Re: [PATCH 0/2] Ajust lockdep static allocations

[Babu Moger]

On 9/23/2016 2:12 AM, Peter Zijlstra wrote:
> On Thu, Sep 22, 2016 at 11:43:34AM -0700, Babu Moger wrote:
> > These patches adjust the static allocations for lockdep
> > data structures used for debugging locking correctness. The current
> > code reserves about 4MB extra space for these data structures. Most
> > of the configurations do not need these many data structures. While
> > testing, I have not seen it go beyond 20% of already reserved entries.
> >
> > $grep "lock-classes" /proc/lockdep_stats
> > 	lock-classes:                          1560 [max: 8191]
> >
> > Reserving even more space seems unreasonable. So, keeping the default
> > entries small as before the Commit 1413c0389333 ("lockdep: Increase static
> > allocations"). Added new CONFIG_PROVE_LOCKING_PLUS in case someone
> > needs more entries to debug their large configuration.
> Why make this more complicated? There's absolutely no upside to this
> change as far as I can see.
Peter, What do you mean?  Revert the commit 1413c038933?  Right now,
I cannot boot my setup after enabling lockdep. How do you think we can 
handle this?