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authorVladimir Davydov <vdavydov@virtuozzo.com>2016-01-14 15:18:21 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2016-01-14 16:00:49 -0800
commit5d097056c9a017a3b720849efb5432f37acabbac (patch)
treee960a2513a789101097e97cfda27b247ef8650eb /fs/dcache.c
parent37f08dda29dac8a595999b8d3eaa9bf0f763dd9d (diff)
downloadop-kernel-dev-5d097056c9a017a3b720849efb5432f37acabbac.zip
op-kernel-dev-5d097056c9a017a3b720849efb5432f37acabbac.tar.gz
kmemcg: account certain kmem allocations to memcg
Mark those kmem allocations that are known to be easily triggered from userspace as __GFP_ACCOUNT/SLAB_ACCOUNT, which makes them accounted to memcg. For the list, see below: - threadinfo - task_struct - task_delay_info - pid - cred - mm_struct - vm_area_struct and vm_region (nommu) - anon_vma and anon_vma_chain - signal_struct - sighand_struct - fs_struct - files_struct - fdtable and fdtable->full_fds_bits - dentry and external_name - inode for all filesystems. This is the most tedious part, because most filesystems overwrite the alloc_inode method. The list is far from complete, so feel free to add more objects. Nevertheless, it should be close to "account everything" approach and keep most workloads within bounds. Malevolent users will be able to breach the limit, but this was possible even with the former "account everything" approach (simply because it did not account everything in fact). [akpm@linux-foundation.org: coding-style fixes] Signed-off-by: Vladimir Davydov <vdavydov@virtuozzo.com> Acked-by: Johannes Weiner <hannes@cmpxchg.org> Acked-by: Michal Hocko <mhocko@suse.com> Cc: Tejun Heo <tj@kernel.org> Cc: Greg Thelen <gthelen@google.com> Cc: Christoph Lameter <cl@linux.com> Cc: Pekka Enberg <penberg@kernel.org> Cc: David Rientjes <rientjes@google.com> Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'fs/dcache.c')
-rw-r--r--fs/dcache.c5
1 files changed, 3 insertions, 2 deletions
diff --git a/fs/dcache.c b/fs/dcache.c
index 8d38cd0..b4539e8 100644
--- a/fs/dcache.c
+++ b/fs/dcache.c
@@ -1571,7 +1571,8 @@ struct dentry *__d_alloc(struct super_block *sb, const struct qstr *name)
dentry->d_iname[DNAME_INLINE_LEN-1] = 0;
if (name->len > DNAME_INLINE_LEN-1) {
size_t size = offsetof(struct external_name, name[1]);
- struct external_name *p = kmalloc(size + name->len, GFP_KERNEL);
+ struct external_name *p = kmalloc(size + name->len,
+ GFP_KERNEL_ACCOUNT);
if (!p) {
kmem_cache_free(dentry_cache, dentry);
return NULL;
@@ -3415,7 +3416,7 @@ static void __init dcache_init(void)
* of the dcache.
*/
dentry_cache = KMEM_CACHE(dentry,
- SLAB_RECLAIM_ACCOUNT|SLAB_PANIC|SLAB_MEM_SPREAD);
+ SLAB_RECLAIM_ACCOUNT|SLAB_PANIC|SLAB_MEM_SPREAD|SLAB_ACCOUNT);
/* Hash may have been set up in dcache_init_early */
if (!hashdist)
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