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

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Message-ID: <CAJZ5v0jUHtt9_px6tNfv77nAMYE=pd67r9sAV=+RwVZFyqwC=w@mail.gmail.com>
Date:   Mon, 27 Mar 2023 19:25:30 +0200
From:   "Rafael J. Wysocki" <rafael@...nel.org>
To:     Xueqin Luo <luoxueqin@...inos.cn>
Cc:     rafael@...nel.org, todd.e.brandt@...ux.intel.com,
        linux-pm@...r.kernel.org, linux-kernel@...r.kernel.org,
        xiongxin@...inos.cn
Subject: Re: [PATCH v2] PM: tools: add "CPU killed" messages to fix an error
 in suspend flow

On Thu, Mar 16, 2023 at 2:33 AM Xueqin Luo <luoxueqin@...inos.cn> wrote:
>
> 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] = []
> --

Applied as 6.4 material with some edits in the subject and changelog.

Thanks!