linux-kernel - Re: [PATCH tip/core/rcu 04/12] rcutorture: Force on tick for readers and callback flooders

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Message-ID: <20191005165256.GJ2689@paulmck-ThinkPad-P72>
Date:   Sat, 5 Oct 2019 09:52:56 -0700
From:   "Paul E. McKenney" <paulmck@...nel.org>
To:     Frederic Weisbecker <frederic@...nel.org>
Cc:     rcu@...r.kernel.org, linux-kernel@...r.kernel.org,
        mingo@...nel.org, jiangshanlai@...il.com, dipankar@...ibm.com,
        akpm@...ux-foundation.org, mathieu.desnoyers@...icios.com,
        josh@...htriplett.org, tglx@...utronix.de, peterz@...radead.org,
        rostedt@...dmis.org, dhowells@...hat.com, edumazet@...gle.com,
        fweisbec@...il.com, oleg@...hat.com, joel@...lfernandes.org
Subject: Re: [PATCH tip/core/rcu 04/12] rcutorture: Force on tick for readers
 and callback flooders

On Thu, Oct 03, 2019 at 04:14:58PM +0200, Frederic Weisbecker wrote:
> On Wed, Oct 02, 2019 at 06:38:55PM -0700, paulmck@...nel.org wrote:
> > From: "Paul E. McKenney" <paulmck@...ux.ibm.com>
> > 
> > Readers and callback flooders in the rcutorture stress-test suite run for
> > extended time periods by design.  They do take pains to relinquish the
> > CPU from time to time, but in some cases this relies on the scheduler
> > being active, which in turn relies on the scheduler-clock interrupt
> > firing from time to time.
> > 
> > This commit therefore forces scheduling-clock interrupts within
> > these loops.  While in the area, this commit also prevents
> > rcu_torture_reader()'s occasional timed sleeps from delaying shutdown.
> > 
> > [ paulmck: Apply Joel Fernandes TICK_DEP_MASK_RCU->TICK_DEP_BIT_RCU fix. ]
> > Signed-off-by: Paul E. McKenney <paulmck@...ux.ibm.com>
> 
> You can also remove all the IS_ENABLED here.

Again, good catch and fixed, thank you!

							Thanx, Paul