linux-kernel - [RFC PATCH 0/4] pre sort pages on lruvec in pagevec

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Date:   Fri, 25 Dec 2020 17:59:46 +0800
From:   Alex Shi <alex.shi@...ux.alibaba.com>
To:     willy@...radead.org
Cc:     tim.c.chen@...ux.intel.com,
        Konstantin Khlebnikov <koct9i@...il.com>,
        Hugh Dickins <hughd@...gle.com>, Yu Zhao <yuzhao@...gle.com>,
        Michal Hocko <mhocko@...e.com>,
        Andrew Morton <akpm@...ux-foundation.org>, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org
Subject: [RFC PATCH 0/4] pre sort pages on lruvec in pagevec

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@...il.com>
Cc: Hugh Dickins <hughd@...gle.com>
Cc: Yu Zhao <yuzhao@...gle.com>
Cc: Michal Hocko <mhocko@...e.com>
Cc: Matthew Wilcox (Oracle) <willy@...radead.org>
Cc: Andrew Morton <akpm@...ux-foundation.org>
Cc: linux-mm@...ck.org
Cc: linux-kernel@...r.kernel.org

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

-- 
2.29.GIT