From 58e698af4c6347c726090d5480b2e51d1d07edf9 Mon Sep 17 00:00:00 2001 From: Vladimir Davydov Date: Thu, 17 Mar 2016 14:18:36 -0700 Subject: [PATCH] radix-tree: account radix_tree_node to memory cgroup Allocation of radix_tree_node objects can be easily triggered from userspace, so we should account them to memory cgroup. Besides, we need them accounted for making shadow node shrinker per memcg (see mm/workingset.c). A tricky thing about accounting radix_tree_node objects is that they are mostly allocated through radix_tree_preload(), so we can't just set SLAB_ACCOUNT for radix_tree_node_cachep - that would likely result in a lot of unrelated cgroups using objects from each other's caches. One way to overcome this would be making radix tree preloads per memcg, but that would probably look cumbersome and overcomplicated. Instead, we make radix_tree_node_alloc() first try to allocate from the cache with __GFP_ACCOUNT, no matter if the caller has preloaded or not, and only if it fails fall back on using per cpu preloads. This should make most allocations accounted. Signed-off-by: Vladimir Davydov Acked-by: Johannes Weiner Cc: Michal Hocko Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- lib/radix-tree.c | 16 +++++++++++++--- 1 file changed, 13 insertions(+), 3 deletions(-) diff --git a/lib/radix-tree.c b/lib/radix-tree.c index 6b79e9026e24..224b369f5a5e 100644 --- a/lib/radix-tree.c +++ b/lib/radix-tree.c @@ -191,6 +191,15 @@ radix_tree_node_alloc(struct radix_tree_root *root) if (!gfpflags_allow_blocking(gfp_mask) && !in_interrupt()) { struct radix_tree_preload *rtp; + /* + * Even if the caller has preloaded, try to allocate from the + * cache first for the new node to get accounted. + */ + ret = kmem_cache_alloc(radix_tree_node_cachep, + gfp_mask | __GFP_ACCOUNT | __GFP_NOWARN); + if (ret) + goto out; + /* * Provided the caller has preloaded here, we will always * succeed in getting a node here (and never reach @@ -208,10 +217,11 @@ radix_tree_node_alloc(struct radix_tree_root *root) * for debugging. */ kmemleak_update_trace(ret); + goto out; } - if (ret == NULL) - ret = kmem_cache_alloc(radix_tree_node_cachep, gfp_mask); - + ret = kmem_cache_alloc(radix_tree_node_cachep, + gfp_mask | __GFP_ACCOUNT); +out: BUG_ON(radix_tree_is_indirect_ptr(ret)); return ret; } -- GitLab