Paul E. McKenney 3fbfbf7a3b rcu: Add callback-free CPUs ... RCU callback execution can add significant OS jitter and also can degrade both scheduling latency and, in asymmetric multiprocessors, energy efficiency. This commit therefore adds the ability for selected CPUs ("rcu_nocbs=" boot parameter) to have their callbacks offloaded to kthreads. If the "rcu_nocb_poll" boot parameter is also specified, these kthreads will do polling, removing the need for the offloaded CPUs to do wakeups. At least one CPU must be doing normal callback processing: currently CPU 0 cannot be selected as a no-CBs CPU. In addition, attempts to offline the last normal-CBs CPU will fail. This feature was inspired by Jim Houston's and Joe Korty's JRCU, and this commit includes fixes to problems located by Fengguang Wu's kbuild test robot. [ paulmck: Added gfp.h include file as suggested by Fengguang Wu. ] Signed-off-by: Paul E. McKenney <paul.mckenney@linaro.org> Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>		2012-11-16 10:05:56 -08:00
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events	rcu: Add callback-free CPUs	2012-11-16 10:05:56 -08:00
define_trace.h	treewide: fix comment/printk/variable typos	2012-09-01 10:33:05 -07:00
ftrace.h	perf/trace: Add ability to set a target task for events	2012-07-31 17:02:05 +02:00
syscall.h	tracing: Use a global field list for all syscall exit events	2010-06-28 17:12:44 -04:00