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

[Roman Gushchin]

On Thu, Dec 05, 2019 at 02:37:21PM -0800, Shakeel Butt 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.
> 
> Signed-off-by: Shakeel Butt <shakeelb@xxxxxxxxxx>

Reviewed-by: Roman Gushchin <guro@xxxxxx>

Thanks!