linux-kernel - Re: [PATCH -next] PM: tools: add "CPU killed" timeline on arm64 platform

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Date:   Thu, 23 Feb 2023 19:11:52 +0100
From:   "Rafael J. Wysocki" <rafael@...nel.org>
To:     Xueqin Luo <luoxueqin@...inos.cn>, todd.e.brandt@...ux.intel.com
Cc:     linux-pm@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH -next] PM: tools: add "CPU killed" timeline on arm64 platform

On Thu, Feb 23, 2023 at 5:46 AM Xueqin Luo <luoxueqin@...inos.cn> wrote:
>
> On the arm64 platform, the core log of cpu offline is as follows:

Please spell CPU in capitals.

> [  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)
>
> 'smpboot: CPU (?P<cpu>[0-9]*) is now offline' cannot be applied
> to the arm64 platform, which caused the loss of the suspend
> machine stage in S3.

I'm not exactly sure what you mean by "loss of the suspend machine stage in S3".

>  Here I added core code to fix this issue.
>
> Signed-off-by: Xueqin Luo <luoxueqin@...inos.cn>
> ---
>  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] = []
> --

The changes look reasonable to me, though.

Todd, any comments?