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context_tracking: Optimize guest APIs off case with static key

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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>
This commit is contained in:
Frederic Weisbecker 2013-07-10 02:44:35 +02:00
parent ad65782fba
commit 48d6a816a8
3 changed files with 21 additions and 23 deletions
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19
include/linux/context_tracking.h
View file

@ -95,8 +95,23 @@ static inline void context_tracking_init(void) { }
#ifdef CONFIG_VIRT_CPU_ACCOUNTING_GEN
extern void guest_enter(void);
extern void guest_exit(void);
static inline void guest_enter(void)
{
if (static_key_false(&context_tracking_enabled) &&
vtime_accounting_enabled())
vtime_guest_enter(current);
else
current->flags |= PF_VCPU;
}
static inline void guest_exit(void)
{
if (static_key_false(&context_tracking_enabled) &&
vtime_accounting_enabled())
vtime_guest_exit(current);
else
current->flags &= ~PF_VCPU;
}
#else
static inline void guest_enter(void)
{