Messages in this thread Patch in this message | | | Date | Wed, 20 Sep 2017 19:00:15 +0200 | From | Peter Zijlstra <> | Subject | [PATCH 1/7] smp/hotplug: Add state diagram |
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Add a state diagram to clarify when which states are ran where.
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> --- include/linux/cpuhotplug.h | 18 ++++++++++++++++++ 1 file changed, 18 insertions(+)
--- a/include/linux/cpuhotplug.h +++ b/include/linux/cpuhotplug.h @@ -3,6 +3,24 @@ #include <linux/types.h> +/* + * CPU-up CPU-down + * + * BP AP BP AP + * + * OFFLINE OFFLINE + * | ^ + * v | + * BRINGUP_CPU->AP_OFFLINE BRINGUP_CPU <- AP_IDLE_DEAD (idle thread/play_dead) + * | AP_OFFLINE + * v (IRQ-off) ,---------------^ + * AP_ONLNE | (stop_machine) + * | TEARDOWN_CPU <- AP_ONLINE_IDLE + * | ^ + * v | + * AP_ACTIVE AP_ACTIVE + */ + enum cpuhp_state { CPUHP_OFFLINE, CPUHP_CREATE_THREADS,
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