On Tue, Apr 26, 2022 at 09:43:43AM +0300, Vasily Averin wrote: > __register_pernet_operations() executes init hook of registered > pernet_operation structure in all existing net namespaces. > > Typically, these hooks are called by a process associated with > the specified net namespace, and all __GFP_ACCOUNT marked > allocation are accounted for corresponding container/memcg. > > However __register_pernet_operations() calls the hooks in the same > context, and as a result all marked allocations are accounted > to one memcg for all processed net namespaces. > > This patch adjusts active memcg for each net namespace and helps > to account memory allocated inside ops_init() into the proper memcg. > > Signed-off-by: Vasily Averin <vvs@xxxxxxxxxx> > --- > v4: get_mem_cgroup_from_kmem() renamed to get_mem_cgroup_from_obj(), > get_net_memcg() replaced by mem_cgroup_or_root(), suggested by Roman. > > v3: put_net_memcg() replaced by an alreay existing mem_cgroup_put() > It checks memcg before accessing it, this is required for > __register_pernet_operations() called before memcg initialization. > Additionally fixed leading whitespaces in non-memcg_kmem version > of mem_cgroup_from_obj(). > > v2: introduced get/put_net_memcg(), > new functions are moved under CONFIG_MEMCG_KMEM > to fix compilation issues reported by Intel's kernel test robot > > v1: introduced get_mem_cgroup_from_kmem(), which takes the refcount > for the found memcg, suggested by Shakeel > --- > include/linux/memcontrol.h | 27 ++++++++++++++++++++++++++- > net/core/net_namespace.c | 7 +++++++ > 2 files changed, 33 insertions(+), 1 deletion(-) Acked-by: Roman Gushchin <roman.gushchin@xxxxxxxxx> Thanks!
