mm: swap: relaim the cached parts that got scanned

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This commit implements reclaim during scan for cluster allocator.

Cluster scanning were unable to reuse SWAP_HAS_CACHE slots, which could
result in low allocation success rate or early OOM.

So to ensure maximum allocation success rate, integrate reclaiming with
scanning.  If found a range of suitable swap slots but fragmented due to
HAS_CACHE, just try to reclaim the slots.

Link: https://lkml.kernel.org/r/20240730-swap-allocator-v5-8-cb9c148b9297@kernel.org
Signed-off-by: Kairui Song <kasong@tencent.com>
Reported-by: Barry Song <21cnbao@gmail.com>
Cc: Chris Li <chrisl@kernel.org>
Cc: "Huang, Ying" <ying.huang@intel.com>
Cc: Hugh Dickins <hughd@google.com>
Cc: Kalesh Singh <kaleshsingh@google.com>
Cc: Ryan Roberts <ryan.roberts@arm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

...

This commit is contained in:

Kairui Song 2024-07-30 23:49:20 -07:00 • committed by Andrew Morton

parent 477cb7ba28

commit 661383c611

2 changed files with 110 additions and 31 deletions

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1

include/linux/swap.h

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144

mm/swapfile.c

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