• Suraj Jitindar Singh's avatar
    KVM: Add provisioning for ulong vm stats and u64 vcpu stats · 8a7e75d4
    Suraj Jitindar Singh authored
    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: default avatarSuraj Jitindar Singh <sjitindarsingh@gmail.com>
    Reviewed-by: default avatarDavid Matlack <dmatlack@google.com>
    Acked-by: default avatarChristian Borntraeger <borntraeger@de.ibm.com>
    Signed-off-by: default avatarPaul Mackerras <paulus@ozlabs.org>
    8a7e75d4
kvm_host.h 12.9 KB