From: Thomas Gleixner <tglx@linutronix.de>
To: David Vrabel <david.vrabel@citrix.com>
Cc: xen-devel@lists.xen.org,
Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>,
LKML <linux-kernel@vger.kernel.org>,
John Stultz <john.stultz@linaro.org>,
Ingo Molnar <mingo@kernel.org>,
Peter Zijlstra <peterz@infradead.org>
Subject: Re: [PATCH 1/4] hrtimers: provide a hrtimers_late_resume() call
Date: Fri, 21 Jun 2013 23:24:00 +0200 (CEST) [thread overview]
Message-ID: <alpine.DEB.2.02.1306212321440.4013@ionos.tec.linutronix.de> (raw)
In-Reply-To: <51C48DA3.4010307@citrix.com>
On Fri, 21 Jun 2013, David Vrabel wrote:
> On 21/06/13 15:32, Thomas Gleixner wrote:
> However, since hrtimers require the use of a one-shot ticker and when
> one-shot timers are resumed they are armed to fire immediately (see
> tick_resume_oneshot()) this interrupt is sufficient to kick the require
> softirq.
>
> So, as proposed before:
>
> hrtimers_resume()
> {
> /* This CPU's tick is armed to fire immediately by
> tick_oneshot_resume(). Just need raise a softirq to program
> the timers on all CPUs. */
> cpu_base->clock_was_set = 1;
> __raise_softirq_irqoff(HRTIMER_SOFTIRQ);
> }
>
> Do you agree or disagree?
Fair enough. I did not think about that. With the comment in place it
is clear. It might be a bit more elaborate for the casual reader.
Thanks,
tglx
next prev parent reply other threads:[~2013-06-21 21:24 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-06-20 19:16 [PATCHv5 0/4] xen: maintain an accurate persistent clock in more cases David Vrabel
2013-06-20 19:16 ` [PATCH 1/4] hrtimers: provide a hrtimers_late_resume() call David Vrabel
2013-06-21 7:53 ` Thomas Gleixner
2013-06-21 12:32 ` David Vrabel
2013-06-21 14:32 ` Thomas Gleixner
2013-06-21 17:30 ` David Vrabel
2013-06-21 21:24 ` Thomas Gleixner [this message]
2013-06-20 19:16 ` [PATCH 2/4] time: add a notifier chain for when the system time is stepped David Vrabel
2013-06-21 7:57 ` Thomas Gleixner
2013-06-21 12:41 ` David Vrabel
2013-06-21 23:06 ` Thomas Gleixner
2013-06-24 10:51 ` David Vrabel
2013-06-24 16:30 ` Thomas Gleixner
2013-06-24 17:00 ` David Vrabel
2013-06-24 17:50 ` John Stultz
2013-06-24 19:55 ` Thomas Gleixner
2013-06-21 16:22 ` John Stultz
2013-06-20 19:16 ` [PATCH 3/4] x86/xen: sync the wallclock " David Vrabel
2013-06-20 19:16 ` [PATCH 4/4] x86/xen: sync the CMOS RTC as well as the Xen wallclock David Vrabel
2013-06-20 20:03 ` [PATCHv5 0/4] xen: maintain an accurate persistent clock in more cases John Stultz
2013-06-21 18:31 ` Konrad Rzeszutek Wilk
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