lists.openwall.net | lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC | |
Open Source and information security mailing list archives
| ||
|
Date: Mon, 30 May 2022 14:26:00 +0300 From: Vasily Averin <vvs@...nvz.org> To: Andrew Morton <akpm@...ux-foundation.org> Cc: kernel@...nvz.org, linux-kernel@...r.kernel.org, linux-mm@...ck.org, Shakeel Butt <shakeelb@...gle.com>, Roman Gushchin <roman.gushchin@...ux.dev>, Michal Koutný <mkoutny@...e.com>, Vlastimil Babka <vbabka@...e.cz>, Michal Hocko <mhocko@...e.com>, Muchun Song <songmuchun@...edance.com>, cgroups@...r.kernel.org Subject: [PATCH mm v3 2/9] memcg: enable accounting for kernfs nodes kernfs nodes are quite small kernel objects, however there are few scenarios where it consumes significant piece of all allocated memory: 1) creating a new netdevice allocates ~50Kb of memory, where ~10Kb was allocated for 80+ kernfs nodes. 2) cgroupv2 mkdir allocates ~60Kb of memory, ~10Kb of them are kernfs structures. 3) Shakeel Butt reports that Google has workloads which create 100s of subcontainers and they have observed high system overhead without memcg accounting of kernfs. Usually new kernfs node creates few other objects: Allocs Alloc Allocation number size -------------------------------------------- 1 + 128 (__kernfs_new_node+0x4d) kernfs node 1 + 88 (__kernfs_iattrs+0x57) kernfs iattrs 1 + 96 (simple_xattr_alloc+0x28) simple_xattr, can grow over 4Kb 1 32 (simple_xattr_set+0x59) 1 8 (__kernfs_new_node+0x30) '+' -- to be accounted This patch enables accounting for kernfs nodes slab cache. Signed-off-by: Vasily Averin <vvs@...nvz.org> Reviewed-by: Roman Gushchin <roman.gushchin@...ux.dev> Reviewed-by: Michal Koutný <mkoutny@...e.com> Acked-by: Shakeel Butt <shakeelb@...gle.com> Reviewed-by: Muchun Song <songmuchun@...edance.com> --- fs/kernfs/mount.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/fs/kernfs/mount.c b/fs/kernfs/mount.c index cfa79715fc1a..3ac4191b1c40 100644 --- a/fs/kernfs/mount.c +++ b/fs/kernfs/mount.c @@ -391,7 +391,8 @@ void __init kernfs_init(void) { kernfs_node_cache = kmem_cache_create("kernfs_node_cache", sizeof(struct kernfs_node), - 0, SLAB_PANIC, NULL); + 0, SLAB_PANIC | SLAB_ACCOUNT, + NULL); /* Creates slab cache for kernfs inode attributes */ kernfs_iattrs_cache = kmem_cache_create("kernfs_iattrs_cache", -- 2.36.1
Powered by blists - more mailing lists