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| author | Peter Zijlstra <peterz@infradead.org> | 2017-09-20 19:00:15 +0200 |
|---|---|---|
| committer | Thomas Gleixner <tglx@linutronix.de> | 2017-09-25 22:11:41 +0200 |
| commit | fac1c2040203363eab6c6e86ce883cb71390418f (patch) | |
| tree | 3a31e99d359b99572084ca07fffe7ce19152ab68 | |
| parent | e19b205be43d11bff638cad4487008c48d21c103 (diff) | |
| download | linux-fac1c2040203363eab6c6e86ce883cb71390418f.tar.gz linux-fac1c2040203363eab6c6e86ce883cb71390418f.tar.bz2 linux-fac1c2040203363eab6c6e86ce883cb71390418f.zip | |
smp/hotplug: Add state diagram
Add a state diagram to clarify when which states are ran where.
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: bigeasy@linutronix.de
Cc: efault@gmx.de
Cc: rostedt@goodmis.org
Cc: max.byungchul.park@gmail.com
Link: https://lkml.kernel.org/r/20170920170546.661598270@infradead.org
| -rw-r--r-- | include/linux/cpuhotplug.h | 18 |
1 files changed, 18 insertions, 0 deletions
diff --git a/include/linux/cpuhotplug.h b/include/linux/cpuhotplug.h index f24bfb2b9a2d..477b2e6f60f7 100644 --- 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, |