From: Wanpeng Li <wanpeng.li@linux.intel.com>
To: Srikar Dronamraju <srikar@linux.vnet.ibm.com>
Cc: Jason Low <jason.low2@hp.com>,
Wanpeng Li <wanpeng.li@linux.intel.com>,
Preeti U Murthy <preeti@linux.vnet.ibm.com>,
peterz@infradead.org, mingo@kernel.org, riel@redhat.com,
daniel.lezcano@linaro.org, vincent.guittot@linaro.org,
pjt@google.com, benh@kernel.crashing.org, efault@gmx.de,
linux-kernel@vger.kernel.org, iamjoonsoo.kim@lge.com,
svaidy@linux.vnet.ibm.com, tim.c.chen@linux.intel.com,
morten.rasmussen@arm.com
Subject: Re: [PATCH V2] sched: Improve load balancing in the presence of idle CPUs
Date: Fri, 27 Mar 2015 15:00:08 +0800 [thread overview]
Message-ID: <20150327070008.GA5496@kernel> (raw)
In-Reply-To: <20150327053907.GB6895@linux.vnet.ibm.com>
Hi Srikar,
On Fri, Mar 27, 2015 at 11:09:07AM +0530, Srikar Dronamraju wrote:
>
>Yes, the need_resched() in nohz_idle_balance() would exit the
>nohz_idle_balance if it has something to run. However I wonder if we
>should move the need_resched check out of the for loop. i.e the
>need_resched check should probably be there with the idle check.
>
>With the current code when the ilb cpus are not free:
>- We would be updating the nohz.next_balance even through we havent done
> any load balance.
>- We might iterate thro the nohz.idle_cpus_mask()s to find balance_cpus.
Good idea, the nohz load balance will be delay since nohz.next_balance is
updated inapposite when current ILB just be busy. I will send a patch to
fix it. ;)
Regards,
Wanpeng Li
next prev parent reply other threads:[~2015-03-27 7:18 UTC|newest]
Thread overview: 33+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-03-26 13:02 [PATCH V2] sched: Improve load balancing in the presence of idle CPUs 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 [this message]
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
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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