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| author | Frederic Weisbecker <fweisbec@gmail.com> | 2013-07-11 19:42:13 +0200 |
|---|---|---|
| committer | Frederic Weisbecker <fweisbec@gmail.com> | 2013-08-14 17:14:47 +0200 |
| commit | 73d424f9af7b571276e6284617cb59726d47bf12 (patch) | |
| tree | 6ee47dd0327e67c8514ebfefc12728b030e79ae5 /kernel/context_tracking.c | |
| parent | 48d6a816a8bf36e2a197c322697323003bdc1cfe (diff) | |
| download | lwn-73d424f9af7b571276e6284617cb59726d47bf12.tar.gz lwn-73d424f9af7b571276e6284617cb59726d47bf12.zip | |
context_tracking: Optimize context switch off case with static keys
No need for syscall slowpath if no CPU is full dynticks,
rather nop this in this case.
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/context_tracking.c')
| -rw-r--r-- | kernel/context_tracking.c | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/kernel/context_tracking.c b/kernel/context_tracking.c index b6a186c4b886..c17822673c39 100644 --- a/kernel/context_tracking.c +++ b/kernel/context_tracking.c @@ -166,7 +166,7 @@ void context_tracking_user_exit(void) } /** - * context_tracking_task_switch - context switch the syscall callbacks + * __context_tracking_task_switch - context switch the syscall callbacks * @prev: the task that is being switched out * @next: the task that is being switched in * @@ -178,8 +178,8 @@ void context_tracking_user_exit(void) * migrate to some CPU that doesn't do the context tracking. As such the TIF * flag may not be desired there. */ -void context_tracking_task_switch(struct task_struct *prev, - struct task_struct *next) +void __context_tracking_task_switch(struct task_struct *prev, + struct task_struct *next) { clear_tsk_thread_flag(prev, TIF_NOHZ); set_tsk_thread_flag(next, TIF_NOHZ); |