nohz: New APIs to re-evaluate the tick on full dynticks CPUs
authorFrederic Weisbecker <fweisbec@gmail.com>
Wed, 17 Apr 2013 22:15:40 +0000 (00:15 +0200)
committerFrederic Weisbecker <fweisbec@gmail.com>
Thu, 18 Apr 2013 16:53:34 +0000 (18:53 +0200)
commit76c24fb054b52b34af4dcde589cbb9e2b98fc74c
treebbce968d4f057dce3b028ca5c5b894e68255db02
parent65d798f0f9339ae2c4ebe9480e3260b33382a584
nohz: New APIs to re-evaluate the tick on full dynticks CPUs

Provide two new helpers in order to notify the full dynticks CPUs about
some internal system changes against which they may reconsider the state
of their tick. Some practical examples include: posix cpu timers, perf tick
and sched clock tick.

For now the notifying handler, implemented through IPIs, is a stub
that will be implemented when we get the tick stop/restart infrastructure
in.

Signed-off-by: Frederic Weisbecker <fweisbec@gmail.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: Ingo Molnar <mingo@kernel.org>
Cc: Kevin Hilman <khilman@linaro.org>
Cc: Li Zhong <zhong@linux.vnet.ibm.com>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Cc: Paul Gortmaker <paul.gortmaker@windriver.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
include/linux/tick.h
kernel/time/Kconfig
kernel/time/tick-sched.c