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sched/psi: Save percpu memory when !psi_cgroups_enabled

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We won't use cgroup psi_group when !psi_cgroups_enabled, so don't
bother to alloc percpu memory and init for it.

Also don't need to migrate task PSI stats between cgroups in
cgroup_move_task().

Signed-off-by: Chengming Zhou <zhouchengming@bytedance.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Acked-by: Johannes Weiner <hannes@cmpxchg.org>
Link: https://lore.kernel.org/r/20220825164111.29534-4-zhouchengming@bytedance.com
This commit is contained in:
Chengming Zhou 2022-08-26 00:41:04 +08:00 committed by Peter Zijlstra
parent 58d8c2586c
commit e2ad8ab04c
1 changed files with 4 additions and 3 deletions
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7
kernel/sched/psi.c
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@ -201,6 +201,7 @@ void __init psi_init(void)
{
if (!psi_enable) {
static_branch_enable(&psi_disabled);
static_branch_disable(&psi_cgroups_enabled);
return;
}
@ -950,7 +951,7 @@ void psi_memstall_leave(unsigned long *flags)
#ifdef CONFIG_CGROUPS
int psi_cgroup_alloc(struct cgroup *cgroup)
{
if (static_branch_likely(&psi_disabled))
if (!static_branch_likely(&psi_cgroups_enabled))
return 0;
cgroup->psi = kzalloc(sizeof(struct psi_group), GFP_KERNEL);
@ -968,7 +969,7 @@ int psi_cgroup_alloc(struct cgroup *cgroup)
void psi_cgroup_free(struct cgroup *cgroup)
{
if (static_branch_likely(&psi_disabled))
if (!static_branch_likely(&psi_cgroups_enabled))
return;
cancel_delayed_work_sync(&cgroup->psi->avgs_work);
@ -996,7 +997,7 @@ void cgroup_move_task(struct task_struct *task, struct css_set *to)
struct rq_flags rf;
struct rq *rq;
if (static_branch_likely(&psi_disabled)) {
if (!static_branch_likely(&psi_cgroups_enabled)) {
/*
* Lame to do this here, but the scheduler cannot be locked
* from the outside, so we move cgroups from inside sched/.