Shakeel Butt writes:
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.
Makes sense. I took a look through other cred-related allocations to see if any others stood out and this looks like it covers all the relevant cases. __alloc_file is the only other one that caught my eye, but SLAB_ACCOUNT is on the filp cache already.
Thanks :-)
Signed-off-by: Shakeel Butt <shakeelb@xxxxxxxxxx>
Acked-by: Chris Down <chris@xxxxxxxxxxxxxx>
