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[RFC,0/4] pre sort pages on lruvec in pagevec

Message ID 1608890390-64305-1-git-send-email-alex.shi@linux.alibaba.com (mailing list archive)
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Series pre sort pages on lruvec in pagevec | expand

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Alex Shi Dec. 25, 2020, 9:59 a.m. UTC 
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@gmail.com>
Cc: Hugh Dickins <hughd@google.com>
Cc: Yu Zhao <yuzhao@google.com>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Matthew Wilcox (Oracle) <willy@infradead.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: linux-mm@kvack.org
Cc: linux-kernel@vger.kernel.org

 mm/swap.c | 118 +++++++++++++++++++++++++++++++++++++++++-------------
 1 file changed, 91 insertions(+), 27 deletions(-)