linux-kernel - Re: [PATCH tip/core/rcu 0/16] RCU-tasks implementation

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Message-ID: <20140812235756.GA22698@linux.vnet.ibm.com>
Date:	Tue, 12 Aug 2014 16:57:56 -0700
From:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
To:	linux-kernel@...r.kernel.org
Cc:	mingo@...nel.org, laijs@...fujitsu.com, dipankar@...ibm.com,
	akpm@...ux-foundation.org, mathieu.desnoyers@...icios.com,
	josh@...htriplett.org, tglx@...utronix.de, peterz@...radead.org,
	rostedt@...dmis.org, dhowells@...hat.com, edumazet@...gle.com,
	dvhart@...ux.intel.com, fweisbec@...il.com, oleg@...hat.com,
	bobby.prani@...il.com
Subject: Re: [PATCH tip/core/rcu 0/16] RCU-tasks implementation

On Mon, Aug 11, 2014 at 03:48:40PM -0700, Paul E. McKenney wrote:
> Hello!
> 
> This series provides v5 of a prototype of an RCU-tasks implementation,
> which has been requested to assist with tramopoline removal.  This flavor
> of RCU is task-based rather than CPU-based, and has voluntary context
> switch, usermode execution, and the idle loops as its only quiescent
> states.  This selection of quiescent states ensures that at the end
> of a grace period, there will no longer be any tasks depending on a
> trampoline that was removed before the beginning of that grace period.
> This works because such trampolines do not contain function calls,
> do not contain voluntary context switches, do not switch to usermode,
> and do not switch to idle.

[ . . . ]

> o	There are probably still bugs.

And there probably are, but this version passes 10-hour rcutorture tests
in a few configurations, so getting reasonably robust.

							Thanx, Paul

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