linux-kernel - Re: [RFC] [PATCH 0/2] Futex fault injection

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Message-ID: <1259664883.1697.28.camel@laptop>
Date:	Tue, 01 Dec 2009 11:54:43 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	Sripathi Kodi <sripathik@...ibm.com>,
	Fr??d??ric Weisbecker <fweisbec@...il.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	linux-kernel@...r.kernel.org, Darren Hart <dvhltc@...ibm.com>
Subject: Re: [RFC] [PATCH 0/2] Futex fault injection

On Tue, 2009-12-01 at 11:33 +0100, Ingo Molnar wrote:
> * Sripathi Kodi <sripathik@...ibm.com> wrote:
> 
> > Hi,
> > 
> > This patch set adds fault injection for futex subsystem. It adds 
> > faults at places where reading/writing from user space can return 
> > EFAULT. This will be useful in testing any significant change to futex 
> > subsystem.
> 
> Instead of this unacceptably ugly and special-purpose debugfs interface, 
> please extend perf events to allow event injection. Some other places in 
> the kernel (which deal with rare events) want/need this capability too.

Thing is, he's using the 'normal' fault injection code to do this, I see
no objection to doing that.

If you want to redo the fault injection subsystem, then that's another
story, but then we need to convert all of its users over.

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