From: Dietmar Eggemann <dietmar.eggemann@arm.com>
To: Peter Zijlstra <peterz@infradead.org>
Cc: mingo@kernel.org, linux-kernel@vger.kernel.org, clm@fb.com,
matt@codeblueprint.co.uk, mgalbraith@suse.de, tglx@linutronix.de,
fweisbec@gmail.com
Subject: Re: [RFC][PATCH 4/7] sched: Replace sd_busy/nr_busy_cpus with sched_domain_shared
Date: Mon, 16 May 2016 18:26:00 +0100 [thread overview]
Message-ID: <573A02A8.8030501@arm.com> (raw)
In-Reply-To: <20160516170257.GU3192@twins.programming.kicks-ass.net>
On 16/05/16 18:02, Peter Zijlstra wrote:
> On Mon, May 16, 2016 at 04:31:08PM +0100, Dietmar Eggemann wrote:
>> On 09/05/16 11:48, Peter Zijlstra wrote:
>>
>> Couldn't you just always access sd->shared via
>> sd = rcu_dereference(per_cpu(sd_llc, cpu)) for
>> updating nr_busy_cpus?
>
> Sure; but why would I want to add that extra dereference? Note that in
> the next patch I add more users of sd_llc_shared.
>
I see ... I thought because you do this already in
set_cpu_sd_state_[busy|idle]. But there you need the sd reference to set
sd->nohz_idle already.
next prev parent reply other threads:[~2016-05-16 17:26 UTC|newest]
Thread overview: 39+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-05-09 10:48 [RFC][PATCH 0/7] sched: select_idle_siblings rewrite Peter Zijlstra
2016-05-09 10:48 ` [RFC][PATCH 1/7] sched: Remove unused @cpu argument from destroy_sched_domain*() Peter Zijlstra
2016-05-09 10:48 ` [RFC][PATCH 2/7] sched: Restructure destroy_sched_domain() Peter Zijlstra
2016-05-09 14:46 ` Peter Zijlstra
2016-05-09 10:48 ` [RFC][PATCH 3/7] sched: Introduce struct sched_domain_shared Peter Zijlstra
2016-05-09 10:48 ` [RFC][PATCH 4/7] sched: Replace sd_busy/nr_busy_cpus with sched_domain_shared Peter Zijlstra
2016-05-11 11:55 ` Matt Fleming
2016-05-11 12:33 ` Peter Zijlstra
2016-05-11 18:11 ` Peter Zijlstra
2016-05-11 18:24 ` Peter Zijlstra
2016-05-12 2:05 ` Michael Neuling
2016-05-12 5:07 ` Peter Zijlstra
2016-05-12 11:07 ` Michael Neuling
2016-05-12 11:33 ` Peter Zijlstra
2016-05-13 0:12 ` Michael Neuling
2016-05-16 14:00 ` Peter Zijlstra
2016-05-17 10:20 ` Peter Zijlstra
2016-05-17 10:52 ` Srikar Dronamraju
2016-05-17 11:15 ` Peter Zijlstra
2016-05-11 17:37 ` Peter Zijlstra
2016-05-11 18:04 ` Matt Fleming
2016-05-16 15:31 ` Dietmar Eggemann
2016-05-16 17:02 ` Peter Zijlstra
2016-05-16 17:26 ` Dietmar Eggemann [this message]
2016-05-09 10:48 ` [RFC][PATCH 5/7] sched: Rewrite select_idle_siblings() Peter Zijlstra
2016-05-10 21:05 ` Yuyang Du
2016-05-11 7:00 ` Peter Zijlstra
2016-05-10 23:42 ` Yuyang Du
2016-05-11 7:43 ` Mike Galbraith
2016-05-09 10:48 ` [RFC][PATCH 6/7] sched: Optimize SCHED_SMT Peter Zijlstra
2016-05-09 10:48 ` [RFC][PATCH 7/7] sched: debug muck -- not for merging Peter Zijlstra
2016-05-10 0:50 ` [RFC][PATCH 0/7] sched: select_idle_siblings rewrite Chris Mason
2016-05-11 14:19 ` Chris Mason
2016-05-18 5:51 ` [RFC][PATCH 8/7] sched/fair: Use utilization distance to filter affine sync wakeups Mike Galbraith
2016-05-19 21:43 ` Rik van Riel
2016-05-20 2:52 ` Mike Galbraith
2016-05-25 14:51 ` [RFC][PATCH 0/7] sched: select_idle_siblings rewrite Chris Mason
2016-05-25 16:24 ` Peter Zijlstra
2016-05-25 17:11 ` Chris Mason
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