linux-kernel - Re: [PATCH tip/core/rcu 02/15] rcu: Use timer as backstop for NOCB deferred wakeups

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Message-ID: <20170726190934.1807e761@vmware.local.home>
Date:   Wed, 26 Jul 2017 19:09:34 -0400
From:   Steven Rostedt <rostedt@...dmis.org>
To:     "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
Cc:     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,
        dhowells@...hat.com, edumazet@...gle.com, fweisbec@...il.com,
        oleg@...hat.com
Subject: Re: [PATCH tip/core/rcu 02/15] rcu: Use timer as backstop for NOCB
 deferred wakeups

On Wed, 26 Jul 2017 14:47:41 -0700
"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com> wrote:


> > It is much lighter weight than a timer setup.  
> 
> How much lighter weight?  In other words, what fraction of the
> timers have to avoid being cancelled for irq_work to break even?

No idea. I guess that would be a nice academic exercise ;-)

-- Steve