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| author | Li Zefan <lizefan@huawei.com> | 2013-09-10 11:43:37 +0800 |
|---|---|---|
| committer | Pekka Enberg <penberg@kernel.org> | 2013-12-29 13:44:45 +0200 |
| commit | 8afb1474db4701d1ab80cd8251137a3260e6913e (patch) | |
| tree | 34f9ac6ef791ed6c00dbd0a6ddabb419c67bd813 /mm/slub.c | |
| parent | e1168c2cc4a5a5e495a53e067a6be6b4f29abfe0 (diff) | |
| download | lwn-8afb1474db4701d1ab80cd8251137a3260e6913e.tar.gz lwn-8afb1474db4701d1ab80cd8251137a3260e6913e.zip | |
slub: Fix calculation of cpu slabs
/sys/kernel/slab/:t-0000048 # cat cpu_slabs
231 N0=16 N1=215
/sys/kernel/slab/:t-0000048 # cat slabs
145 N0=36 N1=109
See, the number of slabs is smaller than that of cpu slabs.
The bug was introduced by commit 49e2258586b423684f03c278149ab46d8f8b6700
("slub: per cpu cache for partial pages").
We should use page->pages instead of page->pobjects when calculating
the number of cpu partial slabs. This also fixes the mapping of slabs
and nodes.
As there's no variable storing the number of total/active objects in
cpu partial slabs, and we don't have user interfaces requiring those
statistics, I just add WARN_ON for those cases.
Cc: <stable@vger.kernel.org> # 3.2+
Acked-by: Christoph Lameter <cl@linux.com>
Reviewed-by: Wanpeng Li <liwanp@linux.vnet.ibm.com>
Signed-off-by: Li Zefan <lizefan@huawei.com>
Signed-off-by: Pekka Enberg <penberg@kernel.org>
Diffstat (limited to 'mm/slub.c')
| -rw-r--r-- | mm/slub.c | 8 |
1 files changed, 7 insertions, 1 deletions
diff --git a/mm/slub.c b/mm/slub.c index 545a170ebf9f..89490d9d91e0 100644 --- a/mm/slub.c +++ b/mm/slub.c @@ -4299,7 +4299,13 @@ static ssize_t show_slab_objects(struct kmem_cache *s, page = ACCESS_ONCE(c->partial); if (page) { - x = page->pobjects; + node = page_to_nid(page); + if (flags & SO_TOTAL) + WARN_ON_ONCE(1); + else if (flags & SO_OBJECTS) + WARN_ON_ONCE(1); + else + x = page->pages; total += x; nodes[node] += x; } |