linux-kernel - Re: runnable tasks never making it to a runqueue where they can run?

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Message-ID: <20120308115506.GA22656@linux.vnet.ibm.com>
Date:	Thu, 8 Mar 2012 17:25:06 +0530
From:	Srivatsa Vaddagiri <vatsa@...ux.vnet.ibm.com>
To:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Cc:	Roland Dreier <roland@...nel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Paul Turner <pjt@...gle.com>,
	Venkatesh Pallipadi <venki@...gle.com>,
	Suresh Siddha <suresh.b.siddha@...el.com>
Subject: Re: runnable tasks never making it to a runqueue where they can run?

* Peter Zijlstra <a.p.zijlstra@...llo.nl> [2012-03-08 11:28:00]:

> select_task_rq_fair() will very likely end up in select_idle_sibling()
> which will never select the smt1 if smt0 is idle

s/idle/busy?

> (even if smt0 isn't in
> the cpus allowed mask) -- Vatsa is currently reworking that area, this
> is something he might want to consider.

The patch I sent couple of days back should likely fix this issue:

http://marc.info/?l=linux-kernel&m=133096114129607&w=2

- vatsa

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