The patch titled
Subject: mm/slub: reset cpu_slab's pointer in deactivate_slab()
has been added to the -mm tree. Its filename is
mm-slub-reset-cpu_slabs-pointer-in-deactivate_slab.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/mm-slub-reset-cpu_slabs-pointer-in-deactivate_slab.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/mm-slub-reset-cpu_slabs-pointer-in-deactivate_slab.patch
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------------------------------------------------------
From: Wei Yang <richard.weiyang@xxxxxxxxx>
Subject: mm/slub: reset cpu_slab's pointer in deactivate_slab()
Each time a slab is deactivated, the page and freelist pointer should be
reset.
This patch just merges these two options into deactivate_slab().
Link: http://lkml.kernel.org/r/20170507031215.3130-2-richard.weiyang@xxxxxxxxx
Signed-off-by: Wei Yang <richard.weiyang@xxxxxxxxx>
Cc: Christoph Lameter <cl@xxxxxxxxx>
Cc: Pekka Enberg <penberg@xxxxxxxxxx>
Cc: David Rientjes <rientjes@xxxxxxxxxx>
Cc: Joonsoo Kim <iamjoonsoo.kim@xxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/slub.c | 21 ++++++++-------------
1 file changed, 8 insertions(+), 13 deletions(-)
diff -puN mm/slub.c~mm-slub-reset-cpu_slabs-pointer-in-deactivate_slab mm/slub.c
--- a/mm/slub.c~mm-slub-reset-cpu_slabs-pointer-in-deactivate_slab
+++ a/mm/slub.c
@@ -1993,7 +1993,7 @@ static void init_kmem_cache_cpus(struct
* 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 @@ redo:
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_
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 @@ redo:
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 @@ redo:
* 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 @@ new_slab:
!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;
}
_
Patches currently in -mm which might be from richard.weiyang@xxxxxxxxx are
mm-slub-remove-a-redundant-assignment-in-___slab_alloc.patch
mm-slub-reset-cpu_slabs-pointer-in-deactivate_slab.patch
mm-page_alloc-return-0-in-case-this-node-has-no-page-within-the-zone.patch
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