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Re: [RFC PATCH 4/4] sched: Upload nohz full CPU load on task enqueue/dequeue

From Frederic Weisbecker <fweisbec@gmail.com>
Newsgroups linux.kernel
Subject Re: [RFC PATCH 4/4] sched: Upload nohz full CPU load on task enqueue/dequeue
Date 2016-01-20 17:50 +0100
Message-ID <qT47h-Ma-35@gated-at.bofh.it> (permalink)
References (2 earlier) <qSWW6-4hT-15@gated-at.bofh.it> <qT25s-7Pe-23@gated-at.bofh.it> <qT2f8-7Ty-45@gated-at.bofh.it> <qT47g-Ma-13@gated-at.bofh.it> <qT47g-Ma-11@gated-at.bofh.it>
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On Wed, Jan 20, 2016 at 10:42:56AM -0600, Christoph Lameter wrote:
> On Wed, 20 Jan 2016, Frederic Weisbecker wrote:
> 
> > > So we agreed long time ago, that we first fix the issues with s single task
> > > running undisturbed in user space, i.e. tickless. Those issues have never been
> > > resolved fully, but now you try to add more complexity of extra runnable
> > > tasks, nohz tasks sleeping and whatever.
> >
> > Nohz tasks do sleep, really, at least we need to handle that case now.
> 
> Sleep meaning call into the OS to be put to sleep?

Indeed, when the task has finished its work, it goes to sleep, right?

> Why would NOHZ be active then?

It's active when the task active.

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Re: [RFC PATCH 4/4] sched: Upload nohz full CPU load on task  enqueue/dequeue Thomas Gleixner <tglx@linutronix.de> - 2016-01-20 10:10 +0100
  Re: [RFC PATCH 4/4] sched: Upload nohz full CPU load on task  enqueue/dequeue Frederic Weisbecker <fweisbec@gmail.com> - 2016-01-20 15:40 +0100
    Re: [RFC PATCH 4/4] sched: Upload nohz full CPU load on task  enqueue/dequeue Thomas Gleixner <tglx@linutronix.de> - 2016-01-20 15:50 +0100
      Re: [RFC PATCH 4/4] sched: Upload nohz full CPU load on task  enqueue/dequeue Christoph Lameter <cl@linux.com> - 2016-01-20 17:50 +0100
        Re: [RFC PATCH 4/4] sched: Upload nohz full CPU load on task  enqueue/dequeue Frederic Weisbecker <fweisbec@gmail.com> - 2016-01-20 17:50 +0100
      Re: [RFC PATCH 4/4] sched: Upload nohz full CPU load on task  enqueue/dequeue Frederic Weisbecker <fweisbec@gmail.com> - 2016-01-20 17:50 +0100

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