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Message-Id: <20231024093345.3676493-6-chengming.zhou@linux.dev>
Date: Tue, 24 Oct 2023 09:33:43 +0000
From: chengming.zhou@...ux.dev
To: cl@...ux.com, penberg@...nel.org
Cc: rientjes@...gle.com, iamjoonsoo.kim@....com,
akpm@...ux-foundation.org, vbabka@...e.cz,
roman.gushchin@...ux.dev, 42.hyeyoo@...il.com, linux-mm@...ck.org,
linux-kernel@...r.kernel.org, chengming.zhou@...ux.dev,
Chengming Zhou <zhouchengming@...edance.com>
Subject: [RFC PATCH v3 5/7] slub: Introduce freeze_slab()
From: Chengming Zhou <zhouchengming@...edance.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@...edance.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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