This idea was tried on per memcg lru lock patchset v18, and had a good result, about 5%~20+% performance gain on lru lock busy benchmarks, like case-lru-file-readtwice. But on the latest kernel, I can not reproduce the result on my box. Also I can not reproduce Tim's performance gain too on my box. So I don't know if it's workable in some scenario, just sent out if someone has interesting... Alex Shi (4): mm/swap.c: pre-sort pages in pagevec for pagevec_lru_move_fn mm/swap.c: bail out early for no memcg and no numa mm/swap.c: extend the usage to pagevec_lru_add mm/swap.c: no sort if all page's lruvec are same Cc: Konstantin Khlebnikov <koct9i@xxxxxxxxx> Cc: Hugh Dickins <hughd@xxxxxxxxxx> Cc: Yu Zhao <yuzhao@xxxxxxxxxx> Cc: Michal Hocko <mhocko@xxxxxxxx> Cc: Matthew Wilcox (Oracle) <willy@xxxxxxxxxxxxx> Cc: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> Cc: linux-mm@xxxxxxxxx Cc: linux-kernel@xxxxxxxxxxxxxxx mm/swap.c | 118 +++++++++++++++++++++++++++++++++++++++++------------- 1 file changed, 91 insertions(+), 27 deletions(-) -- 2.29.GIT
