From: Peter Zijlstra <peterz@infradead.org>
To: Vincent Guittot <vincent.guittot@linaro.org>
Cc: Morten Rasmussen <morten.rasmussen@arm.com>,
Preeti U Murthy <preeti@linux.vnet.ibm.com>,
"mingo@kernel.org" <mingo@kernel.org>,
"riel@redhat.com" <riel@redhat.com>,
"daniel.lezcano@linaro.org" <daniel.lezcano@linaro.org>,
"srikar@linux.vnet.ibm.com" <srikar@linux.vnet.ibm.com>,
"pjt@google.com" <pjt@google.com>,
"benh@kernel.crashing.org" <benh@kernel.crashing.org>,
"efault@gmx.de" <efault@gmx.de>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"iamjoonsoo.kim@lge.com" <iamjoonsoo.kim@lge.com>,
"svaidy@linux.vnet.ibm.com" <svaidy@linux.vnet.ibm.com>,
"tim.c.chen@linux.intel.com" <tim.c.chen@linux.intel.com>,
"jason.low2@hp.com" <jason.low2@hp.com>
Subject: Re: [PATCH V2] sched: Improve load balancing in the presence of idle CPUs
Date: Mon, 30 Mar 2015 16:01:31 +0200 [thread overview]
Message-ID: <20150330140131.GZ23123@twins.programming.kicks-ass.net> (raw)
In-Reply-To: <CAKfTPtAHAYt2f8EsvW3uWfE+RjaFrJHRGYVmRs+ahyCrAXmOdQ@mail.gmail.com>
On Mon, Mar 30, 2015 at 03:29:09PM +0200, Vincent Guittot wrote:
> On 30 March 2015 at 14:24, Peter Zijlstra <peterz@infradead.org> wrote:
> > @@ -7647,6 +7648,8 @@ static void nohz_idle_balance(struct rq *this_rq, enum cpu_idle_type idle)
> > break;
> >
> > rq = cpu_rq(balance_cpu);
> > + if (rq == this_rq)
> > + done = true;
>
> AFAICT, this can't happen because we start the for_each _cpu loop with:
> if (balance_cpu == this_cpu || !idle_cpu(balance_cpu))
> continue;
Oh hey, look at me being blind ;-)
next prev parent reply other threads:[~2015-03-30 14:01 UTC|newest]
Thread overview: 33+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-03-26 13:02 Preeti U Murthy
2015-03-26 17:03 ` Jason Low
2015-03-27 2:12 ` Wanpeng Li
2015-03-27 4:33 ` Preeti U Murthy
2015-03-27 4:23 ` Wanpeng Li
2015-03-27 5:01 ` Jason Low
2015-03-27 5:07 ` Jason Low
2015-03-27 5:39 ` Srikar Dronamraju
2015-03-27 7:00 ` Wanpeng Li
2015-03-27 6:43 ` Wanpeng Li
2015-03-27 16:23 ` Preeti U Murthy
2015-03-27 11:43 ` [tip:sched/core] " tip-bot for Preeti U Murthy
2015-03-27 13:03 ` [PATCH V2] " Srikar Dronamraju
2015-03-27 14:38 ` Morten Rasmussen
2015-03-27 16:46 ` Preeti U Murthy
2015-03-27 17:56 ` Morten Rasmussen
2015-03-30 7:26 ` Preeti U Murthy
2015-03-30 11:30 ` Morten Rasmussen
2015-03-30 11:06 ` Peter Zijlstra
2015-03-30 12:03 ` Morten Rasmussen
2015-03-30 12:24 ` Peter Zijlstra
2015-03-30 12:54 ` Peter Zijlstra
2015-03-30 13:29 ` Vincent Guittot
2015-03-30 14:01 ` Peter Zijlstra [this message]
2015-03-30 15:27 ` Morten Rasmussen
2015-03-31 8:58 ` Preeti U Murthy
2015-03-31 17:30 ` Jason Low
2015-04-01 6:28 ` Preeti U Murthy
2015-04-01 13:03 ` Morten Rasmussen
2015-04-02 0:55 ` Jason Low
2015-04-02 3:22 ` Preeti U Murthy
2015-03-30 13:45 ` Vincent Guittot
2015-03-31 8:06 ` Preeti U Murthy
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