On Thu, Oct 5, 2017 at 9:28 PM, Anshuman Khandual <khandual@xxxxxxxxxxxxxxxxxx> wrote: > On 10/06/2017 06:37 AM, Shakeel Butt wrote: >> The kvm slabs can consume a significant amount of system memory >> and indeed in our production environment we have observed that >> a lot of machines are spending significant amount of memory that >> can not be left as system memory overhead. Also the allocations >> from these slabs can be triggered directly by user space applications >> which has access to kvm and thus a buggy application can leak >> such memory. So, these caches should be accounted to kmemcg. > > But there may be other situations like this where user space can > trigger allocation from various SLAB objects inside the kernel > which are accounted as system memory. So how we draw the line > which ones should be accounted for memcg. Just being curious. > Yes, there are indeed other slabs where user space can trigger allocations. IMO selecting which kmem caches to account is kind of workload and user specific decision. The ones I am converting are selected based on the data gathered from our production environment. However I think it would be useful in general.
