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-rw-r--r--include/linux/slab.h24
1 files changed, 24 insertions, 0 deletions
diff --git a/include/linux/slab.h b/include/linux/slab.h
index 743a10415122..00efba149222 100644
--- a/include/linux/slab.h
+++ b/include/linux/slab.h
@@ -177,6 +177,30 @@ void kmem_cache_free(struct kmem_cache *, void *);
#endif
/*
+ * This is the main placeholder for memcg-related information in kmem caches.
+ * struct kmem_cache will hold a pointer to it, so the memory cost while
+ * disabled is 1 pointer. The runtime cost while enabled, gets bigger than it
+ * would otherwise be if that would be bundled in kmem_cache: we'll need an
+ * extra pointer chase. But the trade off clearly lays in favor of not
+ * penalizing non-users.
+ *
+ * Both the root cache and the child caches will have it. For the root cache,
+ * this will hold a dynamically allocated array large enough to hold
+ * information about the currently limited memcgs in the system.
+ *
+ * Child caches will hold extra metadata needed for its operation. Fields are:
+ *
+ * @memcg: pointer to the memcg this cache belongs to
+ */
+struct memcg_cache_params {
+ bool is_root_cache;
+ union {
+ struct kmem_cache *memcg_caches[0];
+ struct mem_cgroup *memcg;
+ };
+};
+
+/*
* Common kmalloc functions provided by all allocators
*/
void * __must_check __krealloc(const void *, size_t, gfp_t);