Re: [PATCH] memcg: account security cred as well to kmemcg

[Andrew Morton]

On Thu,  5 Dec 2019 14:37:21 -0800 Shakeel Butt <shakeelb@xxxxxxxxxx> wrote:

> The cred_jar kmem_cache is already memcg accounted in the current
> kernel but cred->security is not. Account cred->security to kmemcg.
> 
> Recently we saw high root slab usage on our production and on further
> inspection, we found a buggy application leaking processes. Though that
> buggy application was contained within its memcg but we observe much
> more system memory overhead, couple of GiBs, during that period. This
> overhead can adversely impact the isolation on the system. One of source
> of high overhead, we found was cred->secuity objects.

A bit of an oversight and the fix is simple.  Is it worth a cc:stable?