linux-kernel - Re: [PATCH v4] membarrier: expedited private command

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Message-Id: <20170731194424.GO3730@linux.vnet.ibm.com>
Date:   Mon, 31 Jul 2017 12:44:24 -0700
From:   "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
To:     Dave Watson <davejwatson@...com>
Cc:     Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
        Peter Zijlstra <peterz@...radead.org>,
        linux-kernel@...r.kernel.org, Boqun Feng <boqun.feng@...il.com>,
        Andrew Hunter <ahh@...gle.com>,
        Maged Michael <maged.michael@...il.com>, gromer@...gle.com,
        Avi Kivity <avi@...lladb.com>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        Michael Ellerman <mpe@...erman.id.au>
Subject: Re: [PATCH v4] membarrier: expedited private command

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@...com>

Applied, and thank you for testing this!

							Thanx, Paul