linux-kernel - Re: [PATCH v3 0/5] sync a se with its cfs

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Message-ID: <20150820104609.GI24261@byungchulpark-X58A-UD3R>
Date:	Thu, 20 Aug 2015 19:46:09 +0900
From:	Byungchul Park <byungchul.park@....com>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	mingo@...nel.org, linux-kernel@...r.kernel.org, yuyang.du@...el.com
Subject: Re: [PATCH v3 0/5] sync a se with its cfs_rq when att(det)aching it

On Thu, Aug 20, 2015 at 05:38:41PM +0900, Byungchul Park wrote:
> On Thu, Aug 20, 2015 at 03:17:21AM +0200, Peter Zijlstra wrote:
> > 
> > I did something like this on top.. please have a look at the XXX and
> > integrate.
> 
> i am not sure, what do you intend for me to do.
> 
> do you mean that i am supposed to integrate this cleanup patch you gave me
> including the XXX comment?
> 
> > +	 *
> > +	 * XXX this appears wrong!! check history, 
> > +	 * we appear to always set queued and RUNNING under the same lock instance
> > +	 * might be from before TASK_WAKING ?
> >  	 */
> 
> is it impossible to happen to check if vruntime is normalized, when doing
> something like e.g. active load balance where queued != TASK_ON_RQ_QUEUED
> and p->state == TASK_RUNNING?

furthermore, in any migration by load balance, it seems to be possible..

> 
> i think it can happen..
> 
> thanks,
> byungchul
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