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Merge branch 'timers/nohz-v3' of git://git.kernel.org/pub/scm/linux/kernel/git/frederic/linux-dynticks into timers/nohz

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Pull nohz improvements from Frederic Weisbecker:

 " It mostly contains fixes and full dynticks off-case optimizations. I believe that
   distros want to enable this feature so it seems important to optimize the case
   where the "nohz_full=" parameter is empty. ie: I'm trying to remove any performance
   regression that comes with NO_HZ_FULL=y when the feature is not used.

   This patchset improves the current situation a lot (off-case appears to be around 11% faster
   with hackbench, although I guess it may vary depending on the configuration but it should be
   significantly faster in any case) now there is still some work to do: I can still observe a
   remaining loss of 1.6% throughput seen with hackbench compared to CONFIG_NO_HZ_FULL=n. "

Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Ingo Molnar
2013-08-14 17:58:56 +02:00
parent d4e4ab86bc d13508f944
commit 6f1d657668
22 changed files with 548 additions and 332 deletions
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45
include/linux/tick.h
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@@ -10,6 +10,8 @@
#include <linux/irqflags.h>
#include <linux/percpu.h>
#include <linux/hrtimer.h>
#include <linux/context_tracking_state.h>
#include <linux/cpumask.h>
#ifdef CONFIG_GENERIC_CLOCKEVENTS
@@ -158,20 +160,51 @@ static inline u64 get_cpu_iowait_time_us(int cpu, u64 *unused) { return -1; }
# endif /* !CONFIG_NO_HZ_COMMON */
#ifdef CONFIG_NO_HZ_FULL
extern bool tick_nohz_full_running;
extern cpumask_var_t tick_nohz_full_mask;
static inline bool tick_nohz_full_enabled(void)
{
if (!static_key_false(&context_tracking_enabled))
return false;
return tick_nohz_full_running;
}
static inline bool tick_nohz_full_cpu(int cpu)
{
if (!tick_nohz_full_enabled())
return false;
return cpumask_test_cpu(cpu, tick_nohz_full_mask);
}
extern void tick_nohz_init(void);
extern int tick_nohz_full_cpu(int cpu);
extern void tick_nohz_full_check(void);
extern void __tick_nohz_full_check(void);
extern void tick_nohz_full_kick(void);
extern void tick_nohz_full_kick_all(void);
extern void tick_nohz_task_switch(struct task_struct *tsk);
extern void __tick_nohz_task_switch(struct task_struct *tsk);
#else
static inline void tick_nohz_init(void) { }
static inline int tick_nohz_full_cpu(int cpu) { return 0; }
static inline void tick_nohz_full_check(void) { }
static inline bool tick_nohz_full_enabled(void) { return false; }
static inline bool tick_nohz_full_cpu(int cpu) { return false; }
static inline void __tick_nohz_full_check(void) { }
static inline void tick_nohz_full_kick(void) { }
static inline void tick_nohz_full_kick_all(void) { }
static inline void tick_nohz_task_switch(struct task_struct *tsk) { }
static inline void __tick_nohz_task_switch(struct task_struct *tsk) { }
#endif
static inline void tick_nohz_full_check(void)
{
if (tick_nohz_full_enabled())
__tick_nohz_full_check();
}
static inline void tick_nohz_task_switch(struct task_struct *tsk)
{
if (tick_nohz_full_enabled())
__tick_nohz_task_switch(tsk);
}
#endif