From: Frederic Weisbecker <fweisbec@gmail.com>
To: "Paul E. McKenney" <paulmck@linux.vnet.ibm.com>
Cc: LKML <linux-kernel@vger.kernel.org>,
Ingo Molnar <mingo@kernel.org>,
Peter Zijlstra <peterz@infradead.org>,
Steven Rostedt <rostedt@goodmis.org>,
Thomas Gleixner <tglx@linutronix.de>,
Viresh Kumar <viresh.kumar@linaro.org>
Subject: Re: [PATCH 06/10] nohz: Define meaningful symbol for nohz full timekeeper
Date: Fri, 25 Jul 2014 23:27:07 +0200 [thread overview]
Message-ID: <20140725212705.GB16182@localhost.localdomain> (raw)
In-Reply-To: <20140721181255.GH8690@linux.vnet.ibm.com>
On Mon, Jul 21, 2014 at 11:12:55AM -0700, Paul E. McKenney wrote:
> On Sat, Jul 19, 2014 at 02:44:17AM +0200, Frederic Weisbecker wrote:
> > The nohz full timekeeper is always CPU 0. Lets add it to the list of
> > special tick_do_timer_cpu symbols for more self explanatory code.
> >
> > Cc: Ingo Molnar <mingo@kernel.org>
> > Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
> > Cc: Peter Zijlstra <peterz@infradead.org>
> > Cc: Steven Rostedt <rostedt@goodmis.org>
> > Cc: Thomas Gleixner <tglx@linutronix.de>
> > Cc: Viresh Kumar <viresh.kumar@linaro.org>
> > Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
>
> Sounds like Nicolas Pitre would like to be able to specify the default,
> perhaps at build time, but aside from that requested enhancement:
Ok. That's outside the scope of this patchset though as it doesn't change much things
in this regard: CPU 0 has been the timekeeper since the early days of nohz full.
And we still need a default timekeeper in any case, whether we can override it or not
in the future. So we still need that patch.
Then if big.LITTLE people are really interested in nohz full, we can still enhance
that in the future.
Thanks!
next prev parent reply other threads:[~2014-07-25 21:27 UTC|newest]
Thread overview: 29+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-07-19 0:44 [RFC PATCH 00/10] nohz: Support sysidle (and some more cleanups) Frederic Weisbecker
2014-07-19 0:44 ` [PATCH 01/10] irq_work: Introduce void irq work Frederic Weisbecker
2014-07-21 18:16 ` Paul E. McKenney
2014-07-19 0:44 ` [PATCH 02/10] nohz: Kick full dynticks timer targets with an empty IPI Frederic Weisbecker
2014-07-19 7:19 ` Peter Zijlstra
2014-07-19 13:18 ` Frederic Weisbecker
2014-07-19 13:47 ` Peter Zijlstra
2014-07-19 13:54 ` Frederic Weisbecker
2014-07-19 0:44 ` [PATCH 03/10] rcu: Kick full dynticks CPU on extended grace period with a void IRQ Frederic Weisbecker
2014-07-21 18:16 ` Paul E. McKenney
2014-07-19 0:44 ` [PATCH 04/10] nohz: Appropriate timekeeper kick on sysidle break Frederic Weisbecker
2014-07-21 18:15 ` Paul E. McKenney
2014-07-19 0:44 ` [PATCH 05/10] smp: Fast path check on IPI list Frederic Weisbecker
2014-07-19 0:44 ` [PATCH 06/10] nohz: Define meaningful symbol for nohz full timekeeper Frederic Weisbecker
2014-07-21 18:11 ` Paul E. McKenney
2014-07-21 18:12 ` Paul E. McKenney
2014-07-25 21:27 ` Frederic Weisbecker [this message]
2014-07-19 0:44 ` [PATCH 07/10] nohz: Enforce timekeeping on CPU 0 Frederic Weisbecker
2014-07-19 17:31 ` Nicolas Pitre
2014-07-19 18:31 ` Peter Zijlstra
2014-07-19 18:46 ` Nicolas Pitre
2014-07-19 19:45 ` Peter Zijlstra
2014-07-20 1:07 ` Frederic Weisbecker
2014-07-19 0:44 ` [PATCH 08/10] nohz: Fetch timekeeping max deferment only for timekeeper Frederic Weisbecker
2014-07-19 0:44 ` [PATCH 09/10] nohz: Switch nohz full timekeeper to dynticks idle on top of sysidle detection Frederic Weisbecker
2014-07-21 17:50 ` Paul E. McKenney
2014-07-19 0:44 ` [PATCH 10/10] nohz: Warn on illegal timekeeper switch in nohz full Frederic Weisbecker
2014-07-21 17:51 ` Paul E. McKenney
2014-07-28 17:37 [PATCH 00/10] nohz: Support sysidle (+ some more nohz kick cleanups) Frederic Weisbecker
2014-07-28 17:37 ` [PATCH 06/10] nohz: Define meaningful symbol for nohz full timekeeper Frederic Weisbecker
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