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SubjectRe: [PATCH RFC 00/14] The new slab memory controller
On Thu, Sep 05, 2019 at 02:45:44PM -0700, Roman Gushchin <guro@fb.com> 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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