linux-kernel - Re: [RFC][PATCH] irq

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Message-ID: <1277377852.1875.950.camel@laptop>
Date:	Thu, 24 Jun 2010 13:10:52 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Andi Kleen <andi@...stfloor.org>
Cc:	Huang Ying <ying.huang@...el.com>, Ingo Molnar <mingo@...e.hu>,
	"H.PeterA" <"nvin hpa"@zytor.com>, linux-kernel@...r.kernel.org
Subject: Re: [RFC][PATCH] irq_work

On Thu, 2010-06-24 at 13:08 +0200, Andi Kleen wrote:
> > And I really want hardirq context for perf callbacks, some code actually
> > relies on it (I used to have the fallback in the timer softirq and that
> 
> Surely that could be fixed?  *requiring* hard irq context sounds weird.

possibly, but there is no reason what so ever to use softirq here.

> > broke thing at some point).
> 
> I have one case that needs to sleep (but only when interrupting user code)
> They key thing in it really is to switch stacks back to process.

softirq can't sleep either, you need a trampoline anyway.
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