Re: [PATCH v17 08/10] PM: hibernate: disable when there are active secretmem users

Michal Hocko
2021-02-08T12:33:43Z

On Mon 08-02-21 12:26:31, David Hildenbrand wrote:
[...]
> My F33 system happily hibernates to disk, even with an application that
> succeeded in din doing an mlockall().
>
> And it somewhat makes sense. Even my freshly-booted, idle F33 has
>
> $ cat /proc/meminfo | grep lock
> Mlocked: 4860 kB
>
> So, stopping to hibernate with mlocked memory would essentially prohibit any
> modern Linux distro to hibernate ever.

My system seems to be completely fine without mlocked memory. It would
be interesting to see who mlocks memory on your system and check whether
the expectated mlock semantic really works for those. This should be
documented at least.
--
Michal Hocko
SUSE Labs