linux-kernel - Re: [PATCH tip/core/rcu 22/55] rcu: Add grace-period, quiescent-state, and call

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Message-ID: <20111024120231.GC2273@linux.vnet.ibm.com>
Date:	Mon, 24 Oct 2011 05:02:31 -0700
From:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
To:	Josh Triplett <josh@...htriplett.org>
Cc:	linux-kernel@...r.kernel.org, mingo@...e.hu, laijs@...fujitsu.com,
	dipankar@...ibm.com, akpm@...ux-foundation.org,
	mathieu.desnoyers@...ymtl.ca, niv@...ibm.com, tglx@...utronix.de,
	peterz@...radead.org, rostedt@...dmis.org, Valdis.Kletnieks@...edu,
	dhowells@...hat.com, eric.dumazet@...il.com, darren@...art.com,
	patches@...aro.org, "Paul E. McKenney" <paul.mckenney@...aro.org>
Subject: Re: [PATCH tip/core/rcu 22/55] rcu: Add grace-period,
 quiescent-state, and call_rcu trace events

On Sun, Oct 16, 2011 at 06:33:53PM -0700, Josh Triplett wrote:
> On Tue, Sep 06, 2011 at 11:00:16AM -0700, Paul E. McKenney wrote:
> > From: Paul E. McKenney <paul.mckenney@...aro.org>
> > 
> > Add trace events to record grace-period start and end, quiescent states,
> > CPUs noticing grace-period start and end, grace-period initialization,
> > call_rcu() invocation, tasks blocking in RCU read-side critical sections,
> > tasks exiting those same critical sections, force_quiescent_state()
> > detection of dyntick-idle and offline CPUs, CPUs entering and leaving
> > dyntick-idle mode (except from NMIs), CPUs coming online and going
> > offline, and CPUs being kicked for staying in dyntick-idle mode for too
> > long (as in many weeks, even on 32-bit systems).
> > 
> > Signed-off-by: Paul E. McKenney <paul.mckenney@...aro.org>
> > Signed-off-by: Paul E. McKenney <paulmck@...ux.vnet.ibm.com>
> > 
> > rcu: Add the rcu flavor to callback trace events
> > 
> > The earlier trace events for registering RCU callbacks and for invoking
> > them did not include the RCU flavor (rcu_bh, rcu_preempt, or rcu_sched).
> > This commit adds the RCU flavor to those trace events.
> > 
> > Signed-off-by: Paul E. McKenney <paulmck@...ux.vnet.ibm.com>
> 
> Did you intend for this commit message to contain two full commit
> messages, and three signoffs from you?

No, messed up a rebase.  <red face>

> Also, the subject doesn't seem to cover the second half of the commit
> message.

This is indeed the first set of trace events where the name of the RCU
flavor was important.

							Thanx, Paul

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