Home » Mailing lists » Devel » [PATCH v2 00/29] kmem limitation for memcg
| [PATCH v2 26/29] memcg: Per-memcg memory.kmem.slabinfo file. [message #46318 is a reply to message #46299] |
Fri, 11 May 2012 17:44   |
Glauber Costa
Messages: 916
Registered: October 2011
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Senior Member |
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From: Suleiman Souhlal <ssouhlal@FreeBSD.org>
This file shows all the kmem_caches used by a memcg.
Signed-off-by: Suleiman Souhlal <suleiman@google.com>
---
include/linux/slab.h | 1 +
mm/memcontrol.c | 17 ++++++++++
mm/slab.c | 87 ++++++++++++++++++++++++++++++++++++-------------
mm/slub.c | 5 +++
4 files changed, 87 insertions(+), 23 deletions(-)
diff --git a/include/linux/slab.h b/include/linux/slab.h
index 876783b..e250111 100644
--- a/include/linux/slab.h
+++ b/include/linux/slab.h
@@ -330,6 +330,7 @@ extern void *__kmalloc_track_caller(size_t, gfp_t, unsigned long);
#define MAX_KMEM_CACHE_TYPES 400
extern struct kmem_cache *kmem_cache_dup(struct mem_cgroup *memcg,
struct kmem_cache *cachep);
+extern int mem_cgroup_slabinfo(struct mem_cgroup *mem, struct seq_file *m);
#else
#define MAX_KMEM_CACHE_TYPES 0
#endif /* CONFIG_CGROUP_MEM_RES_CTLR_KMEM */
diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index 933edf1..6b49b5e 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -5223,6 +5223,19 @@ static int mem_control_numa_stat_open(struct inode *unused, struct file *file)
#endif /* CONFIG_NUMA */
#ifdef CONFIG_CGROUP_MEM_RES_CTLR_KMEM
+static int mem_cgroup_slabinfo_show(struct cgroup *cgroup, struct cftype *ctf,
+ struct seq_file *m)
+{
+ struct mem_cgroup *mem;
+
+ mem = mem_cgroup_from_cont(cgroup);
+
+ if (mem == root_mem_cgroup)
+ mem = NULL;
+
+ return mem_cgroup_slabinfo(mem, m);
+}
+
static struct cftype kmem_cgroup_files[] = {
{
.name = "kmem.limit_in_bytes",
@@ -5247,6 +5260,10 @@ static struct cftype kmem_cgroup_files[] = {
.trigger = mem_cgroup_reset,
.read = mem_cgroup_read,
},
+ {
+ .name = "kmem.slabinfo",
+ .read_seq_string = mem_cgroup_slabinfo_show,
+ },
{},
};
diff --git a/mm/slab.c b/mm/slab.c
index cd4600d..afc26df 100644
--- a/mm/slab.c
+++ b/mm/slab.c
@@ -4523,21 +4523,26 @@ static void s_stop(struct seq_file *m, void *p)
mutex_unlock(&cache_chain_mutex);
}
-static int s_show(struct seq_file *m, void *p)
-{
- struct kmem_cache *cachep = list_entry(p, struct kmem_cache, next);
- struct slab *slabp;
+struct slab_counts {
unsigned long active_objs;
+ unsigned long active_slabs;
+ unsigned long num_slabs;
+ unsigned long free_objects;
+ unsigned long shared_avail;
unsigned long num_objs;
- unsigned long active_slabs = 0;
- unsigned long num_slabs, free_objects = 0, shared_avail = 0;
- const char *name;
- char *error = NULL;
- int node;
+};
+
+static char *
+get_slab_counts(struct kmem_cache *cachep, struct slab_counts *c)
+{
struct kmem_list3 *l3;
+ struct slab *slabp;
+ char *error;
+ int node;
+
+ error = NULL;
+ memset(c, 0, sizeof(struct slab_counts));
- active_objs = 0;
- num_slabs = 0;
for_each_online_node(node) {
l3 = cachep->nodelists[node];
if (!l3)
@@ -4549,31 +4554,43 @@ static int s_show(struct seq_file *m, void *p)
list_for_each_entry(slabp, &l3->slabs_full, list) {
if (slabp->inuse != cachep->num && !error)
error = "slabs_full accounting error";
- active_objs += cachep->num;
- active_slabs++;
+ c->active_objs += cachep->num;
+ c->active_slabs++;
}
list_for_each_entry(slabp, &l3->slabs_partial, list) {
if (slabp->inuse == cachep->num && !error)
error = "slabs_partial inuse accounting error";
if (!slabp->inuse && !error)
error = "slabs_partial/inuse accounting error";
- active_objs += slabp->inuse;
- active_slabs++;
+ c->active_objs += slabp->inuse;
+ c->active_slabs++;
}
list_for_each_entry(slabp, &l3->slabs_free, list) {
if (slabp->inuse && !error)
error = "slabs_free/inuse accounting error";
- num_slabs++;
+ c->num_slabs++;
}
- free_objects += l3->free_objects;
+ c->free_objects += l3->free_objects;
if (l3->shared)
- shared_avail += l3->shared->avail;
+ c->shared_avail += l3->shared->avail;
spin_unlock_irq(&l3->list_lock);
}
- num_slabs += active_slabs;
- num_objs = num_slabs * cachep->num;
- if (num_objs - active_objs != free_objects && !error)
+ c->num_slabs += c->active_slabs;
+ c->num_objs = c->num_slabs * cachep->num;
+
+ return error;
+}
+
+static int s_show(struct seq_file *m, void *p)
+{
+ struct kmem_cache *cachep = list_entry(p, struct kmem_cache, next);
+ struct slab_counts c;
+ const char *name;
+ char *error;
+
+ error = get_slab_counts(cachep, &c);
+ if (c.num_objs - c.active_objs != c.free_objects && !error)
error = "free_objects accounting error";
name = cachep->name;
@@ -4581,12 +4598,12 @@ static int s_show(struct seq_file *m, void *p)
printk(KERN_ERR "slab: cache %s error: %s\n", name, error);
seq_printf(m, "%-17s %6lu %6lu %6u %4u %4d",
- name, active_objs, num_objs, cachep->buffer_size,
+ name, c.active_objs, c.num_objs, cachep->buffer_size,
cachep->num, (1 << cachep->gfporder));
seq_printf(m, " : tunables %4u %4u %4u",
cachep->limit, cachep->batchcount, cachep->shared);
seq_printf(m, " : slabdata %6lu %6lu %6lu",
- active_slabs, num_slabs, shared_avail);
+ c.active_slabs, c.num_slabs, c.shared_avail);
#if STATS
{ /* list3 stats */
unsigned long high = cachep->high_mark;
@@ -4620,6 +4637,30 @@ static int s_show(struct seq_file *m, void *p)
return 0;
}
+#ifdef CONFIG_CGROUP_MEM_RES_CTLR_KMEM
+int mem_cgroup_slabinfo(struct mem_cgroup *memcg, struct seq_file *m)
+{
+ struct kmem_cache *cachep;
+ struct slab_counts c;
+
+ seq_printf(m, "# name <active_objs> <num_objs> <objsize>\n");
+
+ mutex_lock(&cache_chain_mutex);
+ list_for_each_entry(cachep, &cache_chain, next) {
+ if (cachep->memcg_params.memcg != memcg)
+ continue;
+
+ get_slab_counts(cachep, &c);
+
+ seq_printf(m, "%-17s %6lu %6lu %6u\n", cachep->name,
+ c.active_objs, c.num_objs, cachep->buffer_size);
+ }
+ mutex_unlock(&cache_chain_mutex);
+
+ return 0;
+}
+#endif /* CONFIG_CGROUP_MEM_RES_CTLR_KMEM */
+
/*
* slabinfo_op - iterator that generates /proc/slabinfo
*
diff --git a/mm/slub.c b/mm/slub.c
index f077b90..0efcd77 100644
--- a/mm/slub.c
+++ b/mm/slub.c
@@ -4156,6 +4156,11 @@ struct kmem_cache *kmem_cache_dup(struct mem_cgroup *memcg,
kfree(name);
return new;
}
+
+int mem_cgroup_slabinfo(struct mem_cgroup *memcg, struct seq_file *m)
+{
+ return 0;
+}
#endif
#ifdef CONFIG_SMP
--
1.7.7.6
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