On Tue, Sep 20, 2022 at 02:06:33AM +0800, Kairui Song wrote: > From: Kairui Song <kasong@xxxxxxxxxxx> > > There are currently two helpers for checking if cgroup kmem > accounting is enabled: > > - mem_cgroup_kmem_disabled > - memcg_kmem_enabled > > mem_cgroup_kmem_disabled is a simple helper that returns true > if cgroup.memory=nokmem is specified, otherwise returns false. > > memcg_kmem_enabled is a bit different, it returns true if > cgroup.memory=nokmem is not specified and there was at least one > non-root memory control enabled cgroup ever created. This help improve > performance when kmem accounting was not actually activated. And it's > optimized with static branch. > > The usage of mem_cgroup_kmem_disabled is for sub-systems that need to > preallocate data for kmem accounting since they could be initialized > before kmem accounting is activated. But count_objcg_event doesn't > need that, so using memcg_kmem_enabled is better here. > > Signed-off-by: Kairui Song <kasong@xxxxxxxxxxx> Acked-by: Shakeel Butt <shakeelb@xxxxxxxxxx>
