From: "Jan Beulich" <JBeulich@suse.com>
To: Chong Li <lichong659@gmail.com>
Cc: Chong Li <chong.li@wustl.edu>, Sisu Xi <xisisu@gmail.com>,
George Dunlap <george.dunlap@eu.citrix.com>,
Dario Faggioli <dario.faggioli@citrix.com>,
xen-devel <xen-devel@lists.xen.org>,
Meng Xu <mengxu@cis.upenn.edu>,
Dagaen Golomb <dgolomb@seas.upenn.edu>
Subject: Re: [PATCH v7 for Xen 4.7 1/4] xen: enable per-VCPU parameter settings for RTDS scheduler
Date: Fri, 18 Mar 2016 01:39:21 -0600 [thread overview]
Message-ID: <56EBBEB902000078000DE315@prv-mh.provo.novell.com> (raw)
In-Reply-To: <CAGHO-ioEhHuirZFGRW5RDzZ+CBvf_sO-AxmjrWyL-cZAKNWdTA@mail.gmail.com>
>>> On 17.03.16 at 21:42, <lichong659@gmail.com> wrote:
> On Thu, Mar 17, 2016 at 5:03 AM, Dario Faggioli
> <dario.faggioli@citrix.com> wrote:
>> On Wed, 2016-03-16 at 11:47 -0500, Chong Li wrote:
>
>>
>>> --- a/xen/common/sched_rt.c
>>> +++ b/xen/common/sched_rt.c
>>> @@ -1129,24 +1145,22 @@ rt_dom_cntl(
>>> struct vcpu *v;
>>> unsigned long flags;
>>> int rc = 0;
>>> + xen_domctl_schedparam_vcpu_t local_sched;
>>> + s_time_t period, budget;
>>> + uint32_t index = 0;
>>>
>>> switch ( op->cmd )
>>> {
>>> case XEN_DOMCTL_SCHEDOP_getinfo:
>>> - if ( d->max_vcpus > 0 )
>>> - {
>>> - spin_lock_irqsave(&prv->lock, flags);
>>> - svc = rt_vcpu(d->vcpu[0]);
>>> - op->u.rtds.period = svc->period / MICROSECS(1);
>>> - op->u.rtds.budget = svc->budget / MICROSECS(1);
>>> - spin_unlock_irqrestore(&prv->lock, flags);
>>> - }
>>> - else
>>> - {
>>> - /* If we don't have vcpus yet, let's just return the
>>> defaults. */
>>> - op->u.rtds.period = RTDS_DEFAULT_PERIOD;
>>> - op->u.rtds.budget = RTDS_DEFAULT_BUDGET;
>>> - }
>>> + /* Return the default parameters.
>>> + * A previous bug fixed here:
>>> + * The default PERIOD or BUDGET should be divided by
>>> MICROSECS(1),
>>> + * before returned to upper caller.
>>> + */
>> Comment style (missing opening '/*').
>>
>> Also, putting this kind of things in comments is not at all ideal. If
>> doing this in this patch, you should mention it in the changelog. Or
>> you do it in a separate patch (that you put before this one in the
>> series).
>>
>> I'd say that, in this specific case, is not a big deal which one of the
>> two approaches you take (mentioning or separate patch), but the having
>> a separate one is indeed almost always preferable (e.g., the fix can be
>> backported).
>
> If I choose mentioning, do I move the comment to the changelog? Or do I keep
> it here and say it again in the changelog?
Just consider what would happen if everyone mentioned in
comments the bugs they fixed. I think the answer to you question
is obvious then...
Jan
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next prev parent reply other threads:[~2016-03-18 7:39 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-03-16 16:47 [PATCH v7 for Xen 4.7 0/4] Enable per-VCPU parameter settings for RTDS scheduler Chong Li
2016-03-16 16:47 ` [PATCH v7 for Xen 4.7 1/4] xen: enable " Chong Li
2016-03-17 10:03 ` Dario Faggioli
2016-03-17 20:42 ` Chong Li
2016-03-18 7:39 ` Jan Beulich [this message]
2016-03-18 10:47 ` Dario Faggioli
2016-03-18 20:22 ` Chong Li
2016-03-18 7:48 ` Jan Beulich
2016-03-16 16:47 ` [PATCH v7 for Xen 4.7 2/4] libxc: " Chong Li
2016-03-16 19:24 ` Wei Liu
2016-03-17 2:28 ` Dario Faggioli
2016-03-16 16:47 ` [PATCH v7 for Xen 4.7 3/4] libxl: " Chong Li
2016-03-16 19:24 ` Wei Liu
2016-03-17 4:05 ` Dario Faggioli
2016-03-17 19:50 ` Chong Li
2016-03-18 9:17 ` Dario Faggioli
2016-03-17 4:29 ` Dario Faggioli
2016-03-16 16:47 ` [PATCH v7 for Xen 4.7 4/4] xl: " Chong Li
2016-03-16 19:24 ` Wei Liu
2016-03-16 19:29 ` Wei Liu
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