Re: [PATCH tip/core/rcu 0/16] RCU-tasks implementation
From: Paul E. McKenney
Date: Tue Aug 12 2014 - 19:58:19 EST
On Mon, Aug 11, 2014 at 03:48:40PM -0700, Paul E. McKenney wrote:
> 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.
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