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| author |   Peter Zijlstra <peterz@infradead.org> | 2017-12-21 15:06:50 +0100 |
|---|---|---|
| committer |   Ingo Molnar <mingo@kernel.org> | 2018-03-09 07:59:19 +0100 |
| commit | 00357f5ec5d67a52a175da6f29f85c2c19d59bc8 (patch) | |
| tree | 53799544850786339539ed2d7f39ff03a1f321b1 /include/linux/sched | |
| parent | sched/fair: Update blocked load from NEWIDLE (diff) | |
| download | linux-dev-00357f5ec5d67a52a175da6f29f85c2c19d59bc8.tar.xz linux-dev-00357f5ec5d67a52a175da6f29f85c2c19d59bc8.zip | |
sched/nohz: Clean up nohz enter/exit
The primary observation is that nohz enter/exit is always from the
current CPU, therefore NOHZ_TICK_STOPPED does not in fact need to be
an atomic.
Secondary is that we appear to have 2 nearly identical hooks in the
nohz enter code, set_cpu_sd_state_idle() and
nohz_balance_enter_idle(). Fold the whole set_cpu_sd_state thing into
nohz_balance_{enter,exit}_idle.
Removes an atomic op from both enter and exit paths.
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'include/linux/sched')
| -rw-r--r-- | include/linux/sched/nohz.h | 2 |
1 files changed, 0 insertions, 2 deletions
diff --git a/include/linux/sched/nohz.h b/include/linux/sched/nohz.h index 094217273ff9..b36f4cf38111 100644 --- a/include/linux/sched/nohz.h +++ b/include/linux/sched/nohz.h @@ -16,11 +16,9 @@ static inline void cpu_load_update_nohz_stop(void) { } #if defined(CONFIG_SMP) && defined(CONFIG_NO_HZ_COMMON) extern void nohz_balance_enter_idle(int cpu); -extern void set_cpu_sd_state_idle(void); extern int get_nohz_timer_target(void); #else static inline void nohz_balance_enter_idle(int cpu) { } -static inline void set_cpu_sd_state_idle(void) { } #endif #ifdef CONFIG_NO_HZ_COMMON |