diff options
| author | Qais Yousef <qais.yousef@arm.com> | 2020-03-02 13:27:18 +0000 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2020-03-06 12:57:27 +0100 |
| commit | a1bd02e1f28b1939cac8c64072a0e578c3cbc345 (patch) | |
| tree | b297a940228a68fadde6e97d77f078d3da1e8753 /kernel/sched/cpupri.c | |
| parent | b28bc1e002c23ff8a4999c4a2fb1d4d412bc6f5e (diff) | |
sched/rt: Optimize cpupri_find() on non-heterogenous systems
By introducing a new cpupri_find_fitness() function that takes the
fitness_fn as an argument and only called when asym_system static key is
enabled.
cpupri_find() is now a wrapper function that calls cpupri_find_fitness()
passing NULL as a fitness_fn, hence disabling the logic that handles
fitness by default.
LINK: https://lore.kernel.org/lkml/c0772fca-0a4b-c88d-fdf2-5715fcf8447b@arm.com/
Reported-by: Dietmar Eggemann <dietmar.eggemann@arm.com>
Signed-off-by: Qais Yousef <qais.yousef@arm.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Fixes: 804d402fb6f6 ("sched/rt: Make RT capacity-aware")
Link: https://lkml.kernel.org/r/20200302132721.8353-4-qais.yousef@arm.com
Diffstat (limited to 'kernel/sched/cpupri.c')
| -rw-r--r-- | kernel/sched/cpupri.c | 10 |
1 files changed, 8 insertions, 2 deletions
diff --git a/kernel/sched/cpupri.c b/kernel/sched/cpupri.c index 1bcfa1995550..dd3f16d1a04a 100644 --- a/kernel/sched/cpupri.c +++ b/kernel/sched/cpupri.c @@ -94,8 +94,14 @@ static inline int __cpupri_find(struct cpupri *cp, struct task_struct *p, return 1; } +int cpupri_find(struct cpupri *cp, struct task_struct *p, + struct cpumask *lowest_mask) +{ + return cpupri_find_fitness(cp, p, lowest_mask, NULL); +} + /** - * cpupri_find - find the best (lowest-pri) CPU in the system + * cpupri_find_fitness - find the best (lowest-pri) CPU in the system * @cp: The cpupri context * @p: The task * @lowest_mask: A mask to fill in with selected CPUs (or NULL) @@ -111,7 +117,7 @@ static inline int __cpupri_find(struct cpupri *cp, struct task_struct *p, * * Return: (int)bool - CPUs were found */ -int cpupri_find(struct cpupri *cp, struct task_struct *p, +int cpupri_find_fitness(struct cpupri *cp, struct task_struct *p, struct cpumask *lowest_mask, bool (*fitness_fn)(struct task_struct *p, int cpu)) { |