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

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Message-ID: <20100624132032.GA4474@kryptos.osrc.amd.com>
Date:	Thu, 24 Jun 2010 15:20:32 +0200
From:	Borislav Petkov <bp@...64.org>
To:	Andi Kleen <andi@...stfloor.org>
Cc:	Ingo Molnar <mingo@...e.hu>, Peter Zijlstra <peterz@...radead.org>,
	Huang Ying <ying.huang@...el.com>,
	"H. Peter Anvin" <hpa@...or.com>,
	Borislav Petkov <petkovbb@...glemail.com>,
	linux-kernel@...r.kernel.org, mauro@...e.hu
Subject: Re: [RFC][PATCH] irq_work

From: Andi Kleen <andi@...stfloor.org>
Date: Thu, Jun 24, 2010 at 03:02:34PM +0200

> On Thu, Jun 24, 2010 at 02:35:37PM +0200, Ingo Molnar wrote:
> > All of these solutions use the fact that perf events are a generic event 
> > framework. If there's any missing details somewhere then fixes/enhancements 
> > can be added - right now our in-kernel event consumers are simple. But the 
> > design is sound.
> 
> One immediate problem that comes to mind with the proposal 
> is that if the event is of a type that cannot be dropped (e.g. an error 
> that needs to be handled) then a shared ring buffer cannot guarantee that.

If its a critical error you do all the handling in the kernel and you
don't need task context at all, no? Can you give an example of such an
error?

-- 
Regards/Gruss,
Boris.

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