OpenCloudOS-Kernel/kernel/rcu
Paul E. McKenney 1be0085b51 rcu: Don't initiate RCU priority boosting on root rcu_node
Because there is no longer any preempted tasks on the root rcu_node, and
because there is no longer ever an rcub kthread for the root rcu_node,
this commit drops the code in force_qs_rnp() that attempts to awaken
the non-existent root rcub kthread.  This is strictly a performance
enhancement, removing a root rcu_node ->lock acquisition and release
along with some tests in rcu_initiate_boost(), ending with the test that
notes that there is no rcub kthread.

Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
2015-01-06 11:02:48 -08:00
..
Makefile rcu: Remove redundant TREE_PREEMPT_RCU config option 2014-10-29 10:20:05 -07:00
rcu.h rcutorture: Add early boot self tests 2014-11-03 19:26:37 -08:00
rcutorture.c rcutorture: Fix rcu_torture_cbflood() memory leak 2014-11-03 19:26:41 -08:00
srcu.c rcu: Eliminate read-modify-write ACCESS_ONCE() calls 2014-07-09 09:14:49 -07:00
tiny.c Merge branches 'torture.2014.11.03a', 'cpu.2014.11.03a', 'doc.2014.11.13a', 'fixes.2014.11.13a', 'signal.2014.10.29a' and 'rt.2014.10.29a' into HEAD 2014-11-13 10:39:04 -08:00
tiny_plugin.h rcu: Protect uses of ->jiffies_stall with ACCESS_ONCE() 2014-04-29 08:44:41 -07:00
tree.c rcu: Don't initiate RCU priority boosting on root rcu_node 2015-01-06 11:02:48 -08:00
tree.h rcu: Don't migrate blocked tasks even if all corresponding CPUs offline 2015-01-06 11:02:44 -08:00
tree_plugin.h rcu: Don't spawn rcub kthreads on root rcu_node structure 2015-01-06 11:02:47 -08:00
tree_trace.c rcu: Stop tracking FSF's postal address 2014-02-17 15:01:37 -08:00
update.c Merge branches 'torture.2014.11.03a', 'cpu.2014.11.03a', 'doc.2014.11.13a', 'fixes.2014.11.13a', 'signal.2014.10.29a' and 'rt.2014.10.29a' into HEAD 2014-11-13 10:39:04 -08:00