The patch titled
Subject: mm/zbud: reuse unbuddied[0] as buddied in zbud_pool
has been added to the -mm tree. Its filename is
mm-zbud-reuse-unbuddied-as-buddied-in-zbud_pool.patch
This patch should soon appear at
https://ozlabs.org/~akpm/mmots/broken-out/mm-zbud-reuse-unbuddied-as-buddied-in-zbud_pool.patch
and later at
https://ozlabs.org/~akpm/mmotm/broken-out/mm-zbud-reuse-unbuddied-as-buddied-in-zbud_pool.patch
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------------------------------------------------------
From: Miaohe Lin <linmiaohe@xxxxxxxxxx>
Subject: mm/zbud: reuse unbuddied[0] as buddied in zbud_pool
Patch series "Cleanups for zbud", v2.
This series contains just cleanups to save some possible memory in
zbud_pool and avoid exporting any unneeded zbud API. More details can be
found in the respective changelogs
This patch (of 2):
Since commit 9d8c5b5284e4 ("mm: zbud: fix condition check on allocation
size"), zbud_pool.unbuddied[0] is always unused. We can reuse it as
buddied field to save some possible memory.
Link: https://lkml.kernel.org/r/20210608114515.206992-1-linmiaohe@xxxxxxxxxx
Link: https://lkml.kernel.org/r/20210608114515.206992-2-linmiaohe@xxxxxxxxxx
Signed-off-by: Miaohe Lin <linmiaohe@xxxxxxxxxx>
Cc: Seth Jennings <sjenning@xxxxxxxxxx>
Cc: Dan Streetman <ddstreet@xxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/zbud.c | 10 ++++++++--
1 file changed, 8 insertions(+), 2 deletions(-)
--- a/mm/zbud.c~mm-zbud-reuse-unbuddied-as-buddied-in-zbud_pool
+++ a/mm/zbud.c
@@ -93,8 +93,14 @@
*/
struct zbud_pool {
spinlock_t lock;
- struct list_head unbuddied[NCHUNKS];
- struct list_head buddied;
+ union {
+ /*
+ * Reuse unbuddied[0] as buddied on the ground that
+ * unbuddied[0] is unused.
+ */
+ struct list_head buddied;
+ struct list_head unbuddied[NCHUNKS];
+ };
struct list_head lru;
u64 pages_nr;
const struct zbud_ops *ops;
_
Patches currently in -mm which might be from linmiaohe@xxxxxxxxxx are
mm-swapfile-use-percpu_ref-to-serialize-against-concurrent-swapoff.patch
swap-fix-do_swap_page-race-with-swapoff.patch
mm-swap-remove-confusing-checking-for-non_swap_entry-in-swap_ra_info.patch
mm-shmem-fix-shmem_swapin-race-with-swapoff.patch
mm-swapfile-move-get_swap_page_of_type-under-config_hibernation.patch
mm-swapfile-move-get_swap_page_of_type-under-config_hibernation-fix.patch
mm-swapfile-move-get_swap_page_of_type-under-config_hibernation-fix-2.patch
mm-swap-remove-unused-local-variable-nr_shadows.patch
mm-swap_slotsc-delete-meaningless-forward-declarations.patch
mm-swap-remove-unused-global-variable-nr_swapper_spaces.patch
mm-huge_memoryc-remove-dedicated-macro-hpage_cache_index_mask.patch
mm-huge_memoryc-use-page-deferred_list.patch
mm-huge_memoryc-add-missing-read-only-thp-checking-in-transparent_hugepage_enabled.patch
mm-huge_memoryc-add-missing-read-only-thp-checking-in-transparent_hugepage_enabled-v4.patch
mm-huge_memoryc-remove-unnecessary-tlb_remove_page_size-for-huge-zero-pmd.patch
mm-huge_memoryc-dont-discard-hugepage-if-other-processes-are-mapping-it.patch
mm-zbud-reuse-unbuddied-as-buddied-in-zbud_pool.patch
mm-zbud-dont-export-any-zbud-api.patch
mm-zswapc-remove-unused-function-zswap_debugfs_exit.patch
mm-zswapc-avoid-unnecessary-copy-in-at-map-time.patch
mm-zswapc-fix-two-bugs-in-zswap_writeback_entry.patch
