linux-kernel - Re: [PATCH] rcu_sync: simplify the state machine, introduce __rcu_sync

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Message-ID: <20160725172626.GC24149@redhat.com>
Date:	Mon, 25 Jul 2016 19:26:26 +0200
From:	Oleg Nesterov <oleg@...hat.com>
To:	John Stultz <john.stultz@...aro.org>
Cc:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...nel.org>,
	lkml <linux-kernel@...r.kernel.org>, Tejun Heo <tj@...nel.org>,
	Dmitry Shmidt <dimitrysh@...gle.com>,
	Rom Lemarchand <romlem@...gle.com>,
	Colin Cross <ccross@...gle.com>, Todd Kjos <tkjos@...gle.com>
Subject: Re: [PATCH] rcu_sync: simplify the state machine, introduce
 __rcu_sync_enter()

On 07/25, John Stultz wrote:
>
> Can you also make clear which patches of PeterZ's I should be adding
> as well for testing?  I've lost the plot as to what goes with what..

Well, my understanding is that Peter is going to send v2 with some minor
changes, I am going to send this patch on top of his series.

In particular 2/2 should set GP_PASSED rather than !GP_IDLE. It would be
nice to also rename rcu_sync_sabotage() to rcu_sync_enter_start(), this
will save another change in cgroup.c, but this is minor.

Oleg.