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The cgroup-v2 documentation describes memory.pressure and io.pressure as "read-only nested-keyed file", but both files accept trigger writes (cgroup_memory_pressure_write / cgroup_io_pressure_write) and are therefore read-write. cpu.pressure and irq.pressure are already documented as read-write, so this also resolves an internal inconsistency. Signed-off-by: Tao Cui <cuitao@kylinos.cn> Signed-off-by: Tejun Heo <tj@kernel.org>