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sched: Introduce CONFIG_GROUP_SCHED_WEIGHT

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sched_ext will soon add cgroup cpu.weigh support. The cgroup interface code
is currently gated behind CONFIG_FAIR_GROUP_SCHED. As the fair class and/or
SCX may implement the feature, put the interface code behind the new
CONFIG_CGROUP_SCHED_WEIGHT which is selected by CONFIG_FAIR_GROUP_SCHED.
This allows either sched class to enable the itnerface code without ading
more complex CONFIG tests.

When !CONFIG_FAIR_GROUP_SCHED, a dummy version of sched_group_set_shares()
is added to support later CONFIG_CGROUP_SCHED_WEIGHT &&
!CONFIG_FAIR_GROUP_SCHED builds.

No functional changes.

Signed-off-by: Tejun Heo <tj@kernel.org>
This commit is contained in:
Tejun Heo 2024-09-04 10:24:59 -10:00
parent 41082c1d1d
commit e179e80c5d
3 changed files with 14 additions and 8 deletions
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4
init/Kconfig
View File

@ -1024,9 +1024,13 @@ menuconfig CGROUP_SCHED
tasks.
if CGROUP_SCHED
config GROUP_SCHED_WEIGHT
def_bool n
config FAIR_GROUP_SCHED
bool "Group scheduling for SCHED_OTHER"
depends on CGROUP_SCHED
select GROUP_SCHED_WEIGHT
default CGROUP_SCHED
config CFS_BANDWIDTH

14
kernel/sched/core.c
View File

@ -9193,7 +9193,7 @@ static int cpu_uclamp_max_show(struct seq_file *sf, void *v)
}
#endif /* CONFIG_UCLAMP_TASK_GROUP */
#ifdef CONFIG_FAIR_GROUP_SCHED
#ifdef CONFIG_GROUP_SCHED_WEIGHT
static unsigned long tg_weight(struct task_group *tg)
{
return scale_load_down(tg->shares);
@ -9212,6 +9212,7 @@ static u64 cpu_shares_read_u64(struct cgroup_subsys_state *css,
{
return tg_weight(css_tg(css));
}
#endif /* CONFIG_GROUP_SCHED_WEIGHT */
#ifdef CONFIG_CFS_BANDWIDTH
static DEFINE_MUTEX(cfs_constraints_mutex);
@ -9557,7 +9558,6 @@ static int cpu_cfs_local_stat_show(struct seq_file *sf, void *v)
return 0;
}
#endif /* CONFIG_CFS_BANDWIDTH */
#endif /* CONFIG_FAIR_GROUP_SCHED */
#ifdef CONFIG_RT_GROUP_SCHED
static int cpu_rt_runtime_write(struct cgroup_subsys_state *css,
@ -9585,7 +9585,7 @@ static u64 cpu_rt_period_read_uint(struct cgroup_subsys_state *css,
}
#endif /* CONFIG_RT_GROUP_SCHED */
#ifdef CONFIG_FAIR_GROUP_SCHED
#ifdef CONFIG_GROUP_SCHED_WEIGHT
static s64 cpu_idle_read_s64(struct cgroup_subsys_state *css,
struct cftype *cft)
{
@ -9600,7 +9600,7 @@ static int cpu_idle_write_s64(struct cgroup_subsys_state *css,
#endif
static struct cftype cpu_legacy_files[] = {
#ifdef CONFIG_FAIR_GROUP_SCHED
#ifdef CONFIG_GROUP_SCHED_WEIGHT
{
.name = "shares",
.read_u64 = cpu_shares_read_u64,
@ -9710,7 +9710,7 @@ static int cpu_local_stat_show(struct seq_file *sf,
return 0;
}
#ifdef CONFIG_FAIR_GROUP_SCHED
#ifdef CONFIG_GROUP_SCHED_WEIGHT
static u64 cpu_weight_read_u64(struct cgroup_subsys_state *css,
struct cftype *cft)
@ -9764,7 +9764,7 @@ static int cpu_weight_nice_write_s64(struct cgroup_subsys_state *css,
return sched_group_set_shares(css_tg(css), scale_load(weight));
}
#endif
#endif /* CONFIG_GROUP_SCHED_WEIGHT */
static void __maybe_unused cpu_period_quota_print(struct seq_file *sf,
long period, long quota)
@ -9824,7 +9824,7 @@ static ssize_t cpu_max_write(struct kernfs_open_file *of,
#endif
static struct cftype cpu_files[] = {
#ifdef CONFIG_FAIR_GROUP_SCHED
#ifdef CONFIG_GROUP_SCHED_WEIGHT
{
.name = "weight",
.flags = CFTYPE_NOT_ON_ROOT,

4
kernel/sched/sched.h
View File

@ -483,7 +483,7 @@ struct task_group {
};
#ifdef CONFIG_FAIR_GROUP_SCHED
#ifdef CONFIG_GROUP_SCHED_WEIGHT
#define ROOT_TASK_GROUP_LOAD NICE_0_LOAD
/*
@ -575,6 +575,8 @@ extern void set_task_rq_fair(struct sched_entity *se,
static inline void set_task_rq_fair(struct sched_entity *se,
struct cfs_rq *prev, struct cfs_rq *next) { }
#endif /* CONFIG_SMP */
#else /* !CONFIG_FAIR_GROUP_SCHED */
static inline int sched_group_set_shares(struct task_group *tg, unsigned long shares) { return 0; }
#endif /* CONFIG_FAIR_GROUP_SCHED */
#else /* CONFIG_CGROUP_SCHED */