From: Srivatsa Vaddagiri <vatsa@linux.vnet.ibm.com>
To: Venki Pallipadi <venki@google.com>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>,
Paul Turner <pjt@google.com>, Ingo Molnar <mingo@elte.hu>,
Vaidyanathan Srinivasan <svaidy@linux.vnet.ibm.com>,
Kamalesh Babulal <kamalesh@linux.vnet.ibm.com>,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH v1] sched: fix nohz idle load balancer issues
Date: Wed, 28 Sep 2011 10:36:58 +0530 [thread overview]
Message-ID: <20110928050344.GD8593@linux.vnet.ibm.com> (raw)
In-Reply-To: <20110928043921.GC8593@linux.vnet.ibm.com>
* Srivatsa Vaddagiri <vatsa@linux.vnet.ibm.com> [2011-09-28 10:09:21]:
> * Srivatsa Vaddagiri <vatsa@linux.vnet.ibm.com> [2011-09-28 10:04:27]:
>
> > unless we want to go for more sophisticated like a sorted list of
> > rq->next_balance in a rb-tree
>
> Given that this list will need to be global (and not per-cpu) and it will need
> to be updated reqularly (even when cpus are busy and as they update their
> rq->next_balance), that will probably not fly!
On third thoughts, this list needs to be updated only in idle cpu
context (idle cpus going tickless will be inserted in the list (indexed at
rq->next_balance and cpu exiting idle will need to be removed). So the global
list may not hurt so much ..will see how that comes up in code.
- vatsa
next prev parent reply other threads:[~2011-09-28 5:07 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-09-26 11:50 [PATCH v1] sched: fix nohz idle load balancer issues Srivatsa Vaddagiri
2011-09-26 12:01 ` Srivatsa Vaddagiri
2011-09-27 6:32 ` Ingo Molnar
2011-09-27 10:31 ` Srivatsa Vaddagiri
2011-09-27 13:39 ` Ingo Molnar
2011-09-27 19:53 ` Venki Pallipadi
2011-09-27 23:49 ` Suresh Siddha
2011-09-28 4:15 ` Srivatsa Vaddagiri
2011-09-29 0:47 ` Suresh Siddha
2011-09-29 2:13 ` Srivatsa Vaddagiri
2011-09-29 8:15 ` Peter Zijlstra
2011-09-29 17:13 ` Suresh Siddha
2011-09-28 4:34 ` Srivatsa Vaddagiri
2011-09-28 4:39 ` Srivatsa Vaddagiri
2011-09-28 5:06 ` Srivatsa Vaddagiri [this message]
2011-09-28 14:17 ` Srivatsa Vaddagiri
2011-09-28 14:27 ` Srivatsa Vaddagiri
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