On 12.08.22 01:16, Zi Yan wrote:
> From: Zi Yan <ziy@xxxxxxxxxx>
>
> MAX_ORDER_NR_PAGES can be increased when it becomes a boot time parameter
> in later commits. To make sure read_kcore() reschedule its work in a
> constant period, use pageblock_nr_pages instead for reschedule period,
> since pageblock_nr_pages is a constant and either the same or half of
> MAX_ORDER_NR_PAGES.
>
> Signed-off-by: Zi Yan <ziy@xxxxxxxxxx>
> Cc: Mike Rapoport <rppt@xxxxxxxxxx>
> Cc: David Hildenbrand <david@xxxxxxxxxx>
> Cc: Oscar Salvador <osalvador@xxxxxxx>
> Cc: Ying Chen <chenying.kernel@xxxxxxxxxxxxx>
> Cc: Feng Zhou <zhoufeng.zf@xxxxxxxxxxxxx>
> Cc: linux-fsdevel@xxxxxxxxxxxxxxx
> Cc: linux-mm@xxxxxxxxx
> Cc: linux-kernel@xxxxxxxxxxxxxxx
> ---
> fs/proc/kcore.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/fs/proc/kcore.c b/fs/proc/kcore.c
> index dff921f7ca33..7dc09d211b48 100644
> --- a/fs/proc/kcore.c
> +++ b/fs/proc/kcore.c
> @@ -491,7 +491,7 @@ read_kcore(struct file *file, char __user *buffer, size_t buflen, loff_t *fpos)
> }
> }
>
> - if (page_offline_frozen++ % MAX_ORDER_NR_PAGES == 0) {
> + if (page_offline_frozen++ % pageblock_nr_pages == 0) {
> page_offline_thaw();
> cond_resched();
> page_offline_freeze();
Yeah, the exact number doesn't actually matter here.
Reviewed-by: David Hildenbrand <david@xxxxxxxxxx>
--
Thanks,
David / dhildenb
