On Thu, Aug 26, 2021 at 03:17:42PM +0800, Liu Zixian wrote:
> After fork, the child process will get incorrect (2x) hugetlb_usage.
> If a process uses 5 2MB hugetlb pages in an anonymous mapping,
> HugetlbPages: 10240 kB
> and then forks, the child will show,
> HugetlbPages: 20480 kB
> The reason for double the amount is because hugetlb_usage will be
> copied from the parent and then increased when we copy page tables
> from parent to child. Child will have 2x actual usage.
>
> Fix this by adding hugetlb_count_init in mm_init.
>
> Fixes: 5d317b2b6536 ("mm: hugetlb: proc: add HugetlbPages field to
> /proc/PID/status")
> Signed-off-by: Liu Zixian <liuzixian4@xxxxxxxxxx>
Thank you for the fix.
Reviewed-by: Naoya Horiguchi <naoya.horiguchi@xxxxxxx>
