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vtime: Optimize full dynticks accounting off case with static keys

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If no CPU is in the full dynticks range, we can avoid the full
dynticks cputime accounting through generic vtime along with its
overhead and use the traditional tick based accounting instead.

Let's do this and nope the off case with static keys.

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 2013-07-12 03:10:15 +02:00
parent a5725ac23b
commit b049340613
3 changed files with 67 additions and 31 deletions
Download patch file Download diff file Expand all files Collapse all files

6
include/linux/context_tracking.h
View file

@ -74,8 +74,7 @@ static inline void context_tracking_init(void) { }
#ifdef CONFIG_VIRT_CPU_ACCOUNTING_GEN
static inline void guest_enter(void)
{
if (static_key_false(&context_tracking_enabled) &&
vtime_accounting_enabled())
if (vtime_accounting_enabled())
vtime_guest_enter(current);
else
current->flags |= PF_VCPU;
@ -83,8 +82,7 @@ static inline void guest_enter(void)
static inline void guest_exit(void)
{
if (static_key_false(&context_tracking_enabled) &&
vtime_accounting_enabled())
if (vtime_accounting_enabled())
vtime_guest_exit(current);
else
current->flags &= ~PF_VCPU;