mm/slab: use stride to access slabobj_ext

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Use a configurable stride value when accessing slab object extension
metadata instead of assuming a fixed sizeof(struct slabobj_ext).

Store stride value in free bits of slab->counters field. This allows
for flexibility in cases where the extension is embedded within
slab objects.

Since these free bits exist only on 64-bit, any future optimizations
that need to change stride value cannot be enabled on 32-bit architectures.

Suggested-by: Vlastimil Babka <vbabka@suse.cz>
Reviewed-by: Suren Baghdasaryan <surenb@google.com>
Signed-off-by: Harry Yoo <harry.yoo@oracle.com>
Link: https://patch.msgid.link/20260113061845.159790-6-harry.yoo@oracle.com
Signed-off-by: Vlastimil Babka <vbabka@suse.cz>

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Harry Yoo 2026-01-13 15:18:41 +09:00 • committed by Vlastimil Babka

parent 52f1ca8a45

commit 7a8e71bc61

2 changed files with 35 additions and 4 deletions

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37

mm/slab.h

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2

mm/slub.c

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