linux-kernel - Re: [PATCH 1/2] membarrier: add MEMBARRIER_CMD_PRIVATE_RESTART_RSEQ_ON

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Date:   Fri, 7 Aug 2020 21:02:04 +0200
From:   peterz@...radead.org
To:     Mathieu Desnoyers <mathieu.desnoyers@...icios.com>
Cc:     Peter Oskolkov <posk@...k.io>, Peter Oskolkov <posk@...gle.com>,
        paulmck <paulmck@...nel.org>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        Paul Turner <pjt@...gle.com>,
        Chris Kennelly <ckennelly@...gle.com>
Subject: Re: [PATCH 1/2] membarrier: add
 MEMBARRIER_CMD_PRIVATE_RESTART_RSEQ_ON_CPU

On Fri, Aug 07, 2020 at 02:07:59PM -0400, Mathieu Desnoyers wrote:
> One thing I find weird about Peter's patch is that it adds a
> MEMBERRIER_CMD_PRIVATE_EXPEDITED_RSEQ without a corresponding
> MEMBARRIER_CMD_REGISTER_PRIVATE_EXPEDITED_RSEQ. Considering that
> the SYNC_CORE variant already has its own register command, I
> find it weird that the RSEQ counterpart does not have one.

I thought the register thing was about global, not private membarriers.

Anyway, it was just a quick pseudo thing to show how one can go about
adding the rseq to the mm iteration we already have.