linux-kernel - Re: [PATCH] context_tracking: New context tracking susbsystem

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Message-ID: <1354067438.6276.92.camel@gandalf.local.home>
Date:	Tue, 27 Nov 2012 20:50:38 -0500
From:	Steven Rostedt <rostedt@...dmis.org>
To:	paulmck@...ux.vnet.ibm.com
Cc:	Frederic Weisbecker <fweisbec@...il.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	"H. Peter Anvin" <hpa@...or.com>, Ingo Molnar <mingo@...nel.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Li Zhong <zhong@...ux.vnet.ibm.com>,
	Gilad.Ben-Yossef.gilad@...yossef.com
Subject: Re: [PATCH] context_tracking: New context tracking susbsystem

On Tue, 2012-11-27 at 16:59 -0800, Paul E. McKenney wrote:
> On Tue, Nov 27, 2012 at 07:33:25PM +0100, Frederic Weisbecker wrote:
> > Create a new subsystem that probes on kernel boundaries
> > to keep track of the transitions between level contexts
> > with two basic initial contexts: user or kernel.
> > 
> > This is an abstraction of some RCU code that use such tracking
> > to implement its userspace extended quiescent state.
> > 
> > We need to pull this up from RCU into this new level of indirection
> > because this tracking is also going to be used to implement an "on
> > demand" generic virtual cputime accounting. A necessary step to
> > shutdown the tick while still accounting the cputime.
> 
> I have queued this, and if it passes tests and inspection will try
> pushing it for 3.8.
> 

You can add my Reviewed-by: Steven Rostedt <rostedt@...dmis.org> if you
like.

-- Steve


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