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-rw-r--r--block/blk-cgroup.c8
-rw-r--r--mm/memcontrol.c24
2 files changed, 32 insertions, 0 deletions
diff --git a/block/blk-cgroup.c b/block/blk-cgroup.c
index 069bc202ffe3..63c3cd454d1e 100644
--- a/block/blk-cgroup.c
+++ b/block/blk-cgroup.c
@@ -925,6 +925,14 @@ struct cgroup_subsys blkio_cgrp_subsys = {
.css_free = blkcg_css_free,
.can_attach = blkcg_can_attach,
.base_cftypes = blkcg_files,
+#ifdef CONFIG_MEMCG
+ /*
+ * This ensures that, if available, memcg is automatically enabled
+ * together on the default hierarchy so that the owner cgroup can
+ * be retrieved from writeback pages.
+ */
+ .depends_on = 1 << memory_cgrp_id,
+#endif
};
EXPORT_SYMBOL_GPL(blkio_cgrp_subsys);
diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index a2c7bcb0e6eb..db536e90c8ee 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -6407,6 +6407,29 @@ static void mem_cgroup_css_free(struct cgroup_subsys_state *css)
__mem_cgroup_free(memcg);
}
+/**
+ * mem_cgroup_css_reset - reset the states of a mem_cgroup
+ * @css: the target css
+ *
+ * Reset the states of the mem_cgroup associated with @css. This is
+ * invoked when the userland requests disabling on the default hierarchy
+ * but the memcg is pinned through dependency. The memcg should stop
+ * applying policies and should revert to the vanilla state as it may be
+ * made visible again.
+ *
+ * The current implementation only resets the essential configurations.
+ * This needs to be expanded to cover all the visible parts.
+ */
+static void mem_cgroup_css_reset(struct cgroup_subsys_state *css)
+{
+ struct mem_cgroup *memcg = mem_cgroup_from_css(css);
+
+ mem_cgroup_resize_limit(memcg, ULLONG_MAX);
+ mem_cgroup_resize_memsw_limit(memcg, ULLONG_MAX);
+ memcg_update_kmem_limit(memcg, ULLONG_MAX);
+ res_counter_set_soft_limit(&memcg->res, ULLONG_MAX);
+}
+
#ifdef CONFIG_MMU
/* Handlers for move charge at task migration. */
#define PRECHARGE_COUNT_AT_ONCE 256
@@ -7019,6 +7042,7 @@ struct cgroup_subsys memory_cgrp_subsys = {
.css_online = mem_cgroup_css_online,
.css_offline = mem_cgroup_css_offline,
.css_free = mem_cgroup_css_free,
+ .css_reset = mem_cgroup_css_reset,
.can_attach = mem_cgroup_can_attach,
.cancel_attach = mem_cgroup_cancel_attach,
.attach = mem_cgroup_move_task,