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

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Date:   Thu, 3 Oct 2019 16:14:58 +0200
From:   Frederic Weisbecker <frederic@...nel.org>
To:     paulmck@...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,
        "Paul E. McKenney" <paulmck@...ux.ibm.com>
Subject: Re: [PATCH tip/core/rcu 04/12] rcutorture: Force on tick for readers
 and callback flooders

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.

Thanks!