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

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Date:	Fri, 08 Nov 2013 12:04:18 -0500
From:	Sasha Levin <sasha.levin@...cle.com>
To:	Ingo Molnar <mingo@...nel.org>
CC:	Peter Zijlstra <peterz@...radead.org>,
	torvalds@...ux-foundation.org, linux-kernel@...r.kernel.org
Subject: Re: [Patch v5 0/9] liblockdep: userspace lockdep

On 09/12/2013 02:01 PM, Ingo Molnar 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?


Thanks,
Sasha

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