng Xu <mengxu@cis.upenn.edu>,
jbeulich@suse.com, dgolomb@seas.upenn.edu
Subject: Re: [PATCH v6 for Xen 4.7 1/4] xen: enable per-VCPU parameter settings for RTDS scheduler
Date: Wed, 9 Mar 2016 17:10:04 +0100 [thread overview]
Message-ID: <1457539804.3102.425.camel@citrix.com> (raw)
In-Reply-To: <20160308190950.GT31271@citrix.com>
[-- Attachment #1.1: Type: text/plain, Size: 1128 bytes --]
On Tue, 2016-03-08 at 19:09 +0000, Wei Liu wrote:
> On Sun, Mar 06, 2016 at 11:55:55AM -0600, Chong Li wrote:
>
> > + spin_lock_irqsave(&prv->lock, flags);
> > + svc = rt_vcpu(d->vcpu[local_sched.vcpuid]);
> > + svc->period = period;
> > + svc->budget = budget;
> > + spin_unlock_irqrestore(&prv->lock, flags);
> > +
> And this locking pattern seems sub-optimal. You might be able to move
> the lock and unlock outside the while loop?
>
Yes, unless I'm missing something, that looks possible to me, and would
save a lot of acquire/release ping pong on the lock.
And yet, I'm not sure doing (for large guests) batches of 64 iterations
with (as of now) interrupts disabled.
I'll think about this...
Thanks and Regards,
Dario
--
<<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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next prev parent reply other threads:[~2016-03-09 16:10 UTC|newest]
Thread overview: 51+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-03-06 17:55 [PATCH v6 for Xen 4.7 0/4] Enable per-VCPU parameter settings for RTDS scheduler Chong Li
2016-03-06 17:55 ` [PATCH v6 for Xen 4.7 1/4] xen: enable " Chong Li
2016-03-07 12:59 ` Jan Beulich
2016-03-07 16:28 ` Chong Li
2016-03-07 16:40 ` Jan Beulich
2016-03-07 17:53 ` Dario Faggioli
2016-03-07 22:16 ` Chong Li
2016-03-08 9:10 ` Jan Beulich
2016-03-08 10:34 ` Dario Faggioli
2016-03-08 11:47 ` Jan Beulich
2016-03-08 19:09 ` Wei Liu
2016-03-09 16:10 ` Dario Faggioli [this message]
2016-03-09 16:38 ` Jan Beulich
2016-03-13 17:05 ` Chong Li
2016-03-14 8:37 ` Jan Beulich
2016-03-14 9:10 ` Dario Faggioli
2016-03-14 9:15 ` Jan Beulich
2016-03-14 10:05 ` Dario Faggioli
2016-03-15 16:22 ` Chong Li
2016-03-15 16:41 ` Dario Faggioli
2016-03-15 17:22 ` Chong Li
2016-03-16 3:14 ` Meng Xu
2016-03-16 3:32 ` Chong Li
2016-03-16 3:43 ` Meng Xu
2016-03-16 8:23 ` Dario Faggioli
2016-03-16 14:37 ` Meng Xu
2016-03-16 14:46 ` Chong Li
2016-03-16 14:53 ` Dario Faggioli
2016-03-16 14:46 ` Chong Li
2016-03-16 14:54 ` Dario Faggioli
2016-03-16 10:48 ` Jan Beulich
2016-03-10 22:35 ` Chong Li
2016-03-10 22:50 ` Wei Liu
2016-03-14 9:07 ` Dario Faggioli
2016-03-06 17:55 ` [PATCH v6 for Xen 4.7 2/4] libxc: " Chong Li
2016-03-08 19:09 ` Wei Liu
2016-03-08 19:32 ` Chong Li
2016-03-08 19:36 ` Wei Liu
2016-03-06 17:55 ` [PATCH v6 for Xen 4.7 3/4] libxl: " Chong Li
2016-03-08 19:12 ` Wei Liu
2016-03-09 0:38 ` Chong Li
2016-03-09 14:01 ` Wei Liu
2016-03-09 17:28 ` Dario Faggioli
2016-03-09 21:57 ` Chong Li
2016-03-09 17:09 ` Dario Faggioli
2016-03-09 17:28 ` Dario Faggioli
2016-03-06 17:55 ` [PATCH v6 for Xen 4.7 4/4] xl: " Chong Li
2016-03-08 19:12 ` Wei Liu
2016-03-08 21:24 ` Chong Li
2016-03-09 14:01 ` Wei Liu
2016-03-09 14:09 ` Wei Liu
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