linux-kernel - Re: [PATCH v2 1/2] workqueue: add quiescent state between work items

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Message-ID: <20141006042158.GW5015@linux.vnet.ibm.com>
Date:	Sun, 5 Oct 2014 21:21:58 -0700
From:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
To:	Tejun Heo <tj@...nel.org>
Cc:	Joe Lawrence <joe.lawrence@...atus.com>,
	linux-kernel@...r.kernel.org, jiri@...nulli.us,
	stable@...r.kernel.org
Subject: Re: [PATCH v2 1/2] workqueue: add quiescent state between work items

On Sun, Oct 05, 2014 at 03:47:48PM -0400, Tejun Heo wrote:
> On Sun, Oct 05, 2014 at 03:21:19PM -0400, Tejun Heo wrote:
> > On Sun, Oct 05, 2014 at 01:24:21PM -0400, Joe Lawrence wrote:
> > > Similar to the stop_machine deadlock scenario on !PREEMPT kernels
> > > addressed in b22ce2785d97 "workqueue: cond_resched() after processing
> > > each work item", kworker threads requeueing back-to-back with zero jiffy
> > > delay can stall RCU. The cond_resched call introduced in that fix will
> > > yield only iff there are other higher priority tasks to run, so force a
> > > quiescent RCU state between work items.
> > > 
> > > Signed-off-by: Joe Lawrence <joe.lawrence@...atus.com>
> > > Link: https://lkml.kernel.org/r/20140926105227.01325697@jlaw-desktop.mno.stratus.com
> > > Link: https://lkml.kernel.org/r/20140929115445.40221d8e@jlaw-desktop.mno.stratus.com
> > > Fixes: b22ce2785d97 ("workqueue: cond_resched() after processing each work item")
> > > Cc: <stable@...r.kernel.org>
> > 
> > Applied to wq/for-3.17-fixes.  If 3.17 comes out before this gets
> > merged, I'll send it as for-3.18.
> 
> Oops, the rcu calls aren't in mainline yet.  I think it'd be best to
> route these through the RCU tree.  Paul, can you please route these
> two patches?
> 
> Acked-by: Tejun Heo <tj@...nel.org>

Will do!

I will try 3.17, failing that, 3.18.

							Thanx, Paul

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