Re: [RFC PATCH 0/6] stop_machine: kill stop_cpus_mutex and stop_cpus_lock

From	Oleg Nesterov <oleg@redhat.com>
Newsgroups	linux.kernel
Subject	Re: [RFC PATCH 0/6] stop_machine: kill stop_cpus_mutex and stop_cpus_lock
Date	2015-06-30 03:10 +0200
Message-ID	<pGSdH-3ix-13@gated-at.bofh.it> (permalink)
References	<pFrpf-1YQ-3@gated-at.bofh.it> <pFAVA-76D-11@gated-at.bofh.it> <pFIJt-1mm-21@gated-at.bofh.it> <pGCVl-6kZ-23@gated-at.bofh.it>
Organization	linux.* mail to news gateway

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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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[RFC PATCH 0/6] stop_machine: kill stop_cpus_mutex and  stop_cpus_lock Oleg Nesterov <oleg@redhat.com> - 2015-06-26 04:20 +0200
  Re: [RFC PATCH 0/6] stop_machine: kill stop_cpus_mutex and  stop_cpus_lock Oleg Nesterov <oleg@redhat.com> - 2015-06-26 04:40 +0200
  Re: [RFC PATCH 0/6] stop_machine: kill stop_cpus_mutex and  stop_cpus_lock Oleg Nesterov <oleg@redhat.com> - 2015-06-29 06:10 +0200
    Re: [RFC PATCH 0/6] stop_machine: kill stop_cpus_mutex and  stop_cpus_lock Oleg Nesterov <oleg@redhat.com> - 2015-06-30 03:10 +0200
  Re: [RFC PATCH 0/6] stop_machine: kill stop_cpus_mutex and  stop_cpus_lock Oleg Nesterov <oleg@redhat.com> - 2015-06-30 03:10 +0200

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