[PATCH 0/3] Improve the migration stats

[Baolin Wang]

Hi,

According to talk with Zi Yan [1], this patch set changes the return
value of migrate_pages() to avoid returning a number which is larger
than the number of pages the users tried to migrate by move_pages() syscall.
Also fix the hugetlb migration stats and migration stats in
trace_mm_compaction_migratepages(). Please help to review. Thanks.

[1] https://lore.kernel.org/linux-mm/7E44019D-2A5D-4BA7-B4D5-00D4712F1687@xxxxxxxxxx/

Changes from RFC:
 - Increase nr_thp_failed when THP is split, no matter how many subpages are
 migrated successfully.
 - Add reviewed-by tags.

Baolin Wang (3):
  mm: migrate: Fix the return value of migrate_pages()
  mm: migrate: Correct the hugetlb migration stats
  mm: compaction: Fix the migration stats in
    trace_mm_compaction_migratepages()

 include/trace/events/compaction.h | 24 +++-----------
 mm/compaction.c                   |  7 ++--
 mm/migrate.c                      | 68 ++++++++++++++++++++++++++++-----------
 3 files changed, 57 insertions(+), 42 deletions(-)

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1.8.3.1