On Thu, Feb 09, 2023 at 12:16:54AM +0800, Kairui Song <ryncsn@xxxxxxxxx> wrote:
> Signed-off-by: Kairui Song <kasong@xxxxxxxxxxx>
> Signed-off-by: Kairui Song <ryncsn@xxxxxxxxx>
Typo?
> -static inline struct psi_group *task_psi_group(struct task_struct *task)
> +static inline struct psi_group *psi_iter_first(struct task_struct *task, void **iter)
> {
> #ifdef CONFIG_CGROUPS
> - if (static_branch_likely(&psi_cgroups_enabled))
> - return cgroup_psi(task_dfl_cgroup(task));
> + if (static_branch_likely(&psi_cgroups_enabled)) {
> + struct cgroup *cgroup = task_dfl_cgroup(task);
> +
> + *iter = cgroup_parent(cgroup);
This seems to skip a cgroup level -- maybe that's the observed
performance gain?
> + return cgroup_psi(cgroup);
> + }
> #endif
> return &psi_system;
> }
Michal
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