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-rw-r--r--mm/percpu-internal.h55
1 files changed, 54 insertions, 1 deletions
diff --git a/mm/percpu-internal.h b/mm/percpu-internal.h
index 0468ba500bd4..18b768ac7dca 100644
--- a/mm/percpu-internal.h
+++ b/mm/percpu-internal.h
@@ -6,6 +6,25 @@
#include <linux/percpu.h>
/*
+ * There are two chunk types: root and memcg-aware.
+ * Chunks of each type have separate slots list.
+ *
+ * Memcg-aware chunks have an attached vector of obj_cgroup pointers, which is
+ * used to store memcg membership data of a percpu object. Obj_cgroups are
+ * ref-counted pointers to a memory cgroup with an ability to switch dynamically
+ * to the parent memory cgroup. This allows to reclaim a deleted memory cgroup
+ * without reclaiming of all outstanding objects, which hold a reference at it.
+ */
+enum pcpu_chunk_type {
+ PCPU_CHUNK_ROOT,
+#ifdef CONFIG_MEMCG_KMEM
+ PCPU_CHUNK_MEMCG,
+#endif
+ PCPU_NR_CHUNK_TYPES,
+ PCPU_FAIL_ALLOC = PCPU_NR_CHUNK_TYPES
+};
+
+/*
* pcpu_block_md is the metadata block struct.
* Each chunk's bitmap is split into a number of full blocks.
* All units are in terms of bits.
@@ -54,6 +73,9 @@ struct pcpu_chunk {
int end_offset; /* additional area required to
have the region end page
aligned */
+#ifdef CONFIG_MEMCG_KMEM
+ struct obj_cgroup **obj_cgroups; /* vector of object cgroups */
+#endif
int nr_pages; /* # of pages served by this chunk */
int nr_populated; /* # of populated pages */
@@ -63,7 +85,7 @@ struct pcpu_chunk {
extern spinlock_t pcpu_lock;
-extern struct list_head *pcpu_slot;
+extern struct list_head *pcpu_chunk_lists;
extern int pcpu_nr_slots;
extern int pcpu_nr_empty_pop_pages;
@@ -106,6 +128,37 @@ static inline int pcpu_chunk_map_bits(struct pcpu_chunk *chunk)
return pcpu_nr_pages_to_map_bits(chunk->nr_pages);
}
+#ifdef CONFIG_MEMCG_KMEM
+static inline enum pcpu_chunk_type pcpu_chunk_type(struct pcpu_chunk *chunk)
+{
+ if (chunk->obj_cgroups)
+ return PCPU_CHUNK_MEMCG;
+ return PCPU_CHUNK_ROOT;
+}
+
+static inline bool pcpu_is_memcg_chunk(enum pcpu_chunk_type chunk_type)
+{
+ return chunk_type == PCPU_CHUNK_MEMCG;
+}
+
+#else
+static inline enum pcpu_chunk_type pcpu_chunk_type(struct pcpu_chunk *chunk)
+{
+ return PCPU_CHUNK_ROOT;
+}
+
+static inline bool pcpu_is_memcg_chunk(enum pcpu_chunk_type chunk_type)
+{
+ return false;
+}
+#endif
+
+static inline struct list_head *pcpu_chunk_list(enum pcpu_chunk_type chunk_type)
+{
+ return &pcpu_chunk_lists[pcpu_nr_slots *
+ pcpu_is_memcg_chunk(chunk_type)];
+}
+
#ifdef CONFIG_PERCPU_STATS
#include <linux/spinlock.h>