On Thu, Sep 05, 2019 at 02:45:44PM -0700, Roman Gushchin <guro@xxxxxx> wrote: > Roman Gushchin (14): > [...] > mm: memcg/slab: use one set of kmem_caches for all memory cgroups From that commit's message: > 6) obsoletes kmem.slabinfo cgroup v1 interface file, as there are > no per-memcg kmem_caches anymore (empty output is printed) The empty file means no allocations took place in the particular cgroup. I find this quite a surprising change for consumers of these stats. I understand obtaining the same data efficiently from the proposed structures is difficult, however, such a change should be avoided. (In my understanding, obsoleted file ~ not available in v2, however, it should not disappear from v1.) Michal
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