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Subject[PATCH 7/7] migrate_pages(): fix failure counting for retry
Date
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")
Cc: Baolin Wang <baolin.wang@linux.alibaba.com>
Cc: Zi Yan <ziy@nvidia.com>
Cc: Yang Shi <shy828301@gmail.com>
---
mm/migrate.c | 5 +++++
1 file changed, 5 insertions(+)

diff --git a/mm/migrate.c b/mm/migrate.c
index 70a0e1f34c03..e42bd409d3aa 100644
--- a/mm/migrate.c
+++ b/mm/migrate.c
@@ -1344,6 +1344,7 @@ 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;
@@ -1364,6 +1365,7 @@ 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) {
/*
@@ -1449,12 +1451,14 @@ int migrate_pages(struct list_head *from, new_page_t get_new_page,
nr_thp_failed += thp_retry;
if (!no_subpage_counting)
nr_failed += retry;
+ nr_failed_pages += nr_retry_pages;
goto out;
case -EAGAIN:
if (is_thp)
thp_retry++;
else
retry++;
+ nr_retry_pages += nr_subpages;
break;
case MIGRATEPAGE_SUCCESS:
nr_succeeded += nr_subpages;
@@ -1481,6 +1485,7 @@ 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
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