linux-kernel - Re: [PATCH tip/core/rcu 4/5] sys_membarrier: Add expedited option

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Message-ID: <20170727143624.oghezky7owivouy7@hirez.programming.kicks-ass.net>
Date:   Thu, 27 Jul 2017 16:36:24 +0200
From:   Peter Zijlstra <peterz@...radead.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, rostedt@...dmis.org,
        dhowells@...hat.com, edumazet@...gle.com, fweisbec@...il.com,
        oleg@...hat.com, will.deacon@....com
Subject: Re: [PATCH tip/core/rcu 4/5] sys_membarrier: Add expedited option

On Thu, Jul 27, 2017 at 07:32:05AM -0700, Paul E. McKenney wrote:
> > as per your proposed patch, will spray IPIs to all CPUs and at high
> > rates.
> 
> OK, I have updated my patch to do throttling.

But not respect cpusets. Which is the other important point.

The scheduler based IPIs are limited to where we are allowed to place
tasks (as are the TLB ones for that matter, for the exact same reason).