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psi: Add PSI_CPU_FULL state 

The FULL state doesn't exist for the CPU resource at the system level,
but exist at the cgroup level, means all non-idle tasks in a cgroup are
delayed on the CPU resource which used by others outside of the cgroup
or throttled by the cgroup cpu.max configuration.

Co-developed-by: Muchun Song <songmuchun@bytedance.com>
Signed-off-by: Muchun Song <songmuchun@bytedance.com>
Signed-off-by: Chengming Zhou <zhouchengming@bytedance.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Acked-by: Johannes Weiner <hannes@cmpxchg.org>
Link: https://lkml.kernel.org/r/20210303034659.91735-2-zhouchengming@bytedance.com
This commit is contained in:
Chengming Zhou 2021-03-03 11:46:56 +08:00 committed by Ingo Molnar
parent 585b6d2723
commit e7fcd76228
2 changed files with 13 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
include/linux/psi_types.h
View File

@ -50,9 +50,10 @@ enum psi_states {
PSI_MEM_SOME,
PSI_MEM_FULL,
PSI_CPU_SOME,
PSI_CPU_FULL,
/* Only per-CPU, to weigh the CPU in the global average: */
PSI_NONIDLE,
NR_PSI_STATES = 6,
NR_PSI_STATES = 7,
};
enum psi_aggregators {

14
kernel/sched/psi.c
View File

@ -34,7 +34,10 @@
* delayed on that resource such that nobody is advancing and the CPU
* goes idle. This leaves both workload and CPU unproductive.
*
* (Naturally, the FULL state doesn't exist for the CPU resource.)
* Naturally, the FULL state doesn't exist for the CPU resource at the
* system level, but exist at the cgroup level, means all non-idle tasks
* in a cgroup are delayed on the CPU resource which used by others outside
* of the cgroup or throttled by the cgroup cpu.max configuration.
*
* SOME = nr_delayed_tasks != 0
* FULL = nr_delayed_tasks != 0 && nr_running_tasks == 0
@ -225,6 +228,8 @@ static bool test_state(unsigned int *tasks, enum psi_states state)
return tasks[NR_MEMSTALL] && !tasks[NR_RUNNING];
case PSI_CPU_SOME:
return tasks[NR_RUNNING] > tasks[NR_ONCPU];
case PSI_CPU_FULL:
return tasks[NR_RUNNING] && !tasks[NR_ONCPU];
case PSI_NONIDLE:
return tasks[NR_IOWAIT] || tasks[NR_MEMSTALL] ||
tasks[NR_RUNNING];
@ -678,8 +683,11 @@ static void record_times(struct psi_group_cpu *groupc, int cpu,
}
}
if (groupc->state_mask & (1 << PSI_CPU_SOME))
if (groupc->state_mask & (1 << PSI_CPU_SOME)) {
groupc->times[PSI_CPU_SOME] += delta;
if (groupc->state_mask & (1 << PSI_CPU_FULL))
groupc->times[PSI_CPU_FULL] += delta;
}
if (groupc->state_mask & (1 << PSI_NONIDLE))
groupc->times[PSI_NONIDLE] += delta;
@ -1018,7 +1026,7 @@ int psi_show(struct seq_file *m, struct psi_group *group, enum psi_res res)
group->avg_next_update = update_averages(group, now);
mutex_unlock(&group->avgs_lock);
for (full = 0; full < 2 - (res == PSI_CPU); full++) {
for (full = 0; full < 2; full++) {
unsigned long avg[3];
u64 total;
int w;