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authorVladimir Davydov <vdavydov@parallels.com>2014-12-10 15:44:19 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2014-12-10 17:41:07 -0800
commitb047501cd9f11d5e1d54ea0f90e2b10754021a0e (patch)
tree5532702b7921006bc6ffd02a04e481c04fa20481 /mm/slab_common.c
parent4ef461e8f4dd13a2e64c6c8f00c420d62294e2d4 (diff)
memcg: use generic slab iterators for showing slabinfo
Let's use generic slab_start/next/stop for showing memcg caches info. In contrast to the current implementation, this will work even if all memcg caches' info doesn't fit into a seq buffer (a page), plus it simply looks neater. Actually, the main reason I do this isn't mere cleanup. I'm going to zap the memcg_slab_caches list, because I find it useless provided we have the slab_caches list, and this patch is a step in this direction. It should be noted that before this patch an attempt to read memory.kmem.slabinfo of a cgroup that doesn't have kmem limit set resulted in -EIO, while after this patch it will silently show nothing except the header, but I don't think it will frustrate anyone. Signed-off-by: Vladimir Davydov <vdavydov@parallels.com> Cc: Christoph Lameter <cl@linux.com> Cc: Pekka Enberg <penberg@kernel.org> Cc: David Rientjes <rientjes@google.com> Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com> Cc: Johannes Weiner <hannes@cmpxchg.org> Cc: Michal Hocko <mhocko@suse.cz> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/slab_common.c')
-rw-r--r--mm/slab_common.c25
1 files changed, 19 insertions, 6 deletions
diff --git a/mm/slab_common.c b/mm/slab_common.c
index 2a3f5ff410cf..e03dd6f2a272 100644
--- a/mm/slab_common.c
+++ b/mm/slab_common.c
@@ -811,7 +811,7 @@ EXPORT_SYMBOL(kmalloc_order_trace);
#define SLABINFO_RIGHTS S_IRUSR
#endif
-void print_slabinfo_header(struct seq_file *m)
+static void print_slabinfo_header(struct seq_file *m)
{
/*
* Output format version, so at least we can change it
@@ -876,7 +876,7 @@ memcg_accumulate_slabinfo(struct kmem_cache *s, struct slabinfo *info)
}
}
-int cache_show(struct kmem_cache *s, struct seq_file *m)
+static void cache_show(struct kmem_cache *s, struct seq_file *m)
{
struct slabinfo sinfo;
@@ -895,7 +895,6 @@ int cache_show(struct kmem_cache *s, struct seq_file *m)
sinfo.active_slabs, sinfo.num_slabs, sinfo.shared_avail);
slabinfo_show_stats(m, s);
seq_putc(m, '\n');
- return 0;
}
static int slab_show(struct seq_file *m, void *p)
@@ -904,10 +903,24 @@ static int slab_show(struct seq_file *m, void *p)
if (p == slab_caches.next)
print_slabinfo_header(m);
- if (!is_root_cache(s))
- return 0;
- return cache_show(s, m);
+ if (is_root_cache(s))
+ cache_show(s, m);
+ return 0;
+}
+
+#ifdef CONFIG_MEMCG_KMEM
+int memcg_slab_show(struct seq_file *m, void *p)
+{
+ struct kmem_cache *s = list_entry(p, struct kmem_cache, list);
+ struct mem_cgroup *memcg = mem_cgroup_from_css(seq_css(m));
+
+ if (p == slab_caches.next)
+ print_slabinfo_header(m);
+ if (!is_root_cache(s) && s->memcg_params->memcg == memcg)
+ cache_show(s, m);
+ return 0;
}
+#endif
/*
* slabinfo_op - iterator that generates /proc/slabinfo