Re: [PATCH] kvm, mm: account kvm related kmem slabs to kmemcg

[Shakeel Butt <shakeelb@google.com>]

On Thu, Oct 5, 2017 at 9:28 PM, Anshuman Khandual
<khandual@linux.vnet.ibm.com> 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.

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