linux-kernel - Re: [PATCH tip/core/rcu 0/5] Provide SRCU polling grace-period interfaces

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Message-ID: <20201121011254.GS1437@paulmck-ThinkPad-P72>
Date:   Fri, 20 Nov 2020 17:12:54 -0800
From:   "Paul E. McKenney" <paulmck@...nel.org>
To:     Steven Rostedt <rostedt@...dmis.org>
Cc:     rcu@...r.kernel.org, linux-kernel@...r.kernel.org,
        kernel-team@...com, mingo@...nel.org, jiangshanlai@...il.com,
        akpm@...ux-foundation.org, mathieu.desnoyers@...icios.com,
        josh@...htriplett.org, tglx@...utronix.de, peterz@...radead.org,
        dhowells@...hat.com, edumazet@...gle.com, fweisbec@...il.com,
        oleg@...hat.com, joel@...lfernandes.org
Subject: Re: [PATCH tip/core/rcu 0/5] Provide SRCU polling grace-period
 interfaces

On Fri, Nov 20, 2020 at 08:05:53PM -0500, Steven Rostedt wrote:
> On Fri, 20 Nov 2020 16:58:09 -0800
> "Paul E. McKenney" <paulmck@...nel.org> wrote:
> 
> > 	OK, maybe no one needs it, but rcutorture does need it, so here
> > 	it is anyway.
> 
> Ah, so there was a use case. I was scratching my head a bit before
> reading this ;-)

Indeed, the overhead of start_poll_synchronize_srcu() is a killer for
some parts of rcutorture, plus those parts don't care if no grace period
gets started...

							Thanx, Paul