linux-kernel - Re: 'global' rq->clock

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Message-Id: <20080503.164024.265682957.davem@davemloft.net>
Date:	Sat, 03 May 2008 16:40:24 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	mingo@...e.hu
Cc:	benh@...nel.crashing.org, a.p.zijlstra@...llo.nl, efault@....de,
	elendil@...net.nl, parag.warudkar@...il.com,
	linux-kernel@...r.kernel.org, guichaz@...oo.fr, andi@...stfloor.org
Subject: Re: 'global' rq->clock

From: Ingo Molnar <mingo@...e.hu>
Date: Sun, 4 May 2008 01:38:25 +0200

> ah, good! It really looks like unnecessary overhead for the "simple 
> IPIs". But ... i'm wondering ... what about softirq processing? Do these 
> IPIs process softirqs on the way out? In that case the non-processed 
> jiffies might be a problem.
> 
> it's all a bit messy. I wish we could start turning jiffies into a 
> function (which would just read GTOD and estimate jiffies from there), 
> but i fear we are not there yet ...

I think Peter Z. made a good point that we probably need to
keep it there for smp_call_function() receivers, so that
the called functions can test the context they are in accurately.
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