linux-kernel - Re: [RFC PATCH 0/6] stop_machine: kill stop_cpus_mutex and stop_cpus

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Message-ID: <20150630010315.GA22559@redhat.com>
Date:	Tue, 30 Jun 2015 03:03:15 +0200
From:	Oleg Nesterov <oleg@...hat.com>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	paulmck@...ux.vnet.ibm.com, tj@...nel.org, mingo@...hat.com,
	der.herr@...r.at, dave@...olabs.net, riel@...hat.com,
	viro@...IV.linux.org.uk, torvalds@...ux-foundation.org,
	linux-kernel@...r.kernel.org
Subject: Re: [RFC PATCH 0/6] stop_machine: kill stop_cpus_mutex and
	stop_cpus_lock

On 06/29, Peter Zijlstra wrote:
>
> On Fri, Jun 26, 2015 at 10:46:12PM +0200, Oleg Nesterov wrote:
>
> > So I am still not convinced... But probably I am too biased ;)
>
> I'm just a tad worried, I don't want to make the relatively cheap
> operation of stop_two_cpus() more expensive to the benefit of
> stop_cpus().

OK. And I have another (simple) idea...

Never say tomorrow, but I will try to re-check and make the patch
tomorrow ;)

But let me send some cleanups first. Plus I believe I found another
stop_machine bug, see the last patch. So I hope these changes make
sense in any case.

Oleg.

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