linux-kernel - Re: [Patch v5 0/9] liblockdep: userspace lockdep

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Message-ID: <20131109160120.GD4971@laptop.programming.kicks-ass.net>
Date:	Sat, 9 Nov 2013 17:01:20 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	Sasha Levin <sasha.levin@...cle.com>
Cc:	Ingo Molnar <mingo@...nel.org>, torvalds@...ux-foundation.org,
	linux-kernel@...r.kernel.org
Subject: Re: [Patch v5 0/9] liblockdep: userspace lockdep

On Fri, Nov 08, 2013 at 12:04:18PM -0500, Sasha Levin wrote:

> >
> >* Sasha Levin <sasha.levin@...cle.com> wrote:
> >
> >>On 07/08/2013 04:39 AM, Ingo Molnar wrote:
> >>>
> >>>* Sasha Levin <sasha.levin@...cle.com> wrote:
> >>>
> >>>>>>The other issue is that with lock classes disabled you have to hit an
> >>>>>>actual deadlock to trigger any output.
> >>>>>>
> >>>>>>I.e. much of the power of lockdep is diminished :-/ When actual
> >>>>>>deadlocks are triggered then it's not particularly complex to debug
> >>>>>>user-space apps: gdb the hung task(s) and look at the backtraces.
> >>>>>
> >>>>>Lock classes are disabled only if you're using the LD_PRELOAD method
> >>>>>of testing. If you actually re-compile your code with the library (by
> >>>>>just including the header and setting a #define to enable it) you will
> >>>>>have lock classes.
> >>>>
> >>>>Hi Ingo,
> >>>>
> >>>>Just wondering if you're planning on pushing it over to Linus from your
> >>>>tree, or should I go ahead and do it on my own?
> >>>
> >>>PeterZ is in favor as well so I'll apply them after the merge window, for
> >>>v3.12.
> >>
> >>Hi Ingo,
> >>
> >>Do you intend to send liblockdep in this merge window as planned?
> >
> >If Peter agrees with them and picks them up then the next merge window
> >would be fine I guess.
> 
> Ping? Anyone?

Urgh, I missed Ingo throwing the ball back in my court.. sorry about
that. I'll have a look on Monday.
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