linux-kernel - [PATCH v2] PM: tools: add "CPU killed" messages to fix an error in suspend flow

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Date:   Thu, 16 Mar 2023 09:33:07 +0800
From:   Xueqin Luo <luoxueqin@...inos.cn>
To:     rafael@...nel.org, todd.e.brandt@...ux.intel.com,
        linux-pm@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     luoxueqin@...inos.cn, xiongxin@...inos.cn
Subject: [PATCH v2] PM: tools: add "CPU killed" messages to fix an error in suspend flow

On the arm64 platform, the core log of cpu offline is as follows:

[  100.431501] CPU1: shutdown
[  100.454820] psci: CPU1 killed (polled 20 ms)
[  100.459266] CPU2: shutdown
[  100.482575] psci: CPU2 killed (polled 20 ms)
[  100.486057] CPU3: shutdown
[  100.513974] psci: CPU3 killed (polled 28 ms)
[  100.518068] CPU4: shutdown
[  100.541481] psci: CPU4 killed (polled 24 ms)

And this goal of this patch is to prevent sleepgraph from mistakenly
treating the "CPU up" message as part of the suspend flow (because it
should be regarded as part of the resume flow).

Signed-off-by: Xueqin Luo <luoxueqin@...inos.cn>
---

v2: update changelog

 tools/power/pm-graph/sleepgraph.py | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/tools/power/pm-graph/sleepgraph.py b/tools/power/pm-graph/sleepgraph.py
index 82c09cd25cc2..d816970b0a3d 100755
--- a/tools/power/pm-graph/sleepgraph.py
+++ b/tools/power/pm-graph/sleepgraph.py
@@ -4132,9 +4132,12 @@ def parseKernelLog(data):
 			elif(re.match('Enabling non-boot CPUs .*', msg)):
 				# start of first cpu resume
 				cpu_start = ktime
-			elif(re.match('smpboot: CPU (?P<cpu>[0-9]*) is now offline', msg)):
+			elif(re.match('smpboot: CPU (?P<cpu>[0-9]*) is now offline', msg)) \
+				or re.match('psci: CPU(?P<cpu>[0-9]*) killed.*', msg)):
 				# end of a cpu suspend, start of the next
 				m = re.match('smpboot: CPU (?P<cpu>[0-9]*) is now offline', msg)
+				if(not m):
+					m = re.match('psci: CPU(?P<cpu>[0-9]*) killed.*', msg)
 				cpu = 'CPU'+m.group('cpu')
 				if(cpu not in actions):
 					actions[cpu] = []
-- 
2.25.1