linux-kernel - Re: [Ksummit-discuss] [CORE TOPIC] lightweight per-cpu locks / restartable sequences

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Message-ID: <alpine.DEB.2.11.1507101224440.21165@east.gentwo.org>
Date:	Fri, 10 Jul 2015 12:26:21 -0500 (CDT)
From:	Christoph Lameter <cl@...ux.com>
To:	Chris Mason <clm@...com>
cc:	Andy Lutomirski <luto@...capital.net>,
	"ksummit-discuss@...ts.linuxfoundation.org" 
	<ksummit-discuss@...ts.linuxfoundation.org>,
	Peter Zijlstra <peterz@...radead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Jens Axboe <axboe@...com>,
	Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
	Shaohua Li <shli@...com>
Subject: Re: [Ksummit-discuss] [CORE TOPIC] lightweight per-cpu locks /
 restartable sequences

On Thu, 9 Jul 2015, Chris Mason wrote:

> I think the topic is really interesting and we'll be able to get numbers
> from production workloads to help justify and compare different
> approaches.

Ok that would be important. I also think that the approach may be used
in kernel to reduce the overhead of CONFIG_PREEMPT and also to implement
fast versions of this_cpu_ops for non x86 architectures and maybe even
optimize the x86 variants if interrupts also can detect critical sections
and restart at defined points.



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