sched/psi: Add PSI_IRQ to track IRQ/SOFTIRQ pressure

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Now PSI already tracked workload pressure stall information for
CPU, memory and IO. Apart from these, IRQ/SOFTIRQ could have
obvious impact on some workload productivity, such as web service
workload.

When CONFIG_IRQ_TIME_ACCOUNTING, we can get IRQ/SOFTIRQ delta time
from update_rq_clock_task(), in which we can record that delta
to CPU curr task's cgroups as PSI_IRQ_FULL status.

Note we don't use PSI_IRQ_SOME since IRQ/SOFTIRQ always happen in
the current task on the CPU, make nothing productive could run
even if it were runnable, so we only use PSI_IRQ_FULL.

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/20220825164111.29534-8-zhouchengming@bytedance.com

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This commit is contained in:

Chengming Zhou 2022-08-26 00:41:08 +08:00 • committed by Peter Zijlstra

parent 71dbdde791

commit 52b1364ba0

6 changed files with 116 additions and 4 deletions

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6

Documentation/admin-guide/cgroup-v2.rst

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10

include/linux/psi_types.h

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27

kernel/cgroup/cgroup.c

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1

kernel/sched/core.c

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74

kernel/sched/psi.c

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2

kernel/sched/stats.h

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