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authorFrederic Weisbecker <fweisbec@gmail.com>2013-07-10 02:44:35 +0200
committerFrederic Weisbecker <fweisbec@gmail.com>2013-08-14 17:14:46 +0200
commit48d6a816a8bf36e2a197c322697323003bdc1cfe (patch)
tree6a51b602ec4451b8443b2b58337e9a55c84ceb48 /kernel/sched/cputime.c
parentad65782fba507d91a0a98f519b59e79cac1b474c (diff)
context_tracking: Optimize guest APIs off case with static key
Optimize guest entry/exit APIs with static keys. This minimize the overhead for those who enable CONFIG_NO_HZ_FULL without always using it. Having no range passed to nohz_full= should result in the probes overhead to be minimized. Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com> Cc: Steven Rostedt <rostedt@goodmis.org> Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Cc: Ingo Molnar <mingo@kernel.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Borislav Petkov <bp@alien8.de> Cc: Li Zhong <zhong@linux.vnet.ibm.com> Cc: Mike Galbraith <efault@gmx.de> Cc: Kevin Hilman <khilman@linaro.org>
Diffstat (limited to 'kernel/sched/cputime.c')
-rw-r--r--kernel/sched/cputime.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/kernel/sched/cputime.c b/kernel/sched/cputime.c
index 223a35efa0a6..bb6b29a3067c 100644
--- a/kernel/sched/cputime.c
+++ b/kernel/sched/cputime.c
@@ -724,6 +724,7 @@ void vtime_guest_enter(struct task_struct *tsk)
current->flags |= PF_VCPU;
write_sequnlock(&tsk->vtime_seqlock);
}
+EXPORT_SYMBOL_GPL(vtime_guest_enter);
void vtime_guest_exit(struct task_struct *tsk)
{
@@ -732,6 +733,7 @@ void vtime_guest_exit(struct task_struct *tsk)
current->flags &= ~PF_VCPU;
write_sequnlock(&tsk->vtime_seqlock);
}
+EXPORT_SYMBOL_GPL(vtime_guest_exit);
void vtime_account_idle(struct task_struct *tsk)
{