linux-kernel - Re: [RFC][PATCH 7/9] rbtree: Implement generic latch

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Message-ID: <20150317172438.GH23123@twins.programming.kicks-ass.net>
Date:	Tue, 17 Mar 2015 18:24:38 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
Cc:	mingo@...nel.org, rusty@...tcorp.com.au,
	mathieu.desnoyers@...icios.com, oleg@...hat.com,
	linux-kernel@...r.kernel.org, andi@...stfloor.org,
	rostedt@...dmis.org, tglx@...utronix.de,
	Michel Lespinasse <walken@...gle.com>,
	Andrea Arcangeli <aarcange@...hat.com>,
	David Woodhouse <David.Woodhouse@...el.com>,
	Rik van Riel <riel@...hat.com>
Subject: Re: [RFC][PATCH 7/9] rbtree: Implement generic latch_tree

On Mon, Mar 02, 2015 at 11:53:32AM -0800, Paul E. McKenney wrote:
> On Sat, Feb 28, 2015 at 10:24:54PM +0100, Peter Zijlstra wrote:
> > Implement a latched RB-tree in order to get RCU style lookups.
> > 
> > Cc: Michel Lespinasse <walken@...gle.com>
> > Cc: Andrea Arcangeli <aarcange@...hat.com>
> > Cc: David Woodhouse <David.Woodhouse@...el.com>
> > Cc: Rik van Riel <riel@...hat.com>
> > Cc: Mathieu Desnoyers <mathieu.desnoyers@...icios.com>
> > Cc: "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
> > Cc: Oleg Nesterov <oleg@...hat.com>
> > Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
> 
> The caller of latch_tree_erase() is required to wait for a grace period
> before freeing the erased nodes?  Or am I missing something subtle here?

Correct; let me clarify this.
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