mm, slub: remove percpu slabs with CONFIG_SLUB_TINY

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SLUB gets most of its scalability by percpu slabs. However for
CONFIG_SLUB_TINY the goal is minimal memory overhead, not scalability.
Thus, #ifdef out the whole kmem_cache_cpu percpu structure and
associated code. Additionally to the slab page savings, this reduces
percpu allocator usage, and code size.

This change builds on recent commit c7323a5ad0 ("mm/slub: restrict
sysfs validation to debug caches and make it safe"), as caches with
enabled debugging also avoid percpu slabs and all allocations and
freeing ends up working with the partial list. With a bit more
refactoring by the preceding patches, use the same code paths with
CONFIG_SLUB_TINY.

Signed-off-by: Vlastimil Babka <vbabka@suse.cz>
Acked-by: Mike Rapoport <rppt@linux.ibm.com>
Reviewed-by: Christoph Lameter <cl@linux.com>

...

This commit is contained in:

Vlastimil Babka 2022-11-15 18:14:31 +01:00

parent 56d5a2b9ba

commit 0af8489b02

2 changed files with 103 additions and 3 deletions

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include/linux/slub_def.h

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