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| author | Matthew Wilcox (Oracle) <willy@infradead.org> | 2024-03-21 14:24:45 +0000 |
|---|---|---|
| committer | Andrew Morton <akpm@linux-foundation.org> | 2024-04-25 20:56:00 -0700 |
| commit | 46df8e73a4a3f1445f2a8429111e72ede1f4d291 (patch) | |
| tree | 06f3131bd2de34e954040b566884111a93012cf2 /mm/slab.h | |
| parent | 8682a7be36d8c6ebd484753034a716a13f8a1f54 (diff) | |
| download | lwn-46df8e73a4a3f1445f2a8429111e72ede1f4d291.tar.gz lwn-46df8e73a4a3f1445f2a8429111e72ede1f4d291.zip | |
mm: free up PG_slab
Reclaim the Slab page flag by using a spare bit in PageType. We are
perennially short of page flags for various purposes, and now that the
original SLAB allocator has been retired, SLUB does not use the
mapcount/page_type field. This lets us remove a number of special cases
for ignoring mapcount on Slab pages.
[willy@infradead.org: update vmcoreinfo]
Link: https://lkml.kernel.org/r/ZgGV-O8WYQ_83kxp@casper.infradead.org
Link: https://lkml.kernel.org/r/20240321142448.1645400-8-willy@infradead.org
Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Acked-by: David Hildenbrand <david@redhat.com>
Cc: Miaohe Lin <linmiaohe@huawei.com>
Cc: Muchun Song <muchun.song@linux.dev>
Cc: Oscar Salvador <osalvador@suse.de>
Cc: Vlastimil Babka <vbabka@suse.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Diffstat (limited to 'mm/slab.h')
| -rw-r--r-- | mm/slab.h | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/mm/slab.h b/mm/slab.h index 65db525e93af..1343bfa12cee 100644 --- a/mm/slab.h +++ b/mm/slab.h @@ -84,8 +84,8 @@ struct slab { }; struct rcu_head rcu_head; }; - unsigned int __unused; + unsigned int __page_type; atomic_t __page_refcount; #ifdef CONFIG_SLAB_OBJ_EXT unsigned long obj_exts; |