Messages in this thread Patch in this message |  | | From | Chris Metcalf <> | Subject | [PATCH v4 1/2] nohz: add tick_nohz_full_cpumask_or() and _andnot() APIs | Date | Thu, 9 Apr 2015 13:00:38 -0400 |
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The "andnot" API is useful, for example, to modify a cpumask to avoid the nohz cores so that interrupts aren't sent to them.
Likewise the "or" API is useful to modify a cpumask indicating some special nohz-type functionality so that the nohz cores are automatically added to that set.
Signed-off-by: Chris Metcalf <cmetcalf@ezchip.com> --- v4: update accessor names to make them clearer [PeterZ]
v3: no change here, just in part 2/2.
v2: put the "...set_cpus" API together with the change to init_sched_domains() so that they can go into the timer tree independently of other changes in my tree.
include/linux/tick.h | 14 ++++++++++++++ 1 file changed, 14 insertions(+)
diff --git a/include/linux/tick.h b/include/linux/tick.h index 9c085dc12ae9..ecc24e3a6fa2 100644 --- a/include/linux/tick.h +++ b/include/linux/tick.h @@ -186,6 +186,18 @@ static inline bool tick_nohz_full_cpu(int cpu) return cpumask_test_cpu(cpu, tick_nohz_full_mask); } +static inline void tick_nohz_full_cpumask_andnot(struct cpumask *mask) +{ + if (tick_nohz_full_enabled()) + cpumask_andnot(mask, mask, tick_nohz_full_mask); +} + +static inline void tick_nohz_full_cpumask_or(struct cpumask *mask) +{ + if (tick_nohz_full_enabled()) + cpumask_or(mask, mask, tick_nohz_full_mask); +} + extern void __tick_nohz_full_check(void); extern void tick_nohz_full_kick(void); extern void tick_nohz_full_kick_cpu(int cpu); @@ -194,6 +206,8 @@ extern void __tick_nohz_task_switch(struct task_struct *tsk); #else 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_cpumask_andnot(struct cpumask *mask) { } +static inline void tick_nohz_full_cpumask_or(struct cpumask *mask) { } static inline void __tick_nohz_full_check(void) { } static inline void tick_nohz_full_kick_cpu(int cpu) { } static inline void tick_nohz_full_kick(void) { } -- 2.1.2
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