From: Peter Zijlstra <a.p.zijlstra@chello.nl>
To: Srivatsa Vaddagiri <vatsa@linux.vnet.ibm.com>
Cc: Roland Dreier <roland@kernel.org>,
LKML <linux-kernel@vger.kernel.org>, Paul Turner <pjt@google.com>,
Venkatesh Pallipadi <venki@google.com>,
Suresh Siddha <suresh.b.siddha@intel.com>
Subject: Re: runnable tasks never making it to a runqueue where they can run?
Date: Thu, 08 Mar 2012 13:00:28 +0100 [thread overview]
Message-ID: <1331208028.11248.384.camel@twins> (raw)
In-Reply-To: <20120308115506.GA22656@linux.vnet.ibm.com>
On Thu, 2012-03-08 at 17:25 +0530, Srivatsa Vaddagiri wrote:
> * Peter Zijlstra <a.p.zijlstra@chello.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?
Uhm, yeah ;-)
> > (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
Ah, thanks for reminding me, I need to go stare at that!
prev parent reply other threads:[~2012-03-08 12:00 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-03-07 2:19 runnable tasks never making it to a runqueue where they can run? Roland Dreier
2012-03-07 16:30 ` Peter Zijlstra
2012-03-07 16:31 ` Peter Zijlstra
2012-03-07 18:03 ` Roland Dreier
2012-03-08 10:28 ` Peter Zijlstra
2012-03-08 11:55 ` Srivatsa Vaddagiri
2012-03-08 12:00 ` Peter Zijlstra [this message]
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