On 07/19/2016 10:12 AM, Suraj Jitindar Singh wrote: > vms and vcpus have statistics associated with them which can be viewed > within the debugfs. Currently it is assumed within the vcpu_stat_get() and > vm_stat_get() functions that all of these statistics are represented as > u32s, however the next patch adds some u64 vcpu statistics. > > Change all vcpu statistics to u64 and modify vcpu_stat_get() accordingly. > Since vcpu statistics are per vcpu, they will only be updated by a single > vcpu at a time so this shouldn't present a problem on 32-bit machines > which can't atomically increment 64-bit numbers. However vm statistics > could potentially be updated by multiple vcpus from that vm at a time. > To avoid the overhead of atomics make all vm statistics ulong such that > they are 64-bit on 64-bit systems where they can be atomically incremented > and are 32-bit on 32-bit systems which may not be able to atomically > increment 64-bit numbers. Modify vm_stat_get() to expect ulongs. > > Signed-off-by: Suraj Jitindar Singh <sjitindarsingh@xxxxxxxxx> Acked-by: Christian Borntraeger <borntraeger@xxxxxxxxxx> -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
