linux-kernel - Re: [RT] lockdep munching nr_list

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Date:   Thu, 16 Feb 2017 19:06:20 +0100
From:   Mike Galbraith <efault@....de>
To:     Sebastian Andrzej Siewior <bigeasy@...utronix.de>
Cc:     Peter Zijlstra <peterz@...radead.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        RT <linux-rt-users@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [RT] lockdep munching nr_list_entries like popcorn

On Thu, 2017-02-16 at 15:53 +0100, Sebastian Andrzej Siewior wrote:
> On 2017-02-16 15:42:59 [+0100], Mike Galbraith wrote:
> > 
> > Weeell, I'm trying to cobble something kinda like that together using
> > __RT_SPIN_INITIALIZER() instead, but seems mean ole Mr. Compiler NAKs
> > the PER_CPU_DEP_MAP_INIT() thingy.
> > 
> >   CC      mm/swap.o
> > mm/swap.c:54:689: error: braced-group within expression allowed only
> > inside a function
> 
> so this is what I have now. I need to get the `static' symbol working
> again and PER_CPU_DEP_MAP_INIT but aside from that it seems to do its
> job.

...

Yeah, works, I should be able to do an ltp run with stock lockdep
settings without it taking it's toys and going home in a snit. 

berio:/sys/kernel/debug/tracing/:[0]# !while
while sleep 60; do tail -1 trace; done
           <...>-10315 [064] d...1..   226.953935: add_lock_to_list.isra.24.constprop.42: nr_list_entries: 14223
               w-13148 [120] d...111   287.414978: add_lock_to_list.isra.24.constprop.42: nr_list_entries: 14465
               w-16492 [089] d...111   347.128742: add_lock_to_list.isra.24.constprop.42: nr_list_entries: 14653
(starts kbuild loop)
 btrfs-transacti-1964  [016] d...1..   411.101549: add_lock_to_list.isra.24.constprop.42: nr_list_entries: 17011
           <...>-100268 [127] d...112   472.271769: add_lock_to_list.isra.24.constprop.42: nr_list_entries: 18153
               w-18864 [011] d...1..   534.386443: add_lock_to_list.isra.24.constprop.42: nr_list_entries: 18543
           <...>-50390 [035] dN..2..   597.794164: add_lock_to_list.isra.24.constprop.42: nr_list_entries: 18765
           <...>-80098 [127] d...111   659.912145: add_lock_to_list.isra.24.constprop.42: nr_list_entries: 18977
       checkproc-11123 [017] d...1..   721.483463: add_lock_to_list.isra.24.constprop.42: nr_list_entries: 19247
          <idle>-0     [055] d..h5..   782.685953: add_lock_to_list.isra.24.constprop.42: nr_list_entries: 19383
           <...>-93632 [055] d...111   835.527817: add_lock_to_list.isra.24.constprop.42: nr_list_entries: 19441