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 <koc...@gmail.com> Cc: Hugh Dickins <hu...@google.com> Cc: Yu Zhao <yuz...@google.com> Cc: Michal Hocko <mho...@suse.com> Cc: Matthew Wilcox (Oracle) <wi...@infradead.org> Cc: Andrew Morton <a...@linux-foundation.org> Cc: linux...@kvack.org Cc: linux-kernel@vger.kernel.org mm/swap.c | 118 +++++++++++++++++++++++++++++++++++++++++------------- 1 file changed, 91 insertions(+), 27 deletions(-) -- 2.29.GIT
