[RESEND PATCH v2 0/2] Update the watchdog period according to real CPU frequency

[Yicong Yang]

On 2025/6/24 7:30, Andrew Morton wrote:
> On Thu, 19 Jun 2025 19:48:03 +0800 Yicong Yang <yangyicong at huawei.com> wrote:
> 
>> watchdog perf needs architecture to provide method for converting the watchdog
>> thresh to counter period. For arm64 we're using the max CPU frequency for
>> doing the conversion which is from cpufreq driver. But some cpufreq driver
>> are registered lately, for example cppc_cpufreq will be registered at late
>> initcall which is after the initialization of watchdog perf (initialized in
>> armv8_pmuv3 of device initcall). In such case the period of watchdog will not
>> be accurate enough. Fix this by registering a cpufreq notifier and update the
>> watchdog period once the cpufreq driver is initialized.
> 
> Great, thanks.  I'll add these to mm.git for testing.
> 

thanks.

>> arch/arm64/kernel/watchdog_hld.c | 58 ++++++++++++++++++++++++++++++++
>> include/linux/nmi.h              |  2 ++
>> kernel/watchdog_perf.c           | 23 +++++++++++++
> 
> This is not exactly my comfort zone so additional review would be
> appreciated, please.  Even though it doesn't touch drivers/cpufreq,
> perhaps the developers over there could take a look?
> .

sure. I've already cc'ed them.

thanks.