linux-kernel - Re: [PATCH v3 tip/core/rcu 1/9] rcu: Add call_rcu

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Message-ID: <20140804192810.GR8101@linux.vnet.ibm.com>
Date:	Mon, 4 Aug 2014 12:28:10 -0700
From:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
To:	Oleg Nesterov <oleg@...hat.com>
Cc:	linux-kernel@...r.kernel.org, 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, bobby.prani@...il.com
Subject: Re: [PATCH v3 tip/core/rcu 1/9] rcu: Add call_rcu_tasks()

On Mon, Aug 04, 2014 at 03:32:21PM +0200, Oleg Nesterov wrote:
> On 08/03, Paul E. McKenney wrote:
> >
> > On Sun, Aug 03, 2014 at 03:33:18PM +0200, Oleg Nesterov wrote:
> > > It seems that you need another global list, a task should be visible on that
> > > list until exit_rcu().
> >
> > As in create another global list that all tasks are added to when created
> > and then remved from when they exit?
> 
> This is what I meant, although I hoped there is a better solution. The obvious
> problem is locking.
> 
> And at least Lai's idea looks certainly better to me.

OK, so I checked out my earlier concern about the group leader going away.
It looks like the group leader now sticks around until all threads in
the group have exited, which is a nice change from the behavior I was
(perhaps incorrectly) recalling!

							Thanx, Paul

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