From: Andi Kleen <andi@firstfloor.org>
To: "Paul E. McKenney" <paulmck@linux.vnet.ibm.com>
Cc: Andi Kleen <andi@firstfloor.org>,
linux-kernel@vger.kernel.org, mingo@elte.hu,
laijs@cn.fujitsu.com, dipankar@in.ibm.com,
akpm@linux-foundation.org, mathieu.desnoyers@efficios.com,
josh@joshtriplett.org, niv@us.ibm.com, tglx@linutronix.de,
peterz@infradead.org, rostedt@goodmis.org, dhowells@redhat.com,
edumazet@google.com, darren@dvhart.com, fweisbec@gmail.com,
sbw@mit.edu
Subject: Re: [PATCH RFC nohz_full 0/7] v2 Provide infrastructure for full-system idle
Date: Mon, 1 Jul 2013 18:19:10 +0200 [thread overview]
Message-ID: <20130701161910.GN6123@two.firstfloor.org> (raw)
In-Reply-To: <20130701160314.GM3773@linux.vnet.ibm.com>
> I am guessing that you want CONFIG_NO_HZ_FULL to implicitly enable
> the sysidle code so that CONFIG_NO_HZ_FULL_SYSIDLE can be eliminated.
> I will be happy to take that step, but only after I gain full confidence
> in the correctness and performance of the sysidle code.
FWIW if you want useful testing you need to enable it by default
(as part of NO_IDLE_HZ) anyways. Users will most likely pick
whatever is "default" in Kconfig.
> > If you want a switch for testing I would advise a sysctl or sysfs knob
>
> This would work well for the correctness part, but not for the performance
> part.
What performance part?
Are you saying this adds so many checks to hot paths that normal runtime
if() with a flag is too expensive?
-Andi
--
ak@linux.intel.com -- Speaking for myself only.
next prev parent reply other threads:[~2013-07-01 16:19 UTC|newest]
Thread overview: 32+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-06-28 20:09 Paul E. McKenney
2013-06-28 20:10 ` [PATCH RFC nohz_full v2 1/7] nohz_full: Add Kconfig parameter for scalable detection of all-idle state Paul E. McKenney
2013-06-28 20:10 ` [PATCH RFC nohz_full v2 2/7] nohz_full: Add rcu_dyntick data " Paul E. McKenney
2013-07-01 15:31 ` Josh Triplett
2013-07-01 15:52 ` Paul E. McKenney
2013-07-01 18:16 ` Josh Triplett
2013-07-01 18:23 ` Paul E. McKenney
2013-07-01 18:34 ` Josh Triplett
2013-07-01 19:16 ` Paul E. McKenney
2013-07-02 5:10 ` Mike Galbraith
2013-07-02 5:58 ` Paul E. McKenney
2013-06-28 20:10 ` [PATCH RFC nohz_full v2 3/7] nohz_full: Add per-CPU idle-state tracking Paul E. McKenney
2013-07-01 15:33 ` Josh Triplett
2013-06-28 20:10 ` [PATCH RFC nohz_full v2 4/7] nohz_full: Add full-system idle states and variables Paul E. McKenney
2013-06-28 20:10 ` [PATCH RFC nohz_full v2 5/7] nohz_full: Add full-system-idle arguments to API Paul E. McKenney
2013-06-28 20:10 ` [PATCH RFC nohz_full v2 6/7] nohz_full: Add full-system-idle state machine Paul E. McKenney
2013-07-01 16:35 ` Frederic Weisbecker
2013-07-01 18:10 ` Paul E. McKenney
2013-07-01 20:55 ` Frederic Weisbecker
2013-07-01 16:53 ` Frederic Weisbecker
2013-07-01 18:17 ` Paul E. McKenney
2013-07-01 21:38 ` Frederic Weisbecker
2013-07-01 22:51 ` Paul E. McKenney
2013-06-28 20:10 ` [PATCH RFC nohz_full v2 7/7] nohz_full: Force RCU's grace-period kthreads onto timekeeping CPU Paul E. McKenney
2013-07-01 15:19 ` [PATCH RFC nohz_full 0/7] v2 Provide infrastructure for full-system idle Andi Kleen
2013-07-01 16:03 ` Paul E. McKenney
2013-07-01 16:19 ` Andi Kleen [this message]
2013-07-01 19:19 ` Paul E. McKenney
2013-07-01 19:43 ` Christoph Lameter
2013-07-01 19:56 ` Paul E. McKenney
2013-07-01 20:24 ` Christoph Lameter
2013-07-01 20:43 ` Thomas Gleixner
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