From: Qais Yousef qais.yousef@arm.com
[ Upstream commit 0c18f2ecfcc274a4bcc1d122f79ebd4001c3b445 ]
cpu.uclamp.min is a protection as described in cgroup-v2 Resource Distribution Model
Documentation/admin-guide/cgroup-v2.rst
which means we try our best to preserve the minimum performance point of tasks in this group. See full description of cpu.uclamp.min in the cgroup-v2.rst.
But the current implementation makes it a limit, which is not what was intended.
For example:
tg->cpu.uclamp.min = 20%
p0->uclamp[UCLAMP_MIN] = 0 p1->uclamp[UCLAMP_MIN] = 50%
Previous Behavior (limit):
p0->effective_uclamp = 0 p1->effective_uclamp = 20%
New Behavior (Protection):
p0->effective_uclamp = 20% p1->effective_uclamp = 50%
Which is inline with how protections should work.
With this change the cgroup and per-task behaviors are the same, as expected.
Additionally, we remove the confusing relationship between cgroup and !user_defined flag.
We don't want for example RT tasks that are boosted by default to max to change their boost value when they attach to a cgroup. If a cgroup wants to limit the max performance point of tasks attached to it, then cpu.uclamp.max must be set accordingly.
Or if they want to set different boost value based on cgroup, then sysctl_sched_util_clamp_min_rt_default must be used to NOT boost to max and set the right cpu.uclamp.min for each group to let the RT tasks obtain the desired boost value when attached to that group.
As it stands the dependency on !user_defined flag adds an extra layer of complexity that is not required now cpu.uclamp.min behaves properly as a protection.
The propagation model of effective cpu.uclamp.min in child cgroups as implemented by cpu_util_update_eff() is still correct. The parent protection sets an upper limit of what the child cgroups will effectively get.
Fixes: 3eac870a3247 (sched/uclamp: Use TG's clamps to restrict TASK's clamps) Signed-off-by: Qais Yousef qais.yousef@arm.com Signed-off-by: Peter Zijlstra (Intel) peterz@infradead.org Link: https://lkml.kernel.org/r/20210510145032.1934078-2-qais.yousef@arm.com Signed-off-by: Sasha Levin sashal@kernel.org --- kernel/sched/core.c | 21 +++++++++++++++++---- 1 file changed, 17 insertions(+), 4 deletions(-)
diff --git a/kernel/sched/core.c b/kernel/sched/core.c index bd3fa14fda1f..c561c3b993b5 100644 --- a/kernel/sched/core.c +++ b/kernel/sched/core.c @@ -1065,7 +1065,6 @@ uclamp_tg_restrict(struct task_struct *p, enum uclamp_id clamp_id) { struct uclamp_se uc_req = p->uclamp_req[clamp_id]; #ifdef CONFIG_UCLAMP_TASK_GROUP - struct uclamp_se uc_max;
/* * Tasks in autogroups or root task group will be @@ -1076,9 +1075,23 @@ uclamp_tg_restrict(struct task_struct *p, enum uclamp_id clamp_id) if (task_group(p) == &root_task_group) return uc_req;
- uc_max = task_group(p)->uclamp[clamp_id]; - if (uc_req.value > uc_max.value || !uc_req.user_defined) - return uc_max; + switch (clamp_id) { + case UCLAMP_MIN: { + struct uclamp_se uc_min = task_group(p)->uclamp[clamp_id]; + if (uc_req.value < uc_min.value) + return uc_min; + break; + } + case UCLAMP_MAX: { + struct uclamp_se uc_max = task_group(p)->uclamp[clamp_id]; + if (uc_req.value > uc_max.value) + return uc_max; + break; + } + default: + WARN_ON_ONCE(1); + break; + } #endif
return uc_req;