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authorFrederic Weisbecker <fweisbec@gmail.com>2012-11-27 19:33:25 +0100
committerPaul E. McKenney <paulmck@linux.vnet.ibm.com>2012-11-30 11:40:07 -0800
commit91d1aa43d30505b0b825db8898ffc80a8eca96c7 (patch)
tree911636f846d800c8a44efd540842dc726ec7c191 /kernel/sched
parent4e79752c25ec221ac1e28f8875b539ed7631a0db (diff)
downloadlinaro-lsk-91d1aa43d30505b0b825db8898ffc80a8eca96c7.tar.gz
context_tracking: New context tracking susbsystem
Create a new subsystem that probes on kernel boundaries to keep track of the transitions between level contexts with two basic initial contexts: user or kernel. This is an abstraction of some RCU code that use such tracking to implement its userspace extended quiescent state. We need to pull this up from RCU into this new level of indirection because this tracking is also going to be used to implement an "on demand" generic virtual cputime accounting. A necessary step to shutdown the tick while still accounting the cputime. Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: H. Peter Anvin <hpa@zytor.com> Cc: Ingo Molnar <mingo@kernel.org> Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Steven Rostedt <rostedt@goodmis.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Li Zhong <zhong@linux.vnet.ibm.com> Cc: Gilad Ben-Yossef <gilad@benyossef.com> Reviewed-by: Steven Rostedt <rostedt@goodmis.org> [ paulmck: fix whitespace error and email address. ] Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Diffstat (limited to 'kernel/sched')
-rw-r--r--kernel/sched/core.c11
1 files changed, 6 insertions, 5 deletions
diff --git a/kernel/sched/core.c b/kernel/sched/core.c
index 36f260864f6..80f80dfca70 100644
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -72,6 +72,7 @@
#include <linux/slab.h>
#include <linux/init_task.h>
#include <linux/binfmts.h>
+#include <linux/context_tracking.h>
#include <asm/switch_to.h>
#include <asm/tlb.h>
@@ -1886,8 +1887,8 @@ context_switch(struct rq *rq, struct task_struct *prev,
spin_release(&rq->lock.dep_map, 1, _THIS_IP_);
#endif
+ context_tracking_task_switch(prev, next);
/* Here we just switch the register state and the stack. */
- rcu_user_hooks_switch(prev, next);
switch_to(prev, next, prev);
barrier();
@@ -2911,7 +2912,7 @@ asmlinkage void __sched schedule(void)
}
EXPORT_SYMBOL(schedule);
-#ifdef CONFIG_RCU_USER_QS
+#ifdef CONFIG_CONTEXT_TRACKING
asmlinkage void __sched schedule_user(void)
{
/*
@@ -2920,9 +2921,9 @@ asmlinkage void __sched schedule_user(void)
* we haven't yet exited the RCU idle mode. Do it here manually until
* we find a better solution.
*/
- rcu_user_exit();
+ user_exit();
schedule();
- rcu_user_enter();
+ user_enter();
}
#endif
@@ -3027,7 +3028,7 @@ asmlinkage void __sched preempt_schedule_irq(void)
/* Catch callers which need to be fixed */
BUG_ON(ti->preempt_count || !irqs_disabled());
- rcu_user_exit();
+ user_exit();
do {
add_preempt_count(PREEMPT_ACTIVE);
local_irq_enable();