Re: [PATCH v3 5/6] selftests: prctl: introduce tests for disabling THPs completely

[Usama Arif <usamaarif642@gmail.com>]

On 05/08/2025 13:39, David Hildenbrand wrote:
>> +FIXTURE_SETUP(prctl_thp_disable_completely)
>> +{
>> +    if (!thp_available())
>> +        SKIP(return, "Transparent Hugepages not available\n");
>> +
>> +    self->pmdsize = read_pmd_pagesize();
>> +    if (!self->pmdsize)
>> +        SKIP(return, "Unable to read PMD size\n");
>> +
>> +    thp_save_settings();
>> +    thp_read_settings(&self->settings);
>> +    self->settings.thp_enabled = variant->thp_policy;
>> +    self->settings.hugepages[sz2ord(self->pmdsize, getpagesize())].enabled = THP_INHERIT;
> 
> Oh, one more thing: should we set all other sizes also to THP_INHERIT or (for simplicity) THP_NEVER?
> 

hmm do we need to? I am hoping that we should always get the PMD size THP no matter what the policy
for others is in the scenario we have?