linux-kernel - Re: [PATCH rcu 3/7] locking: Reduce the number of locks in ww

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Date:   Fri, 17 Mar 2023 14:26:22 -0700
From:   Boqun Feng <boqun.feng@...il.com>
To:     "Paul E. McKenney" <paulmck@...nel.org>
Cc:     rcu@...r.kernel.org, Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>, Will Deacon <will@...nel.org>,
        Waiman Long <longman@...hat.com>,
        Lai Jiangshan <jiangshanlai@...il.com>,
        Josh Triplett <josh@...htriplett.org>,
        Steven Rostedt <rostedt@...dmis.org>,
        Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
        Davidlohr Bueso <dave@...olabs.net>,
        Frederic Weisbecker <frederic@...nel.org>,
        Neeraj Upadhyay <quic_neeraju@...cinc.com>,
        Joel Fernandes <joel@...lfernandes.org>,
        Shuah Khan <shuah@...nel.org>,
        David Woodhouse <dwmw2@...radead.org>,
        Paolo Bonzini <pbonzini@...hat.com>, kvm@...r.kernel.org,
        seanjc@...gle.com, linux-kernel@...r.kernel.org,
        linux-kselftest@...r.kernel.org,
        kernel test robot <oliver.sang@...el.com>
Subject: Re: [PATCH rcu 3/7] locking: Reduce the number of locks in ww_mutex
 stress tests

On Fri, Mar 17, 2023 at 11:38:19AM -0700, Paul E. McKenney wrote:
> On Thu, Mar 16, 2023 at 08:13:35PM -0700, Boqun Feng wrote:
> > The stress test in test_ww_mutex_init() uses 4095 locks since
> > lockdep::reference has 12 bits, and since we are going to reduce it to
> > 11 bits to support lock_sync(), and 2047 is still a reasonable number of
> > the max nesting level for locks, so adjust the test.
> > 
> > Reported-by: kernel test robot <oliver.sang@...el.com>
> > Link: https://lore.kernel.org/oe-lkp/202302011445.9d99dae2-oliver.sang@intel.com
> > Signed-off-by: Boqun Feng <boqun.feng@...il.com>
> 
> Tested-by: Paul E. McKenney <paulmck@...nel.org>
> 

Applied, thanks!

Regards,
Boqun

> > ---
> >  kernel/locking/test-ww_mutex.c | 2 +-
> >  1 file changed, 1 insertion(+), 1 deletion(-)
> > 
> > diff --git a/kernel/locking/test-ww_mutex.c b/kernel/locking/test-ww_mutex.c
> > index 29dc253d03af..93cca6e69860 100644
> > --- a/kernel/locking/test-ww_mutex.c
> > +++ b/kernel/locking/test-ww_mutex.c
> > @@ -659,7 +659,7 @@ static int __init test_ww_mutex_init(void)
> >  	if (ret)
> >  		return ret;
> >  
> > -	ret = stress(4095, hweight32(STRESS_ALL)*ncpus, STRESS_ALL);
> > +	ret = stress(2047, hweight32(STRESS_ALL)*ncpus, STRESS_ALL);
> >  	if (ret)
> >  		return ret;
> >  
> > -- 
> > 2.39.2
> >