linux-kernel - Re: [RFC][PATCH 4/4] Rename lock_cpu_hotplug/unlock_cpu

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Message-ID: <20060824150026.GA14853@elte.hu>
Date:	Thu, 24 Aug 2006 17:00:26 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Nick Piggin <nickpiggin@...oo.com.au>
Cc:	Arjan van de Ven <arjan@...radead.org>, ego@...ibm.com,
	rusty@...tcorp.com.au, torvalds@...l.org, akpm@...l.org,
	linux-kernel@...r.kernel.org, arjan@...el.linux.com,
	davej@...hat.com, dipankar@...ibm.com, vatsa@...ibm.com,
	ashok.raj@...el.com
Subject: Re: [RFC][PATCH 4/4] Rename lock_cpu_hotplug/unlock_cpu_hotplug


* Nick Piggin <nickpiggin@...oo.com.au> wrote:

> It really is just like a reentrant rw semaphore... I don't see the 
> point of the name change, but I guess we don't like reentrant locks so 
> calling it something else might go down better with Linus ;)

what would fit best is a per-cpu scalable (on the read-side) 
self-reentrant rw mutex. We are doing cpu hotplug locking in things like 
fork or the slab code, while most boxes will do a CPU hotplug event only 
once in the kernel's lifetime (during bootup), so a classic global 
read-write lock is unjustified.

	Ingo
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