[PATCH v4 0/3] promote mapped executable folios after first usage for MGLRU

[Baolin Wang <baolin.wang@linux.alibaba.com>]

Now MGLRU's protection of mapped executable file folios is less reliable.
Follow the classical LRU's logic, promoting mapped executable file folios
after their first usage to give executable code a better chance to stay in
memory and improve workload performance (See patch 2 for more details).

Changes from v3:
https://lore.kernel.org/all/cover.1784268206.git.baolin.wang@linux.alibaba.com/
 - Collect tags from Johannes, Axel, Barry and Kairui. Thanks.
 - Split the helper addition out into a separate patch (per Johannes).
 - Set PG_workingset before promoting in lru_gen_set_refs() (per Kairui).
 - Some code cleanups (per Kairui).

Changes from v2:
https://lore.kernel.org/all/cover.1784197559.git.baolin.wang@linux.alibaba.com/
 - Add acked tag from David. Thanks.
 - Rename the exec-file-folio helper and move it into vmscan.c (per David).

Changes from v1:
https://lore.kernel.org/all/4b921ed528c483e13c9e22d1ae44ba58b4a15b0b.1784096432.git.baolin.wang@linux.alibaba.com/
 - Add a new patch to clean up vma flags as preparation.
 - Add a new helper to check exec file folios (per Kaisui).
 - Promote exec file folios in lru_gen_set_refs (Per Sashiko).

Baolin Wang (3):
  mm: vmscan: convert folio_referenced() to use vma_flags_t
  mm: vmscan: add a helper to identify file-backed executable folios
  mm: mglru: promote mapped executable folios after first usage

 include/linux/rmap.h |  7 +++--
 mm/rmap.c            | 19 +++++++------
 mm/vmscan.c          | 63 ++++++++++++++++++++++++++++----------------
 3 files changed, 54 insertions(+), 35 deletions(-)

-- 
2.47.3