Messages in this thread | | | Date | Mon, 10 Sep 2012 23:30:37 +0200 | From | Frederic Weisbecker <> | Subject | Re: [PATCH tip/core/rcu 08/26] x86: Syscall hooks for userspace RCU extended QS |
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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 <fweisbec@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 <fweisbec@gmail.com> > > Cc: Alessio Igor Bogani <abogani@kernel.org> > > Cc: Andrew Morton <akpm@linux-foundation.org> > > Cc: Avi Kivity <avi@redhat.com> > > Cc: Chris Metcalf <cmetcalf@tilera.com> > > Cc: Christoph Lameter <cl@linux.com> > > Cc: Geoff Levand <geoff@infradead.org> > > Cc: Gilad Ben Yossef <gilad@benyossef.com> > > Cc: Hakan Akkan <hakanakkan@gmail.com> > > Cc: H. Peter Anvin <hpa@zytor.com> > > Cc: Ingo Molnar <mingo@kernel.org> > > Cc: Josh Triplett <josh@joshtriplett.org> > > Cc: Kevin Hilman <khilman@ti.com> > > Cc: Max Krasnyansky <maxk@qualcomm.com> > > Cc: Peter Zijlstra <peterz@infradead.org> > > Cc: Stephen Hemminger <shemminger@vyatta.com> > > Cc: Steven Rostedt <rostedt@goodmis.org> > > Cc: Sven-Thorsten Dietrich <thebigcorporation@gmail.com> > > Cc: Thomas Gleixner <tglx@linutronix.de> > > Signed-off-by: Paul E. McKenney <paulmck@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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