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sched/uclamp: Make uclamp util helpers use and return UL values 

Vincent pointed out recently that the canonical type for utilization
values is 'unsigned long'. Internally uclamp uses 'unsigned int' values for
cache optimization, but this doesn't have to be exported to its users.

Make the uclamp helpers that deal with utilization use and return unsigned
long values.

Tested-By: Dietmar Eggemann <dietmar.eggemann@arm.com>
Signed-off-by: Valentin Schneider <valentin.schneider@arm.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Quentin Perret <qperret@google.com>
Reviewed-by: Vincent Guittot <vincent.guittot@linaro.org>
Reviewed-by: Dietmar Eggemann <dietmar.eggemann@arm.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: https://lkml.kernel.org/r/20191211113851.24241-3-valentin.schneider@arm.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Valentin Schneider 2019-12-11 11:38:48 +00:00 committed by Ingo Molnar
parent 59fe675248
commit 686516b55e
2 changed files with 10 additions and 10 deletions
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6
kernel/sched/core.c
View File

@ -919,17 +919,17 @@ uclamp_eff_get(struct task_struct *p, enum uclamp_id clamp_id)
return uc_req;
}
unsigned int uclamp_eff_value(struct task_struct *p, enum uclamp_id clamp_id)
unsigned long uclamp_eff_value(struct task_struct *p, enum uclamp_id clamp_id)
{
struct uclamp_se uc_eff;
/* Task currently refcounted: use back-annotated (effective) value */
if (p->uclamp[clamp_id].active)
return p->uclamp[clamp_id].value;
return (unsigned long)p->uclamp[clamp_id].value;
uc_eff = uclamp_eff_get(p, clamp_id);
return uc_eff.value;
return (unsigned long)uc_eff.value;
}
/*

14
kernel/sched/sched.h
View File

@ -2300,14 +2300,14 @@ static inline void cpufreq_update_util(struct rq *rq, unsigned int flags) {}
#endif /* CONFIG_CPU_FREQ */
#ifdef CONFIG_UCLAMP_TASK
unsigned int uclamp_eff_value(struct task_struct *p, enum uclamp_id clamp_id);
unsigned long uclamp_eff_value(struct task_struct *p, enum uclamp_id clamp_id);
static __always_inline
unsigned int uclamp_util_with(struct rq *rq, unsigned int util,
struct task_struct *p)
unsigned long uclamp_util_with(struct rq *rq, unsigned long util,
struct task_struct *p)
{
unsigned int min_util = READ_ONCE(rq->uclamp[UCLAMP_MIN].value);
unsigned int max_util = READ_ONCE(rq->uclamp[UCLAMP_MAX].value);
unsigned long min_util = READ_ONCE(rq->uclamp[UCLAMP_MIN].value);
unsigned long max_util = READ_ONCE(rq->uclamp[UCLAMP_MAX].value);
if (p) {
min_util = max(min_util, uclamp_eff_value(p, UCLAMP_MIN));
@ -2325,8 +2325,8 @@ unsigned int uclamp_util_with(struct rq *rq, unsigned int util,
return clamp(util, min_util, max_util);
}
#else /* CONFIG_UCLAMP_TASK */
static inline unsigned int uclamp_util_with(struct rq *rq, unsigned int util,
struct task_struct *p)
static inline unsigned long uclamp_util_with(struct rq *rq, unsigned long util,
struct task_struct *p)
{
return util;
}