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From: Peter Zijlstra <peterz@infradead.org>
To: mingo@kernel.org, tglx@linutronix.de
Cc: linux-kernel@vger.kernel.org, peterz@infradead.org,
	rostedt@goodmis.org, bigeasy@linutronix.de, efault@gmx.de,
	max.byungchul.park@gmail.com
Subject: [PATCH 1/7] smp/hotplug: Add state diagram
Date: Wed, 20 Sep 2017 19:00:15 +0200
Message-ID: <20170920170546.661598270@infradead.org> (raw)
In-Reply-To: <20170920170014.548896195@infradead.org>


[-- Attachment #0: peterz-hotplug-1.patch --]
[-- Type: text/plain, Size: 793 bytes --]

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,

  reply index

Thread overview: 12+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2017-09-20 17:00 [PATCH 0/7] smp/hotplug rework / lockdep annotate Peter Zijlstra
2017-09-20 17:00 ` Peter Zijlstra [this message]
2017-09-20 17:00 ` [PATCH 2/7] smp/hotplug: Allow external multi-instance rollback Peter Zijlstra
2017-09-20 17:00 ` [PATCH 3/7] smp/hotplug: Rewrite AP state machine core Peter Zijlstra
2017-09-20 17:00 ` [PATCH 4/7] smp/hotplug: Callback vs state-machine consistency Peter Zijlstra
2017-09-20 17:00 ` [PATCH 5/7] smp/hotplug: Differentiate the AP completion between up and down Peter Zijlstra
2017-09-25  8:49   ` Byungchul Park
2017-09-20 17:00 ` [PATCH 6/7] smp/hotplug: Differentiate the AP-work lockdep class " Peter Zijlstra
2017-09-25  8:54   ` Byungchul Park
2017-09-25  9:16     ` Peter Zijlstra
2017-11-30 14:43   ` Lai Jiangshan
2017-09-20 17:00 ` [PATCH 7/7] smp/hotplug: Hotplug state fail injection Peter Zijlstra

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