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slab: Add SL_partial flag

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Give slab its own name for this flag.  Keep the PG_workingset alias
information in one place.

Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Acked-by: Harry Yoo <harry.yoo@oracle.com>
Link: https://patch.msgid.link/20250611155916.2579160-4-willy@infradead.org
Signed-off-by: Vlastimil Babka <vbabka@suse.cz>
This commit is contained in:
Matthew Wilcox (Oracle)
2025-06-11 16:59:06 +01:00
committed by Vlastimil Babka
parent 30908096dd
commit c5c44900f4
1 changed files with 10 additions and 12 deletions
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22
mm/slub.c
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@@ -91,14 +91,14 @@
* The partially empty slabs cached on the CPU partial list are used
* for performance reasons, which speeds up the allocation process.
* These slabs are not frozen, but are also exempt from list management,
* by clearing the PG_workingset flag when moving out of the node
* by clearing the SL_partial flag when moving out of the node
* partial list. Please see __slab_free() for more details.
*
* To sum up, the current scheme is:
* - node partial slab: PG_Workingset && !frozen
* - cpu partial slab: !PG_Workingset && !frozen
* - cpu slab: !PG_Workingset && frozen
* - full slab: !PG_Workingset && !frozen
* - node partial slab: SL_partial && !frozen
* - cpu partial slab: !SL_partial && !frozen
* - cpu slab: !SL_partial && frozen
* - full slab: !SL_partial && !frozen
*
* list_lock
*
@@ -186,6 +186,7 @@
/**
* enum slab_flags - How the slab flags bits are used.
* @SL_locked: Is locked with slab_lock()
* @SL_partial: On the per-node partial list
*
* The slab flags share space with the page flags but some bits have
* different interpretations. The high bits are used for information
@@ -193,6 +194,7 @@
*/
enum slab_flags {
SL_locked = PG_locked,
SL_partial = PG_workingset, /* Historical reasons for this bit */
};
/*
@@ -2729,23 +2731,19 @@ static void discard_slab(struct kmem_cache *s, struct slab *slab)
free_slab(s, slab);
}
/*
* SLUB reuses PG_workingset bit to keep track of whether it's on
* the per-node partial list.
*/
static inline bool slab_test_node_partial(const struct slab *slab)
{
return folio_test_workingset(slab_folio(slab));
return test_bit(SL_partial, &slab->flags);
}
static inline void slab_set_node_partial(struct slab *slab)
{
set_bit(PG_workingset, folio_flags(slab_folio(slab), 0));
set_bit(SL_partial, &slab->flags);
}
static inline void slab_clear_node_partial(struct slab *slab)
{
clear_bit(PG_workingset, folio_flags(slab_folio(slab), 0));
clear_bit(SL_partial, &slab->flags);
}
/*