From: Marcelo Tosatti <mtosatti@redhat.com>
To: Paolo Bonzini <pbonzini@redhat.com>
Cc: Thomas Gleixner <tglx@linutronix.de>,
Rik van Riel <riel@redhat.com>,
linux-kernel@vger.kernel.org,
Luiz Capitulino <lcapitulino@redhat.com>,
Steven Rostedt <srostedt@redhat.com>,
kvm@vger.kernel.org
Subject: Re: [patch -rt 2/2] KVM: lapic: mark LAPIC timer handler as irqsafe
Date: Fri, 5 Dec 2014 14:17:01 -0200 [thread overview]
Message-ID: <20141205161701.GA29003@amt.cnet> (raw)
In-Reply-To: <54806756.30503@redhat.com>
On Thu, Dec 04, 2014 at 02:53:26PM +0100, Paolo Bonzini wrote:
>
>
> On 25/11/2014 21:24, Thomas Gleixner wrote:
> > On Tue, 25 Nov 2014, Rik van Riel wrote:
> >> On 11/25/2014 12:21 PM, Marcelo Tosatti wrote:
> >>> Since lapic timer handler only wakes up a simple waitqueue,
> >>> it can be executed from hardirq context.
> >>>
> >>> Reduces average cyclictest latency by 3us.
> >>
> >> Can this patch be merged in the KVM tree, and go
> >> upstream via Paolo?
> >
> > Not really as it has RT dependencies ....
>
> Can hrtimer_start_expires even return ETIME on a non-RT kernel? If yes,
> I can take patch 2. If not, it's better to keep both patches in the RT
> tree.
>
> Paolo
It can't. We're still evaluating the necessity of this patch, will
resubmit accordingly.
next prev parent reply other threads:[~2014-12-05 16:17 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-11-25 17:21 [patch -rt 0/2] use simple waitqueue for kvm vcpu waitqueue (v2) Marcelo Tosatti
2014-11-25 17:21 ` [patch -rt 1/2] KVM: use simple waitqueue for vcpu->wq Marcelo Tosatti
2014-11-25 18:57 ` Rik van Riel
2014-11-25 19:08 ` Rik van Riel
2014-11-25 19:30 ` Marcelo Tosatti
2014-11-25 20:23 ` Thomas Gleixner
2014-11-25 17:21 ` [patch -rt 2/2] KVM: lapic: mark LAPIC timer handler as irqsafe Marcelo Tosatti
2014-11-25 17:38 ` Paolo Bonzini
2014-11-25 17:38 ` Paolo Bonzini
2014-11-25 19:01 ` Jan Kiszka
2014-12-04 13:43 ` Marcelo Tosatti
2014-11-25 19:11 ` Rik van Riel
2014-11-25 20:24 ` Thomas Gleixner
2014-12-04 13:53 ` Paolo Bonzini
2014-12-04 13:53 ` Paolo Bonzini
2014-12-05 16:17 ` Marcelo Tosatti [this message]
-- strict thread matches above, loose matches on Subject: below --
2015-04-08 23:33 [patch -rt 0/2] use simple waitqueue for kvm vcpu waitqueue (v5) Marcelo Tosatti
2015-04-08 23:33 ` [patch -rt 2/2] KVM: lapic: mark LAPIC timer handler as irqsafe Marcelo Tosatti
2015-01-21 20:36 [patch -rt 0/2] use simple waitqueue for kvm vcpu waitqueue (v4) Marcelo Tosatti
2015-01-21 20:36 ` [patch -rt 2/2] KVM: lapic: mark LAPIC timer handler as irqsafe Marcelo Tosatti
2015-01-14 17:12 [patch -rt 0/2] use simple waitqueue for kvm vcpu waitqueue (v3) Marcelo Tosatti
2015-01-14 17:12 ` [patch -rt 2/2] KVM: lapic: mark LAPIC timer handler as irqsafe Marcelo Tosatti
2015-01-14 18:23 ` Rik van Riel
2014-11-25 16:45 [patch -rt 0/2] use simple waitqueue for kvm vcpu waitqueue Marcelo Tosatti
2014-11-25 16:45 ` [patch -rt 2/2] KVM: lapic: mark LAPIC timer handler as irqsafe Marcelo Tosatti
2014-11-25 17:10 ` Paolo Bonzini
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