On Fri, Aug 31, 2012 at 04:59:10PM -0700, Josh Triplett wrote:
> On Thu, Aug 30, 2012 at 02:05:25PM -0700, Paul E. McKenney wrote:
> > From: Frederic Weisbecker <fweis...@gmail.com>
> >
> > Add syscall slow path hooks to notify syscall entry
> > and exit on CPUs that want to support userspace RCU
> > extended quiescent state.
> >
> > Signed-off-by: Frederic Weisbecker <fweis...@gmail.com>
> > Cc: Alessio Igor Bogani <abog...@kernel.org>
> > Cc: Andrew Morton <a...@linux-foundation.org>
> > Cc: Avi Kivity <a...@redhat.com>
> > Cc: Chris Metcalf <cmetc...@tilera.com>
> > Cc: Christoph Lameter <c...@linux.com>
> > Cc: Geoff Levand <ge...@infradead.org>
> > Cc: Gilad Ben Yossef <gi...@benyossef.com>
> > Cc: Hakan Akkan <hakanak...@gmail.com>
> > Cc: H. Peter Anvin <h...@zytor.com>
> > Cc: Ingo Molnar <mi...@kernel.org>
> > Cc: Josh Triplett <j...@joshtriplett.org>
> > Cc: Kevin Hilman <khil...@ti.com>
> > Cc: Max Krasnyansky <m...@qualcomm.com>
> > Cc: Peter Zijlstra <pet...@infradead.org>
> > Cc: Stephen Hemminger <shemmin...@vyatta.com>
> > Cc: Steven Rostedt <rost...@goodmis.org>
> > Cc: Sven-Thorsten Dietrich <thebigcorporat...@gmail.com>
> > Cc: Thomas Gleixner <t...@linutronix.de>
> > Signed-off-by: Paul E. McKenney <paul...@linux.vnet.ibm.com>
>
> This seems reasonable; presumably you plan to add something actually
> setting TIF_NOHZ in a subsequent patch series?
Yes, currently this is set by the selftests, see the combination of:
[PATCH tip/core/rcu 07/26] rcu: Switch task's syscall hooks on context
switch
[PATCH tip/core/rcu 14/26] rcu: Userspace RCU extended QS selftest
Later this will be driven by the nohz subsystem.
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