diff options
| author | Kairui Song <kasong@tencent.com> | 2025-09-17 00:01:00 +0800 |
|---|---|---|
| committer | Andrew Morton <akpm@linux-foundation.org> | 2025-09-21 14:22:25 -0700 |
| commit | f83938e4188c44b535c18903a9761759366aa626 (patch) | |
| tree | c48e3a34e9d8b83c5b209f8c420bded56a2547d9 /mm/swap_table.h | |
| parent | mm, swap: implement dynamic allocation of swap table (diff) | |
| download | linux-f83938e4188c44b535c18903a9761759366aa626.tar.gz linux-f83938e4188c44b535c18903a9761759366aa626.zip | |
mm, swap: use a single page for swap table when the size fits
We have a cluster size of 512 slots. Each slot consumes 8 bytes in swap
table so the swap table size of each cluster is exactly one page (4K).
If that condition is true, allocate one page direct and disable the slab
cache to reduce the memory usage of swap table and avoid fragmentation.
Link: https://lkml.kernel.org/r/20250916160100.31545-16-ryncsn@gmail.com
Co-developed-by: Chris Li <chrisl@kernel.org>
Signed-off-by: Chris Li <chrisl@kernel.org>
Signed-off-by: Kairui Song <kasong@tencent.com>
Acked-by: Chris Li <chrisl@kernel.org>
Suggested-by: Chris Li <chrisl@kernel.org>
Reviewed-by: Barry Song <baohua@kernel.org>
Cc: Baolin Wang <baolin.wang@linux.alibaba.com>
Cc: Baoquan He <bhe@redhat.com>
Cc: David Hildenbrand <david@redhat.com>
Cc: "Huang, Ying" <ying.huang@linux.alibaba.com>
Cc: Hugh Dickins <hughd@google.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Kemeng Shi <shikemeng@huaweicloud.com>
Cc: kernel test robot <oliver.sang@intel.com>
Cc: Lorenzo Stoakes <lorenzo.stoakes@oracle.com>
Cc: Matthew Wilcox (Oracle) <willy@infradead.org>
Cc: Nhat Pham <nphamcs@gmail.com>
Cc: Yosry Ahmed <yosryahmed@google.com>
Cc: Zi Yan <ziy@nvidia.com>
Cc: SeongJae Park <sj@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Diffstat (limited to 'mm/swap_table.h')
| -rw-r--r-- | mm/swap_table.h | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/mm/swap_table.h b/mm/swap_table.h index 52254e455304..ea244a57a5b7 100644 --- a/mm/swap_table.h +++ b/mm/swap_table.h @@ -11,6 +11,8 @@ struct swap_table { atomic_long_t entries[SWAPFILE_CLUSTER]; }; +#define SWP_TABLE_USE_PAGE (sizeof(struct swap_table) == PAGE_SIZE) + /* * A swap table entry represents the status of a swap slot on a swap * (physical or virtual) device. The swap table in each cluster is a |