From: Frederic Weisbecker <fweisbec@gmail.com>
To: Peter Zijlstra <peterz@infradead.org>
Cc: Ingo Molnar <mingo@kernel.org>,
LKML <linux-kernel@vger.kernel.org>,
Alessio Igor Bogani <abogani@kernel.org>,
Andrew Morton <akpm@linux-foundation.org>,
Chris Metcalf <cmetcalf@tilera.com>,
Christoph Lameter <cl@linux.com>,
Geoff Levand <geoff@infradead.org>,
Gilad Ben Yossef <gilad@benyossef.com>,
Hakan Akkan <hakanakkan@gmail.com>,
Li Zhong <zhong@linux.vnet.ibm.com>,
Namhyung Kim <namhyung.kim@lge.com>,
"Paul E. McKenney" <paulmck@linux.vnet.ibm.com>,
Paul Gortmaker <paul.gortmaker@windriver.com>,
Steven Rostedt <rostedt@goodmis.org>,
Thomas Gleixner <tglx@linutronix.de>,
Paul Turner <pjt@google.com>, Mike Galbraith <efault@gmx.de>
Subject: Re: [RFC GIT PULL] nohz: Full dynticks rq clock handling
Date: Thu, 11 Apr 2013 17:11:13 +0200 [thread overview]
Message-ID: <20130411151109.GC15699@somewhere> (raw)
In-Reply-To: <1365589603.30071.37.camel@laptop>
On Wed, Apr 10, 2013 at 12:26:43PM +0200, Peter Zijlstra wrote:
>
> Another thing I just noticed; our update_curr() assumes its called at
> least once every 4 odd seconds (2^32 ns like).
>
> update_curr() is 'required' for things like task runtime stats and
> everything that hangs off of that like cputimers etc.
>
> Now I'm not entirely sure how the nr_running==1 nohz case deals with
> this, but I can imagine it might take a while. In this case we might
> need to 'fix' update_curr() to not asume the time delta fits in 32
> bits.
>
Good catch, this is not handled yet.
prev parent reply other threads:[~2013-04-11 15:11 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-04-06 16:45 [RFC GIT PULL] nohz: Full dynticks rq clock handling Frederic Weisbecker
2013-04-06 16:45 ` [PATCH 1/7] sched: Update rq clock on nohz CPU before migrating tasks Frederic Weisbecker
2013-04-08 11:48 ` Ingo Molnar
2013-04-09 9:13 ` Peter Zijlstra
2013-04-09 13:11 ` Frederic Weisbecker
2013-04-06 16:45 ` [PATCH 2/7] sched: Update rq clock on nohz CPU before setting fair group shares Frederic Weisbecker
2013-04-09 9:26 ` Peter Zijlstra
2013-04-09 13:21 ` Frederic Weisbecker
2013-04-10 7:05 ` Peter Zijlstra
2013-04-10 10:06 ` Ingo Molnar
2013-04-10 11:02 ` Peter Zijlstra
2013-04-10 11:06 ` Ingo Molnar
2013-04-10 11:47 ` Peter Zijlstra
2013-04-10 11:50 ` Ingo Molnar
2013-04-06 16:45 ` [PATCH 3/7] sched: Update rq clock on tickless CPUs before calling check_preempt_curr() Frederic Weisbecker
2013-04-09 13:18 ` Peter Zijlstra
2013-04-09 16:53 ` Frederic Weisbecker
2013-04-06 16:45 ` [PATCH 4/7] sched: Update rq clock earlier in unthrottle_cfs_rq Frederic Weisbecker
2013-04-06 16:45 ` [PATCH 5/7] sched: Update rq clock before idle balancing Frederic Weisbecker
2013-04-06 16:45 ` [PATCH 6/7] sched: Use an accessor to read rq clock Frederic Weisbecker
2013-04-06 16:46 ` [PATCH 7/7] sched: Debug nohz " Frederic Weisbecker
2013-04-10 10:26 ` [RFC GIT PULL] nohz: Full dynticks rq clock handling Peter Zijlstra
2013-04-10 10:29 ` Ingo Molnar
2013-04-11 15:11 ` Frederic Weisbecker [this message]
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