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A VCPU of a VM can allocate couple of pages which can be mmap'ed by the user space application. At the moment this memory is not charged to the memcg of the VMM. On a large machine running large number of VMs or small number of VMs having large number of VCPUs, this unaccounted memory can be very significant. So, charge this memory to the memcg of the VMM. Please note that lifetime of these allocations corresponds to the lifetime of the VMM. Link: https://lkml.kernel.org/r/20201106202923.2087414-1-shakeelb@google.com Signed-off-by: Shakeel Butt <shakeelb@google.com> Acked-by: Roman Gushchin <guro@fb.com> Acked-by: Paolo Bonzini <pbonzini@redhat.com> Cc: Johannes Weiner <hannes@cmpxchg.org> Cc: Michal Hocko <mhocko@suse.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org> |
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