memcg, kmem: do not fail __GFP_NOFAIL charges

[linux-2.6-block.git] / mm / memcontrol.c

diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index 2156ef775d04beecd4f416d44eee76bb9012fcf2..c313c49074cad4916e7aa6b74968c548690a451d 100644 (file)
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -2943,6 +2943,16 @@ int __memcg_kmem_charge_memcg(struct page *page, gfp_t gfp, int order,
 
        if (!cgroup_subsys_on_dfl(memory_cgrp_subsys) &&
            !page_counter_try_charge(&memcg->kmem, nr_pages, &counter)) {
+
+               /*
+                * Enforce __GFP_NOFAIL allocation because callers are not
+                * prepared to see failures and likely do not have any failure
+                * handling code.
+                */
+               if (gfp & __GFP_NOFAIL) {
+                       page_counter_charge(&memcg->kmem, nr_pages);
+                       return 0;
+               }
                cancel_charge(memcg, nr_pages);
                return -ENOMEM;
        }