linux-kernel - Re: [RFC PATCH 4/5] RCU: Add TASK_RCU

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Date:	Thu, 31 Mar 2011 16:30:05 -0700
From:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
To:	Lai Jiangshan <laijs@...fujitsu.com>
Cc:	Michal Marek <mmarek@...e.cz>,
	Peter Zijlstra <peterz@...radead.org>,
	"H. Peter Anvin" <hpa@...ux.intel.com>,
	Jan Beulich <JBeulich@...ell.com>, Ingo Molnar <mingo@...e.hu>,
	Alexander van Heukelum <heukelum@...tmail.fm>,
	Dipankar Sarma <dipankar@...ibm.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Sam Ravnborg <sam@...nborg.org>,
	David Howells <dhowells@...hat.com>,
	Oleg Nesterov <oleg@...hat.com>,
	Roland McGrath <roland@...hat.com>,
	Serge Hallyn <serue@...ibm.com>, linux-kernel@...r.kernel.org,
	Thomas Gleixner <tglx@...utronix.de>,
	Steven Rostedt <rostedt@...dmis.org>
Subject: Re: [RFC PATCH 4/5] RCU: Add TASK_RCU_OFFSET

On Thu, Mar 31, 2011 at 09:53:21AM +0800, Lai Jiangshan wrote:
> On 03/31/2011 09:21 AM, Paul E. McKenney wrote:
> > On Thu, Mar 31, 2011 at 09:02:20AM +0800, Lai Jiangshan wrote:
> >> On 03/30/2011 07:46 PM, Michal Marek wrote:
> >>> On 30.3.2011 12:57, Peter Zijlstra wrote:
> >>>> On Wed, 2011-03-30 at 12:55 +0200, Michal Marek wrote:
> >>>>> Subject: [PATCH] headers: Allow for lightweight inclusion of task_struct definition
> >>>>>
> >>>>> Factor out a couple of type definitions to <header>_types.h to allow
> >>>>> using task_struct without pulling tons of new dependencies via sched.h.
> >>>>
> >>>> Urgh, not pretty.. so why not clean up sched.h properly? There's way too
> >>>> much cruft in there.
> >>>
> >>> It was a proof-of-concept to show that it is doable to have proper
> >>> definition of task_struct in rcupdate.h. Not an entry for any code
> >>> beauty contest.
> >>>
> >>> Michal
> >>>
> >>
> >> I like this cleanup, could you continue for this hard job? I will help you if required.
> >>
> >> Ingo & Peter - will you accept the patches when it is done.
> >>
> >> Acked-by: Lai Jiangshan <laijs@...fujitsu.com>
> > 
> > I certainly like the idea of being able to inline TREE_PREEMPT_RCU's
> > rcu_read_lock() and rcu_read_unlock() using normal C code!
> > 
> > 							Thanx, Paul
> > 
> 
> kernel-offset.c can be merged to some branch of your tree for
> testing inlined TREE_PREEMPT_RCU's rcu_read_lock() and rcu_read_unlock()
> before the kernel headers splitting is done.
> 
> Can the [patch 1/5] be merged to mainline earlier? could you add it to origin/rcu/next?

Let's first settle on the overall direction, on the off-chance that someone
comes up with an approach that doesn't require task_rcu_struct, or that
requires it to be located somewhere other than include/linux/rcupdate.h.

							Thanx, Paul
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