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| author |   Chengming Zhou <zhouchengming@bytedance.com> | 2022-08-26 00:41:08 +0800 |
|---|---|---|
| committer |   Peter Zijlstra <peterz@infradead.org> | 2022-09-09 11:08:32 +0200 |
| commit | 52b1364ba0b105122d6de0e719b36db705011ac1 (patch) | |
| tree | a6601f432fbe2c006addc068eab9b98febf0449c /Documentation/admin-guide/cgroup-v2.rst | |
| parent | sched/psi: Remove NR_ONCPU task accounting (diff) | |
| download | wireguard-linux-52b1364ba0b105122d6de0e719b36db705011ac1.tar.xz wireguard-linux-52b1364ba0b105122d6de0e719b36db705011ac1.zip | |
sched/psi: Add PSI_IRQ to track IRQ/SOFTIRQ pressure
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
Diffstat (limited to 'Documentation/admin-guide/cgroup-v2.rst')
| -rw-r--r-- | Documentation/admin-guide/cgroup-v2.rst | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/Documentation/admin-guide/cgroup-v2.rst b/Documentation/admin-guide/cgroup-v2.rst index be4a77baf784..971c418bc778 100644 --- a/Documentation/admin-guide/cgroup-v2.rst +++ b/Documentation/admin-guide/cgroup-v2.rst @@ -976,6 +976,12 @@ All cgroup core files are prefixed with "cgroup." killing cgroups is a process directed operation, i.e. it affects the whole thread-group. + irq.pressure + A read-write nested-keyed file. + + Shows pressure stall information for IRQ/SOFTIRQ. See + :ref:`Documentation/accounting/psi.rst <psi>` for details. + Controllers =========== |