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Subject[PATCH 2/2] mm/slub: reset cpu_slab's pointer in deactivate_slab()
Date
Each time a slab is deactivated, the page and freelist pointer should be
reset.

This patch just merges these two options into deactivate_slab().

Signed-off-by: Wei Yang <richard.weiyang@gmail.com>
---
mm/slub.c | 21 ++++++++-------------
1 file changed, 8 insertions(+), 13 deletions(-)

diff --git a/mm/slub.c b/mm/slub.c
index 83332f19d226..9e4e682243a1 100644
--- a/mm/slub.c
+++ b/mm/slub.c
@@ -1993,7 +1993,7 @@ static void init_kmem_cache_cpus(struct kmem_cache *s)
* Remove the cpu slab
*/
static void deactivate_slab(struct kmem_cache *s, struct page *page,
- void *freelist)
+ void *freelist, struct kmem_cache_cpu *c)
{
enum slab_modes { M_NONE, M_PARTIAL, M_FULL, M_FREE };
struct kmem_cache_node *n = get_node(s, page_to_nid(page));
@@ -2132,6 +2132,9 @@ static void deactivate_slab(struct kmem_cache *s, struct page *page,
discard_slab(s, page);
stat(s, FREE_SLAB);
}
+
+ c->page = NULL;
+ c->freelist = NULL;
}

/*
@@ -2266,11 +2269,9 @@ static void put_cpu_partial(struct kmem_cache *s, struct page *page, int drain)
static inline void flush_slab(struct kmem_cache *s, struct kmem_cache_cpu *c)
{
stat(s, CPUSLAB_FLUSH);
- deactivate_slab(s, c->page, c->freelist);
+ deactivate_slab(s, c->page, c->freelist, c);

c->tid = next_tid(c->tid);
- c->page = NULL;
- c->freelist = NULL;
}

/*
@@ -2521,9 +2522,7 @@ static void *___slab_alloc(struct kmem_cache *s, gfp_t gfpflags, int node,

if (unlikely(!node_match(page, searchnode))) {
stat(s, ALLOC_NODE_MISMATCH);
- deactivate_slab(s, page, c->freelist);
- c->page = NULL;
- c->freelist = NULL;
+ deactivate_slab(s, page, c->freelist, c);
goto new_slab;
}
}
@@ -2534,9 +2533,7 @@ static void *___slab_alloc(struct kmem_cache *s, gfp_t gfpflags, int node,
* information when the page leaves the per-cpu allocator
*/
if (unlikely(!pfmemalloc_match(page, gfpflags))) {
- deactivate_slab(s, page, c->freelist);
- c->page = NULL;
- c->freelist = NULL;
+ deactivate_slab(s, page, c->freelist, c);
goto new_slab;
}

@@ -2591,9 +2588,7 @@ static void *___slab_alloc(struct kmem_cache *s, gfp_t gfpflags, int node,
!alloc_debug_processing(s, page, freelist, addr))
goto new_slab; /* Slab failed checks. Next slab needed */

- deactivate_slab(s, page, get_freepointer(s, freelist));
- c->page = NULL;
- c->freelist = NULL;
+ deactivate_slab(s, page, get_freepointer(s, freelist), c);
return freelist;
}

--
2.11.0
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