linux-kernel - Re: [PATCH RFC tip/core/rcu 14/14] rcu/nohz: Make multi_cpu

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Message-ID: <20190805174800.GK28441@linux.ibm.com>
Date:   Mon, 5 Aug 2019 10:48:00 -0700
From:   "Paul E. McKenney" <paulmck@...ux.ibm.com>
To:     Peter Zijlstra <peterz@...radead.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, rostedt@...dmis.org,
        dhowells@...hat.com, edumazet@...gle.com, fweisbec@...il.com,
        oleg@...hat.com, joel@...lfernandes.org
Subject: Re: [PATCH RFC tip/core/rcu 14/14] rcu/nohz: Make multi_cpu_stop()
 enable tick on all online CPUs

On Mon, Aug 05, 2019 at 05:50:24PM +0200, Peter Zijlstra wrote:
> On Mon, Aug 05, 2019 at 07:54:48AM -0700, Paul E. McKenney wrote:
> 
> > > Right; so clearly we're not understanding what's happening. That seems
> > > like a requirement for actually doing a patch.
> > 
> > Almost but not quite.  It is a requirement for a patch *that* *is*
> > *supposed* *to* *be* *a* *fix*.  If you are trying to prohibit me from
> > writing experimental patches, please feel free to take a long walk on
> > a short pier.
> > 
> > Understood???
> 
> Ah, my bad, I thought you were actually proposing this as an actual
> patch. I now see that is my bad, I'd overlooked the RFC part.

No problem!

And of course adding tracing decreases the frequency and duration of
the multi_cpu_stop().  Re-running with shorter-duration triggering.  ;-)

							Thanx, Paul