linux-kernel - Re: [PATCH -tip 0/2] futex: Fault/error injection capabilities

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Message-ID: <1436780510.27924.71.camel@stgolabs.net>
Date:	Mon, 13 Jul 2015 02:41:50 -0700
From:	Davidlohr Bueso <dave@...olabs.net>
To:	Ingo Molnar <mingo@...nel.org>
Cc:	Peter Zijlstra <peterz@...radead.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Darren Hart <darren@...art.com>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH -tip 0/2] futex: Fault/error injection capabilities

Ingo, any thoughts about this?

Thanks.

On Mon, 2015-06-29 at 23:26 -0700, Davidlohr Bueso wrote:
> Hello,
> 
> I've been wanting this for a while to improve overall futex
> testing. I must say that I checked rather late when I was
> nearly finished with patch 2 if something similar for futexes
> had already been proposed. Sure enough, in 2009 this was discussed[1].
> 
> Coincidently, I also took the natural approach of making use of
> our fault-injection machinery. I have no idea if perf nowadays does
> such things, and if it does not, I honestly don't have the bandwidth
> to do it Ingo's preferred way -- when there is nothing wrong with
> this approach, imho (0 overhead). Anyway, here's a working patch.
> 
> Patch 1 is merely a trivial add-on.
> 
> [1]: https://lwn.net/Articles/364742/
> 
> Thanks!
> 
> Davidlohr Bueso (2):
>   futex: Enhance comments in futex_lock_pi() for blocking paths
>   futex: Fault/error injection capabilities
> 
>  Documentation/fault-injection/fault-injection.txt |  11 +++
>  kernel/futex.c                                    | 100 +++++++++++++++++++++-
>  lib/Kconfig.debug                                 |   7 ++
>  3 files changed, 114 insertions(+), 4 deletions(-)
> 


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