It prints page addresses in slub.
Useful for search of leaked objects (say, I found leaked dentry with this after
CT stop).
Signed-off-by: Stanislav Kinsburskiy <skinsbur...@virtuozzo.com>
---
mm/slub.c | 35 ++++++++++++++++++++++++++++++++++-
1 file changed, 34 insertions(+), 1 deletion(-)
diff --git a/mm/slub.c b/mm/slub.c
index 96a7aba..91a4de1 100644
--- a/mm/slub.c
+++ b/mm/slub.c
@@ -4559,7 +4559,8 @@ enum slab_stat_type {
SL_PARTIAL, /* Only partially allocated slabs */
SL_CPU, /* Only slabs used for cpu caches */
SL_OBJECTS, /* Determine allocated objects not slabs */
- SL_TOTAL /* Determine object capacity not slabs */
+ SL_TOTAL, /* Determine object capacity not slabs */
+ SL_PAGES
};
#define SO_ALL (1 << SL_ALL)
@@ -4567,6 +4568,20 @@ enum slab_stat_type {
#define SO_CPU (1 << SL_CPU)
#define SO_OBJECTS (1 << SL_OBJECTS)
#define SO_TOTAL (1 << SL_TOTAL)
+#define SO_PAGES (1 << SL_PAGES)
+
+static unsigned long print_pages(struct kmem_cache_node *n, char *buf)
+{
+ unsigned long flags;
+ unsigned long x = 0;
+ struct page *page;
+
+ spin_lock_irqsave(&n->list_lock, flags);
+ list_for_each_entry(page, &n->partial, lru)
+ x += sprintf(buf + x, "%p\n", page_address(page));
+ spin_unlock_irqrestore(&n->list_lock, flags);
+ return x;
+}
static ssize_t show_slab_objects(struct kmem_cache *s,
char *buf, unsigned long flags)
@@ -4582,6 +4597,17 @@ static ssize_t show_slab_objects(struct kmem_cache *s,
return -ENOMEM;
per_cpu = nodes + nr_node_ids;
+ if (flags & SO_PAGES) {
+ x = 0;
+ for_each_node_state(node, N_NORMAL_MEMORY) {
+ struct kmem_cache_node *n = get_node(s, node);
+
+ x += print_pages(n, buf + x);
+ }
+ kfree(nodes);
+ return x;
+ }
+
if (flags & SO_CPU) {
int cpu;
@@ -4831,6 +4857,12 @@ static ssize_t objects_partial_show(struct kmem_cache
*s, char *buf)
}
SLAB_ATTR_RO(objects_partial);
+static ssize_t pages_show(struct kmem_cache *s, char *buf)
+{
+ return show_slab_objects(s, buf, SO_PAGES);
+}
+SLAB_ATTR_RO(pages);
+
static ssize_t slabs_cpu_partial_show(struct kmem_cache *s, char *buf)
{
int objects = 0;
@@ -5257,6 +5289,7 @@ static struct attribute *slab_attrs[] = {
&failslab_attr.attr,
#endif
+ &pages_attr.attr,
NULL
};
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