linux-kernel - Re: [PATCH v1 3/3] locking/lockdep,doc: Correct the max number of lock classes

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Date:   Mon, 12 Jul 2021 15:49:12 +0800
From:   Xiongwei Song <sxwjean@...il.com>
To:     Waiman Long <llong@...hat.com>
Cc:     Xiongwei Song <sxwjean@...com>, peterz@...radead.org,
        mingo@...hat.com, will@...nel.org,
        Boqun Feng <boqun.feng@...il.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Jonathan Corbet <corbet@....net>, linux-doc@...r.kernel.org
Subject: Re: [PATCH v1 3/3] locking/lockdep,doc: Correct the max number of
 lock classes

On Sun, Jul 11, 2021 at 11:22 PM Waiman Long <llong@...hat.com> wrote:
>
> On 7/11/21 10:14 AM, Xiongwei Song wrote:
> > From: Xiongwei Song <sxwjean@...il.com>
> >
> > The max number of lock classes is 8192.
> >
> > Signed-off-by: Xiongwei Song <sxwjean@...il.com>
> > Cc: Jonathan Corbet <corbet@....net>
> > Cc: linux-doc@...r.kernel.org
> > ---
> >   Documentation/locking/lockdep-design.rst | 4 ++--
> >   1 file changed, 2 insertions(+), 2 deletions(-)
> >
> > diff --git a/Documentation/locking/lockdep-design.rst b/Documentation/locking/lockdep-design.rst
> > index 82f36cab61bd..5c2dcec684ff 100644
> > --- a/Documentation/locking/lockdep-design.rst
> > +++ b/Documentation/locking/lockdep-design.rst
> > @@ -341,7 +341,7 @@ Exceeding this number will trigger the following lockdep warning::
> >
> >       (DEBUG_LOCKS_WARN_ON(id >= MAX_LOCKDEP_KEYS))
> >
> > -By default, MAX_LOCKDEP_KEYS is currently set to 8191, and typical
> > +By default, MAX_LOCKDEP_KEYS is currently set to 8192, and typical
> >   desktop systems have less than 1,000 lock classes, so this warning
> >   normally results from lock-class leakage or failure to properly
> >   initialize locks.  These two problems are illustrated below:
> > @@ -383,7 +383,7 @@ you the number of lock classes currently in use along with the maximum::
> >
> >   This command produces the following output on a modest system::
> >
> > -     lock-classes:                          748 [max: 8191]
> > +     lock-classes:                          748 [max: 8192]
> >
> >   If the number allocated (748 above) increases continually over time,
> >   then there is likely a leak.  The following command can be used to
>
> Acked-by: Waiman Long <longman@...hat.com>

Thanks.