linux-kernel - Re: [RFC PATCH 3/3] cpu-hotplug: Replace per-subsystem mutexes with get_online

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Message-ID: <20071115163619.GA110@tv-sign.ru>
Date:	Thu, 15 Nov 2007 19:36:19 +0300
From:	Oleg Nesterov <oleg@...sign.ru>
To:	Gautham R Shenoy <ego@...ibm.com>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, Rusty Russel <rusty@...tcorp.com.au>,
	Srivatsa Vaddagiri <vatsa@...ibm.com>,
	Dipankar Sarma <dipankar@...ibm.com>,
	Ingo Molnar <mingo@...e.hu>,
	Paul E McKenney <paulmck@...ibm.com>,
	Richard Gooch <rgooch@...f.csiro.au>,
	Tigran Aivazian <tigran@...azian.fs.co.uk>,
	Shoahua Li <shaohua.li@...ux.com>,
	Ralf Baechle <ralf@...ux-mips.org>,
	Heiko Carstens <heiko.carstens@...ibm.com>,
	Nathan Lynch <ntl@...ox.com>, Paul Jackson <pj@....com>,
	Christoph Lameter <clameter@....com>,
	Pekka Enberg <penberg@...helsinki.fi>,
	Akinobu Mita <akinobu.mita@...il.com>
Subject: Re: [RFC PATCH 3/3] cpu-hotplug: Replace per-subsystem mutexes with get_online_cpus()

On 11/15, Gautham R Shenoy wrote:
>
> This patch converts the known per-subsystem mutexes to get_online_cpus
> put_online_cpus. It also eliminates the CPU_LOCK_ACQUIRE
> and CPU_LOCK_RELEASE hotplug notification events.
> 
> Signed-off-by: Gautham  R Shenoy <ego@...ibm.com>
> ---
>  include/linux/notifier.h |    4 +---
>  kernel/cpu.c             |    4 ----
>  kernel/sched.c           |   25 +++++++++----------------
>  kernel/workqueue.c       |   35 +++++++++++++++--------------------
>  mm/slab.c                |   18 +++++++++++-------

Can't really comment the changes outside the workqueue.c, but imho the
whole series is very good.

Oleg.

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