linux-kernel - Re: [RFC PATCH 00/11] rcu: Userspace RCU extended quiescent state v2

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Message-ID: <20120716225733.GB28744@somewhere>
Date:	Tue, 17 Jul 2012 00:57:36 +0200
From:	Frederic Weisbecker <fweisbec@...il.com>
To:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Alessio Igor Bogani <abogani@...nel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Avi Kivity <avi@...hat.com>,
	Chris Metcalf <cmetcalf@...era.com>,
	Christoph Lameter <cl@...ux.com>,
	Geoff Levand <geoff@...radead.org>,
	Gilad Ben Yossef <gilad@...yossef.com>,
	Hakan Akkan <hakanakkan@...il.com>,
	"H. Peter Anvin" <hpa@...or.com>, Ingo Molnar <mingo@...nel.org>,
	Josh Triplett <josh@...htriplett.org>,
	Kevin Hilman <khilman@...com>,
	Max Krasnyansky <maxk@...lcomm.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Stephen Hemminger <shemminger@...tta.com>,
	Steven Rostedt <rostedt@...dmis.org>,
	Sven-Thorsten Dietrich <thebigcorporation@...il.com>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [RFC PATCH 00/11] rcu: Userspace RCU extended quiescent state v2

On Mon, Jul 16, 2012 at 03:15:56PM -0700, Paul E. McKenney wrote:
> On Wed, Jul 11, 2012 at 08:26:29PM +0200, Frederic Weisbecker wrote:
> > Hi,
> > 
> > There are significant changes this time. I reverted back to using
> > a TIF flag to hook on syscalls slow path and put the hooks on
> > high level exception handlers instead of low level ones.
> > 
> > It makes the code more portable between x86-32 and x86-64, it
> > makes the hooks clearer and easier to review and the overhead
> > is lowered in the off-case. This can be even better if we use
> > jump labels later.
> 
> Thank you, Frederic, I have queued these:
> 
> git://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu.git rcu/idle
> 
> I had to rework patch 4 a bit to take into account that I dropped the
> rcu_switch_from() patch, please check it to make sure that I didn't
> rework it out of existence.
> 
> 							Thanx, Paul

Ok so it crashed once and I got 3 successful reboots afterward.
Not sure what was the issue, not sure that's even due to my patches.

Anyway, I'll tell you if I see the crash again.
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