Re: [PATCH -V2 7/7] migrate_pages(): fix failure counting for retry

Oscar Salvador
2022-07-11T12:52:39Z

On Mon, Jul 11, 2022 at 04:49:48PM +0800, Huang Ying wrote:
> After 10 retries, we will give up and the remaining pages will be
> counted as failure in nr_failed and nr_thp_failed. We should count
> the failure in nr_failed_pages too. This is done in this patch.
>
> Signed-off-by: "Huang, Ying" <ying.huang@intel.com>
> Fixes: 5984fabb6e82 ("mm: move_pages: report the number of non-attempted pages")
> Reviewed-by: Baolin Wang <baolin.wang@linux.alibaba.com>
> Cc: Zi Yan <ziy@nvidia.com>
> Cc: Yang Shi <shy828301@gmail.com>

Reviewed-by: Oscar Salvador <osalvador@suse.de>

> ---
> mm/migrate.c | 6 +++++-
> 1 file changed, 5 insertions(+), 1 deletion(-)
>
> diff --git a/mm/migrate.c b/mm/migrate.c
> index 557708ce13a1..cee6fc5a2d31 100644
> --- a/mm/migrate.c
> +++ b/mm/migrate.c
> @@ -1345,6 +1345,7 @@ int migrate_pages(struct list_head *from, new_page_t get_new_page,
> int thp_retry = 1;
> int nr_failed = 0;
> int nr_failed_pages = 0;
> + int nr_retry_pages = 0;
> int nr_succeeded = 0;
> int nr_thp_succeeded = 0;
> int nr_thp_failed = 0;
> @@ -1365,6 +1366,7 @@ int migrate_pages(struct list_head *from, new_page_t get_new_page,
> for (pass = 0; pass < 10 && (retry || thp_retry); pass++) {
> retry = 0;
> thp_retry = 0;
> + nr_retry_pages = 0;
>
> list_for_each_entry_safe(page, page2, from, lru) {
> /*
> @@ -1439,7 +1441,7 @@ int migrate_pages(struct list_head *from, new_page_t get_new_page,
> nr_failed++;
> }
>
> - nr_failed_pages += nr_subpages;
> + nr_failed_pages += nr_subpages + nr_retry_pages;
> /*
> * There might be some subpages of fail-to-migrate THPs
> * left in thp_split_pages list. Move them back to migration
> @@ -1455,6 +1457,7 @@ int migrate_pages(struct list_head *from, new_page_t get_new_page,
> thp_retry++;
> else
> retry++;
> + nr_retry_pages += nr_subpages;
> break;
> case MIGRATEPAGE_SUCCESS:
> nr_succeeded += nr_subpages;
> @@ -1481,6 +1484,7 @@ int migrate_pages(struct list_head *from, new_page_t get_new_page,
> if (!no_subpage_counting)
> nr_failed += retry;
> nr_thp_failed += thp_retry;
> + nr_failed_pages += nr_retry_pages;
> /*
> * Try to migrate subpages of fail-to-migrate THPs, no nr_failed
> * counting in this round, since all subpages of a THP is counted
> --
> 2.30.2
>
>

--
Oscar Salvador
SUSE Labs