The patch titled
Subject: radix-tree: account nodes to memcg only if explicitly requested
has been added to the -mm tree. Its filename is
radix-tree-account-nodes-to-memcg-only-if-explicitly-requested.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/radix-tree-account-nodes-to-memcg-only-if-explicitly-requested.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/radix-tree-account-nodes-to-memcg-only-if-explicitly-requested.patch
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*** Remember to use Documentation/SubmitChecklist when testing your code ***
The -mm tree is included into linux-next and is updated
there every 3-4 working days
------------------------------------------------------
From: Vladimir Davydov <vdavydov@xxxxxxxxxxxxx>
Subject: radix-tree: account nodes to memcg only if explicitly requested
Radix trees may be used not only for storing page cache pages, so
unconditionally accounting radix tree nodes to the current memory cgroup
is bad: if a radix tree node is used for storing data shared among
different cgroups we risk pinning dead memory cgroups forever. So let's
only account radix tree nodes if it was explicitly requested by passing
__GFP_ACCOUNT to INIT_RADIX_TREE. Currently, we only want to account
page cache entries, so mark mapping->page_tree so.
Link: http://lkml.kernel.org/r/1470057188-7864-1-git-send-email-vdavydov@xxxxxxxxxxxxx
Signed-off-by: Vladimir Davydov <vdavydov@xxxxxxxxxxxxx>
Acked-by: Johannes Weiner <hannes@xxxxxxxxxxx>
Cc: Michal Hocko <mhocko@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
fs/inode.c | 2 +-
lib/radix-tree.c | 14 ++++++++++----
2 files changed, 11 insertions(+), 5 deletions(-)
diff -puN fs/inode.c~radix-tree-account-nodes-to-memcg-only-if-explicitly-requested fs/inode.c
--- a/fs/inode.c~radix-tree-account-nodes-to-memcg-only-if-explicitly-requested
+++ a/fs/inode.c
@@ -345,7 +345,7 @@ EXPORT_SYMBOL(inc_nlink);
void address_space_init_once(struct address_space *mapping)
{
memset(mapping, 0, sizeof(*mapping));
- INIT_RADIX_TREE(&mapping->page_tree, GFP_ATOMIC);
+ INIT_RADIX_TREE(&mapping->page_tree, GFP_ATOMIC | __GFP_ACCOUNT);
spin_lock_init(&mapping->tree_lock);
init_rwsem(&mapping->i_mmap_rwsem);
INIT_LIST_HEAD(&mapping->private_list);
diff -puN lib/radix-tree.c~radix-tree-account-nodes-to-memcg-only-if-explicitly-requested lib/radix-tree.c
--- a/lib/radix-tree.c~radix-tree-account-nodes-to-memcg-only-if-explicitly-requested
+++ a/lib/radix-tree.c
@@ -277,10 +277,11 @@ radix_tree_node_alloc(struct radix_tree_
/*
* Even if the caller has preloaded, try to allocate from the
- * cache first for the new node to get accounted.
+ * cache first for the new node to get accounted to the memory
+ * cgroup.
*/
ret = kmem_cache_alloc(radix_tree_node_cachep,
- gfp_mask | __GFP_ACCOUNT | __GFP_NOWARN);
+ gfp_mask | __GFP_NOWARN);
if (ret)
goto out;
@@ -303,8 +304,7 @@ radix_tree_node_alloc(struct radix_tree_
kmemleak_update_trace(ret);
goto out;
}
- ret = kmem_cache_alloc(radix_tree_node_cachep,
- gfp_mask | __GFP_ACCOUNT);
+ ret = kmem_cache_alloc(radix_tree_node_cachep, gfp_mask);
out:
BUG_ON(radix_tree_is_internal_node(ret));
return ret;
@@ -351,6 +351,12 @@ static int __radix_tree_preload(gfp_t gf
struct radix_tree_node *node;
int ret = -ENOMEM;
+ /*
+ * Nodes preloaded by one cgroup can be be used by another cgroup, so
+ * they should never be accounted to any particular memory cgroup.
+ */
+ gfp_mask &= ~__GFP_ACCOUNT;
+
preempt_disable();
rtp = this_cpu_ptr(&radix_tree_preloads);
while (rtp->nr < nr) {
_
Patches currently in -mm which might be from vdavydov@xxxxxxxxxxxxx are
radix-tree-account-nodes-to-memcg-only-if-explicitly-requested.patch
mm-memcontrol-fix-swap-counter-leak-on-swapout-from-offline-cgroup.patch
mm-memcontrol-fix-memcg-id-ref-counter-on-swap-charge-move.patch
mm-memcontrol-add-sanity-checks-for-memcg-idref-on-get-put.patch
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