[PATCH v2 0/3] trim the uses of compound_head()

[Yu Zhao]

Patch series "mm: lru related cleanups" starting at commit 42895ea73bcd
("mm/vmscan.c: use add_page_to_lru_list()") bloated vmlinux by 1777
bytes, according to:
  https://lore.kernel.org/linux-mm/85b3e8f2-5982-3329-c20d-cf062b8da71e@xxxxxxx/

It turned out many places inline Page{Active,Unevictable} which in
turn include compound_head().

>From the v1:
  Removing compound_head() entirely from Page{Active,Unevictable} may
  not be the best option (for the moment) because there may be other
  cases that need compound_head().

In addition to picking a couple pieces of low-hanging fruit, this v2
removes compound_head() completely from Page{Active,Unevictable}.

bloat-o-meter result before and after the series:
  add/remove: 0/0 grow/shrink: 6/92 up/down: 697/-7656 (-6959)

Yu Zhao (3):
  mm: bypass compound_head() for PF_NO_TAIL when enforce=1
  mm: use PF_NO_TAIL for PG_lru
  mm: use PF_ONLY_HEAD for PG_active and PG_unevictable

 fs/proc/task_mmu.c         |  3 ++-
 include/linux/page-flags.h | 16 ++++++++--------
 2 files changed, 10 insertions(+), 9 deletions(-)

-- 
2.30.1.766.gb4fecdf3b7-goog