linux-kernel - Re: [PATCH v1] sched: fix nohz idle load balancer issues

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Message-ID: <20110928142735.GG8593@linux.vnet.ibm.com>
Date:	Wed, 28 Sep 2011 19:57:36 +0530
From:	Srivatsa Vaddagiri <vatsa@...ux.vnet.ibm.com>
To:	Venki Pallipadi <venki@...gle.com>
Cc:	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Paul Turner <pjt@...gle.com>, Ingo Molnar <mingo@...e.hu>,
	Vaidyanathan Srinivasan <svaidy@...ux.vnet.ibm.com>,
	Kamalesh Babulal <kamalesh@...ux.vnet.ibm.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v1] sched: fix nohz idle load balancer issues

* Srivatsa Vaddagiri <vatsa@...ux.vnet.ibm.com> [2011-09-28 19:47:01]:

> * Srivatsa Vaddagiri <vatsa@...ux.vnet.ibm.com> [2011-09-28 10:04:27]:
> 
> > > Especially with higher number of logical CPUs. Likely cleaner way is to clear
> > > first_pick, second_pick on idle instead of clearing on tickless.
> > 
> > I think I tried that (cleared first/second_pick_cpu in
> > nohz_kick_needed() upon idle) but didn't get the best results.

which perhaps was beause I was relying on idle_at_tick (which can be
stale information as Suresh pointed out).

- vatsa
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