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

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Date:	Thu, 27 Jun 2013 11:05:52 +0200
From:	Ingo Molnar <mingo@...nel.org>
To:	Sasha Levin <sasha.levin@...cle.com>
Cc:	Peter Zijlstra <peterz@...radead.org>,
	torvalds@...ux-foundation.org, linux-kernel@...r.kernel.org
Subject: Re: [Patch v5 0/9] liblockdep: userspace lockdep


* Sasha Levin <sasha.levin@...cle.com> wrote:

> On 06/26/2013 11:53 AM, Ingo Molnar wrote:
> >>Ingo, I don't think I see anything holding this back; however I remember
> >>>reading some email about people not liking stuff like this living in the
> >>>tools/ directory or such.
> >>>
> >>>Will you pick this up?
> >So I'd really be interested in how interesting/useful this is to userspace
> >developers? Does it work for something complex as Firefox, or Apache, to
> >the extent they make use of these locking APIs?
> 
> So far I've tested it on Firefox, Apache, QEMU, LKVM, GCC and random 
> smallish programs. I haven't really done full testing for each of those, 
> but just made sure that liblockdep behaves as it supposed to. I'm 
> guessing that with further work it will dig up actual issues.

Would it be possible to collect and print some stats about lock API 
usages, a'ka /proc/lockdep_stats et al?

Also, Xorg might be something that uses rather involved locking. It might 
not use many pthread mutexes though.

Thanks,

	Ingo
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