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 [thread overview]
Message-ID: <20170920170546.661598270@infradead.org> (raw)
In-Reply-To: 20170920170014.548896195@infradead.org
[-- Attachment #1: 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,
next prev parent reply other threads:[~2017-09-20 17:07 UTC|newest]
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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