Date: Mon, 31 Jul 2017 12:44:24 -0700
From: "Paul E. McKenney" <paulmck@linux.vnet.ibm.com>
To: Dave Watson <davejwatson@fb.com>
Cc: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>,
        Peter Zijlstra <peterz@infradead.org>, linux-kernel@vger.kernel.org,
        Boqun Feng <boqun.feng@gmail.com>, Andrew Hunter <ahh@google.com>,
        Maged Michael <maged.michael@gmail.com>, gromer@google.com,
        Avi Kivity <avi@scylladb.com>,
        Benjamin Herrenschmidt <benh@kernel.crashing.org>,
        Paul Mackerras <paulus@samba.org>,
        Michael Ellerman <mpe@ellerman.id.au>
Subject: Re: [PATCH v4] membarrier: expedited private command
Reply-To: paulmck@linux.vnet.ibm.com
References: <20170728204040.568-1-mathieu.desnoyers@efficios.com>
 <20170731192344.GA79955@dhcp-172-20-173-153.dhcp.thefacebook.com>
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On Mon, Jul 31, 2017 at 12:23:44PM -0700, Dave Watson wrote:
> On 07/28/17 04:40 PM, Mathieu Desnoyers wrote:
> > Implement MEMBARRIER_CMD_PRIVATE_EXPEDITED with IPIs using cpumask built
> > from all runqueues for which current thread's mm is the same as the
> > thread calling sys_membarrier. It executes faster than the non-expedited
> > variant (no blocking). It also works on NOHZ_FULL configurations.
> 
> I tested this with our hazard pointer use case on x86_64, and it seems
> to work great.  We don't currently have any uses needing SHARED.
> 
> Tested-by: Dave Watson <davejwatson@fb.com>

Applied, and thank you for testing this!

							Thanx, Paul