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SubjectRe: [PATCH] memcg: account security cred as well to kmemcg
On Fri, Dec 6, 2019 at 4:13 PM Andrew Morton <akpm@linux-foundation.org> wrote:
>
> On Thu, 5 Dec 2019 14:37:21 -0800 Shakeel Butt <shakeelb@google.com> 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?

Yes, I think it is simple and safe enough for stable.

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