linux-kernel - Re: [PATCH [RT] 08/14] add a loop counter based timeout mechanism

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Message-ID: <9810cff90802221121s216f69f4k4a5f39eaaf11dd7f@mail.gmail.com>
Date:	Fri, 22 Feb 2008 11:21:14 -0800
From:	"Bill Huey (hui)" <bill.huey@...il.com>
To:	paulmck@...ux.vnet.ibm.com
Cc:	"Andi Kleen" <ak@...e.de>, "Gregory Haskins" <ghaskins@...ell.com>,
	mingo@...e.hu, a.p.zijlstra@...llo.nl, tglx@...utronix.de,
	rostedt@...dmis.org, linux-rt-users@...r.kernel.org,
	linux-kernel@...r.kernel.org, kevin@...man.org,
	cminyard@...sta.com, dsingleton@...sta.com, dwalker@...sta.com,
	npiggin@...e.de, dsaxena@...xity.net, gregkh@...e.de,
	sdietrich@...ell.com, pmorreale@...ell.com, mkohari@...ell.com
Subject: Re: [PATCH [RT] 08/14] add a loop counter based timeout mechanism

On Fri, Feb 22, 2008 at 11:19 AM, Bill Huey (hui) <bill.huey@...il.com> wrote:
>  Yeah, I'm not very keen on having a constant there without some
>  contention instrumentation to see how long the spins are. It would be
>  better to just let it run until either task->on_cpu is off or checking
>  if the "current" in no longer matches the mutex owner for the runqueue
>  in question. At that point, you know the thread isn't running.
>  Spinning on something like that is just a waste of time. It's for that
>  reason that doing in the spin outside of a preempt critical section
>  isn't really needed

Excuse me, I meant to say "...isn't a problem".

bill
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