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From: Wanpeng Li <kernellwp@gmail.com>
To: Thomas Gleixner <tglx@linutronix.de>
Cc: LKML <linux-kernel@vger.kernel.org>,
	Ingo Molnar <mingo@kernel.org>,
	Peter Zijlstra <peterz@infradead.org>,
	Ingo Molnar <mingo@redhat.com>, kvm <kvm@vger.kernel.org>,
	Frederic Weisbecker <frederic@kernel.org>
Subject: Re: [PATCH v2] sched/nohz: Optimize get_nohz_timer_target()
Date: Mon, 13 Jan 2020 09:32:06 +0800	[thread overview]
Message-ID: <CANRm+CyGWvY767ER14EqWAZakZu3S0KL=X5PT7Pyu=ezVZZoag@mail.gmail.com> (raw)
In-Reply-To: <87a76v8knv.fsf@nanos.tec.linutronix.de>

On Fri, 10 Jan 2020 at 22:12, Thomas Gleixner <tglx@linutronix.de> wrote:
>
> Wanpeng,
>
> Wanpeng Li <kernellwp@gmail.com> writes:
>
> > Hi Thomas,
> > On Wed, 23 Oct 2019 at 16:29, Thomas Gleixner <tglx@linutronix.de> wrote:
> >>
> >> On Wed, 23 Oct 2019, Wanpeng Li wrote:
> >> > I didn't see your refactor to get_nohz_timer_target() which you
> >> > mentioned in IRC after four months, I can observe cyclictest drop from
> >> > 4~5us to 8us in kvm guest(we offload the lapic timer emulation to
> >> > housekeeping cpu to avoid timer fire external interrupt on the pCPU
> >> > which vCPU resident incur a vCPU vmexit) w/o this patch in the case of
> >> > there is no busy housekeeping cpu. The score can be recovered after I
> >> > give stress to create a busy housekeeping cpu.
> >> >
> >> > Could you consider applying this patch for temporary since I'm not
> >> > sure when the refactor can be ready.
> >>
> >> Yeah. It's delayed (again).... Will pick that up.
> >
> > I didn't find WIP tag for this work after ~half year since v4 was
> > posted https://lkml.org/lkml/2019/6/28/231 Could you apply this patch
> > for temporary because the completion time of refactor is not
> > deterministic.
>
> Could you please repost it?

Just repost, thanks Thomas.

    Wanpeng

      reply	other threads:[~2020-01-13  1:32 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <1561682593-12071-1-git-send-email-wanpengli@tencent.com>
     [not found] ` <20190628011012.GA19488@lerouge>
2019-10-23  8:16   ` [PATCH v2] sched/nohz: Optimize get_nohz_timer_target() Wanpeng Li
2019-10-23  8:29     ` Thomas Gleixner
2019-10-23  9:25       ` Wanpeng Li
2020-01-06  6:21       ` Wanpeng Li
2020-01-10 14:12         ` Thomas Gleixner
2020-01-13  1:32           ` Wanpeng Li [this message]

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