linux-kernel - Re: [PATCH v3] softlockup: serialized softlockup's log

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Message-ID: <CAD=FV=Ux09EUZwpW3tYFEYG=LfYDibmHrgczF03_EszLykagUQ@mail.gmail.com>
Date:   Mon, 27 Nov 2023 13:47:58 -0800
From:   Doug Anderson <dianders@...omium.org>
To:     lizhe.67@...edance.com
Cc:     akpm@...ux-foundation.org, pmladek@...e.com,
        lecopzer.chen@...iatek.com, kernelfans@...il.com,
        linux-kernel@...r.kernel.org, lizefan.x@...edance.com
Subject: Re: [PATCH v3] softlockup: serialized softlockup's log

Hi,

On Thu, Nov 23, 2023 at 12:41 AM <lizhe.67@...edance.com> wrote:
>
> From: Li Zhe <lizhe.67@...edance.com>
>
> If multiple CPUs trigger softlockup at the same time with
> 'softlockup_all_cpu_backtrace=0', the softlockup's logs will appear
> staggeredly in dmesg, which will affect the viewing of the logs for
> developer. Since the code path for outputting softlockup logs is not
> a kernel hotspot and the performance requirements for the code are
> not strict, locks are used to serialize the softlockup log output to
> improve the readability of the logs.
>
> Signed-off-by: Li Zhe <lizhe.67@...edance.com>
> ---
> Changelogs:
>
> v1->v2:
> - define the lock outside the scope of function
> - add precondition 'softlockup_all_cpu_backtrace=0' in commit message
>
> v2->v3:
> - define the lock inside the scope of function
>
>  kernel/watchdog.c | 3 +++
>  1 file changed, 3 insertions(+)

Reviewed-by: Douglas Anderson <dianders@...omium.org>