linux-kernel - Re: [RFC][PATCH 0/5] Optimize percpu-rwsem

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Message-ID: <20150527065349.GS3644@twins.programming.kicks-ass.net>
Date:	Wed, 27 May 2015 08:53:49 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Davidlohr Bueso <dave@...olabs.net>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Oleg Nesterov <oleg@...hat.com>,
	Paul McKenney <paulmck@...ux.vnet.ibm.com>,
	Tejun Heo <tj@...nel.org>, Ingo Molnar <mingo@...hat.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	der.herr@...r.at
Subject: Re: [RFC][PATCH 0/5] Optimize percpu-rwsem

On Tue, May 26, 2015 at 11:42:11AM -0700, Davidlohr Bueso wrote:

> Instead of dropping percpu-rwsem, I was thinking we could instead look
> for opportunities to convert new users, for instance shinkers, where the
> write lock is also taken just for register and unregister purposes,
> similar to uprobes.

Another 'obvious' one would be the cpu hotplug lock. That's basically
the same locking primitive with just a wee little difference.

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