linux-kernel - Re: [PATCH 5/5 v2] rcu: Fix dyntick-idle tracing

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Message-ID: <20170407112935.27f265f0@gandalf.local.home>
Date:   Fri, 7 Apr 2017 11:29:35 -0400
From:   Steven Rostedt <rostedt@...dmis.org>
To:     "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
Cc:     linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...nel.org>,
        Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH 5/5 v2] rcu: Fix dyntick-idle tracing

On Fri, 7 Apr 2017 08:09:22 -0700
"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com> wrote:
   
> > > 
> > > Yeah, I am a bit concerned about idle-entry latency...
> > >   
> > 
> > Which should now be fine because of the inlined this_cpu_inc/dec()
> > which is very efficient and made for fast paths like this.  
> 
> OK, I am willing to let people complain if they can measure the
> difference.  If they can measure the difference, there are some things
> we can do.

Again, I was getting this_cpu_inc/dec confused with __this_cpu_inc/dec.
I'll update my patch to fix that.

-- Steve