linux-kernel - Re: lockdep: BUG: MAX_LOCKDEP

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Message-ID: <52B3134D.2010203@oracle.com>
Date:	Thu, 19 Dec 2013 10:39:57 -0500
From:	Sasha Levin <sasha.levin@...cle.com>
To:	Peter Zijlstra <peterz@...radead.org>
CC:	Ingo Molnar <mingo@...nel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Dave Jones <davej@...hat.com>
Subject: Re: lockdep: BUG: MAX_LOCKDEP_ENTRIES too low!

On 12/19/2013 10:20 AM, Peter Zijlstra wrote:
> On Thu, Dec 19, 2013 at 09:02:14AM -0500, Sasha Levin wrote:
>> On 12/19/2013 05:34 AM, Peter Zijlstra wrote:
>>> On Thu, Dec 19, 2013 at 12:53:56AM -0500, Sasha Levin wrote:
>>>> Hi all,
>>>>
>>>> I think that my bloated kernel managed to create way too many entries in the
>>>> dependency table. If that sounds right, I can send a patch to increase those.
>>>>
>>>> Attached /proc/lock_stat as requested as well.
>>>
>>> /proc/lockdep_stats not lock_stat :-)
>>>
>>> Do you still happen to have that?
>>
>> Is the BUG message intentional ("Please attach the output of /proc/lock_stat to the bug report")?
>
> It does? This happened when I wasn't looking..
>
> Commit 199e371f59d31 did that; and the Changelog fails to mention why or
> what. Ingo, Dave?
>
> So the thing I referred to was from Documentation/lockdep-design.txt:

[snip]

That discusses lockdep classes, which is actually fine in my case. I ran out of
MAX_LOCKDEP_ENTRIES, which isn't mentioned anywhere in Documentation/ .


Thanks,
Sasha
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