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| author |   Chengming Zhou <zhouchengming@bytedance.com> | 2022-08-26 00:41:04 +0800 |
|---|---|---|
| committer |   Peter Zijlstra <peterz@infradead.org> | 2022-09-09 11:08:31 +0200 |
| commit | e2ad8ab04c5cdfc8dc2f382c45d248ab01dee991 (patch) | |
| tree | 8584c4f3c3179254f60e1b9e12e05ac3af8ec9d3 /kernel/sched/psi.c | |
| parent | sched/psi: Don't create cgroup PSI files when psi_disabled (diff) | |
| download | linux-dev-e2ad8ab04c5cdfc8dc2f382c45d248ab01dee991.tar.xz linux-dev-e2ad8ab04c5cdfc8dc2f382c45d248ab01dee991.zip | |
sched/psi: Save percpu memory when !psi_cgroups_enabled
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
Diffstat (limited to '')
| -rw-r--r-- | kernel/sched/psi.c | 7 |
1 files changed, 4 insertions, 3 deletions
diff --git a/kernel/sched/psi.c b/kernel/sched/psi.c index 39463dcc16bb..77d53c03a76f 100644 --- a/kernel/sched/psi.c +++ b/kernel/sched/psi.c @@ -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/. |