mm/slab: allow specifying free pointer offset when using constructor

Browse source

When a slab cache has a constructor, the free pointer is placed after the
object because certain fields must not be overwritten even after the
object is freed.

However, some fields that the constructor does not initialize can safely
be overwritten after free. Allow specifying the free pointer offset within
the object, reducing the overall object size when some fields can be reused
for the free pointer.

Adjust the document accordingly.

Signed-off-by: Harry Yoo <harry.yoo@oracle.com>
Link: https://patch.msgid.link/20260113061845.159790-3-harry.yoo@oracle.com
Signed-off-by: Vlastimil Babka <vbabka@suse.cz>

...

This commit is contained in:

Harry Yoo 2026-01-13 15:18:38 +09:00 • committed by Vlastimil Babka

parent b85f369b81

commit a13b68d79d

3 changed files with 21 additions and 17 deletions

Show all changes Ignore whitespace when comparing lines Ignore changes in amount of whitespace Ignore changes in whitespace at EOL

Download patch file Download diff file Expand all files Collapse all files

30

include/linux/slab.h

View file

2

mm/slab_common.c

View file

6

mm/slub.c

View file