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From: "Paul E. McKenney" <paulmck@linux.vnet.ibm.com>
To: Steven Rostedt <rostedt@goodmis.org>
Cc: linux-kernel@vger.kernel.org,
	Linus Torvalds <torvalds@linux-foundation.org>,
	Ingo Molnar <mingo@kernel.org>,
	Andrew Morton <akpm@linux-foundation.org>,
	Thomas Gleixner <tglx@linutronix.de>,
	Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Subject: Re: [PATCH 1/3] tracepoints: Do not use call_rcu_sched() before early_initcall()
Date: Sun, 14 Dec 2014 12:23:40 -0800
Message-ID: <20141214202340.GH5310@linux.vnet.ibm.com> (raw)
In-Reply-To: <20141214132556.6f8d6fb9@gandalf.local.home>

On Sun, Dec 14, 2014 at 01:25:56PM -0500, Steven Rostedt wrote:
> On Sun, 14 Dec 2014 10:18:35 -0800
> "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> wrote:
> 
> > > With your feed back, and because I would like this to go into 3.19, I
> > > would like to keep the current patch as is (with the read_mostly
> > > update, which I'm currently testing). We can always change it later
> > > after call_rcu() has been changed.
> > 
> > Completely agreed!  ;-)
> 
> For this late in the game, we need to play it safe.
> 
> I got rid of my tracepoint patch and moved trace_init() to after
> rcu_init(), which I think is good enough for Thomas. Thomas?
> 
> I'll start testing that now.

That should work as well.

> Later, if you could add a rcu_init() version that lets us call
> call_rcu_sched() just after mm_init() then we could move trace_init()
> up a bit more.

OK, will put something together for that.  Good to hear that this is
not needed indefinitely early -- that would be a bit harder.  ;-)

							Thanx, Paul


  reply index

Thread overview: 20+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2014-12-14 16:41 [PATCH 0/3] tracing: Enable tracepoints early and allow printk to use them Steven Rostedt
2014-12-14 16:41 ` [PATCH 1/3] tracepoints: Do not use call_rcu_sched() before early_initcall() Steven Rostedt
2014-12-14 16:53   ` Steven Rostedt
2014-12-14 18:08     ` Paul E. McKenney
2014-12-14 18:15       ` Steven Rostedt
2014-12-14 18:18         ` Paul E. McKenney
2014-12-14 18:25           ` Steven Rostedt
2014-12-14 20:23             ` Paul E. McKenney [this message]
2014-12-14 17:05   ` Mathieu Desnoyers
2014-12-14 17:14     ` Steven Rostedt
2014-12-14 17:21       ` Steven Rostedt
2014-12-14 17:29         ` Mathieu Desnoyers
2014-12-14 17:44           ` Steven Rostedt
2014-12-14 18:13             ` Paul E. McKenney
2014-12-14 16:41 ` [PATCH 2/3] tracing: Move enabling tracepoints to just after mm_init() Steven Rostedt
2014-12-14 18:14   ` Paul E. McKenney
2014-12-14 18:20     ` Steven Rostedt
2014-12-14 20:26       ` Paul E. McKenney
2014-12-14 16:41 ` [PATCH 3/3] tracing: Add tp_printk cmdline to have tracepoints go to printk() Steven Rostedt
2014-12-14 17:07 ` [PATCH 0/3] tracing: Enable tracepoints early and allow printk to use them Steven Rostedt

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