linux-kernel - Re: [tip:locking/core] locking/rwsem: Fix lock optimistic spinning when owner is not running

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Message-ID: <20150310161637.GG2896@worktop.programming.kicks-ass.net>
Date:	Tue, 10 Mar 2015 17:16:37 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Oleg Nesterov <oleg@...hat.com>,
	"linux-tip-commits@...r.kernel.org" 
	<linux-tip-commits@...r.kernel.org>,
	Davidlohr Bueso <dave@...olabs.net>,
	Peter Anvin <hpa@...or.com>,
	Sasha Levin <sasha.levin@...cle.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Jason Low <jason.low2@...com>,
	Michel Lespinasse <walken@...gle.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Ingo Molnar <mingo@...nel.org>,
	Paul McKenney <paulmck@...ux.vnet.ibm.com>,
	Dave Jones <davej@...emonkey.org.uk>,
	Ming Lei <ming.lei@...onical.com>,
	Tim Chen <tim.c.chen@...ux.intel.com>
Subject: Re: [tip:locking/core] locking/rwsem: Fix lock optimistic spinning
 when owner is not running

On Tue, Mar 10, 2015 at 09:04:23AM -0700, Linus Torvalds wrote:
> 
> I think we should just make 'task_struct_cachep' have SLAB_DESTROY_BY_RCU.

Yes, that'll work. Also for the other cases Oleg found previously I
think.
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