Messages in this thread Patch in this message | | | From | chengming.zhou@linux ... | Subject | [RFC PATCH v3 5/7] slub: Introduce freeze_slab() | Date | Tue, 24 Oct 2023 09:33:43 +0000 |
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From: Chengming Zhou <zhouchengming@bytedance.com>
We will have unfrozen slabs out of the node partial list later, so we need a freeze_slab() function to freeze the partial slab and get its freelist.
Signed-off-by: Chengming Zhou <zhouchengming@bytedance.com> --- mm/slub.c | 27 +++++++++++++++++++++++++++ 1 file changed, 27 insertions(+)
diff --git a/mm/slub.c b/mm/slub.c index 7d0234bffad3..5b428648021f 100644 --- a/mm/slub.c +++ b/mm/slub.c @@ -3079,6 +3079,33 @@ static inline void *get_freelist(struct kmem_cache *s, struct slab *slab) return freelist; } +/* + * Freeze the partial slab and return the pointer to the freelist. + */ +static inline void *freeze_slab(struct kmem_cache *s, struct slab *slab) +{ + struct slab new; + unsigned long counters; + void *freelist; + + do { + freelist = slab->freelist; + counters = slab->counters; + + new.counters = counters; + VM_BUG_ON(new.frozen); + + new.inuse = slab->objects; + new.frozen = 1; + + } while (!__slab_update_freelist(s, slab, + freelist, counters, + NULL, new.counters, + "freeze_slab")); + + return freelist; +} + /* * Slow path. The lockless freelist is empty or we need to perform * debugging duties. -- 2.40.1
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