linux-kernel - Re: [PATCH tip/core/rcu 0/6] rcu: fix synchronize_rcu

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Date:	Thu, 15 Oct 2009 13:19:44 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Josh Triplett <josh@...htriplett.org>
Cc:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	linux-kernel@...r.kernel.org, laijs@...fujitsu.com,
	dipankar@...ibm.com, akpm@...ux-foundation.org,
	mathieu.desnoyers@...ymtl.ca, dvhltc@...ibm.com, niv@...ibm.com,
	tglx@...utronix.de, peterz@...radead.org, rostedt@...dmis.org,
	Valdis.Kletnieks@...edu, dhowells@...hat.com, npiggin@...e.de,
	jens.axboe@...cle.com
Subject: Re: [PATCH tip/core/rcu 0/6] rcu: fix synchronize_rcu_expedited(),
	update docs, improve perf


* Josh Triplett <josh@...htriplett.org> wrote:

> On Thu, Oct 15, 2009 at 11:21:55AM +0200, Ingo Molnar wrote:
> > * Paul E. McKenney <paulmck@...ux.vnet.ibm.com> wrote:
> > 
> > > This patchset contains a bug fix, a performance improvement, and 
> > > documentation updates:
> > > 
> > > o	Update Documentation/RCU/trace.txt to reflect recent changes
> > > 	(including the removal of rcupreempt.c).
> > 
> > i've applied this to the .33 queue.
> 
> I realize this only represents a documentation change, but it updates 
> the documentation to match the code in 2.6.32, which seems worth 
> doing.
> 
> > > o	Add the new rnp->blocked_tasks field to the rcuhier trace file
> > > 	in debugfs.
> > > 
> > > o	Update the Documentation/RCU/trace.txt documentation to include
> > > 	the rnp->blocked_tasks tracing.
> > 
> > i've applied these to the .33 queue as well. (both tracing and 
> > documentation is not urgent material.) I also did minor edits to the 
> > changelogs.
> 
> Those who debug RCU-related issues would disagree that having adequate 
> tracing information proves non-urgent. :) The tracing information this 
> adds proves essential for debugging issues with the new hierarchical 
> RCU.  (And the documentation patch just documents the added tracing 
> information, so both should go together as a unit; actually, perhaps 
> they should get merged.)

No, we generally dont do such changes so late in -rc's (these would hit 
upstream in -rc6 - which is too late).

People doing development will use the latest RCU tree so the practical 
impact is small. Furthermore, we had a higher than usual rate of 
post-rc1 RCU changes in this cycle already, it needs to cool down a bit.

	Ingo
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