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    SubjectRe: [PATCH v4 5/6] Documentation: Document sysfs interfaces purr, spurr, idle_purr, idle_spurr
    Gautham R. Shenoy wrote:
    > From: "Gautham R. Shenoy" <ego@linux.vnet.ibm.com>
    >
    > Add documentation for the following sysfs interfaces:
    > /sys/devices/system/cpu/cpuX/purr
    > /sys/devices/system/cpu/cpuX/spurr
    > /sys/devices/system/cpu/cpuX/idle_purr
    > /sys/devices/system/cpu/cpuX/idle_spurr
    >
    > Signed-off-by: Gautham R. Shenoy <ego@linux.vnet.ibm.com>
    > ---
    > Documentation/ABI/testing/sysfs-devices-system-cpu | 39 ++++++++++++++++++++++
    > 1 file changed, 39 insertions(+)
    >
    > diff --git a/Documentation/ABI/testing/sysfs-devices-system-cpu b/Documentation/ABI/testing/sysfs-devices-system-cpu
    > index 2e0e3b4..bc07677 100644
    > --- a/Documentation/ABI/testing/sysfs-devices-system-cpu
    > +++ b/Documentation/ABI/testing/sysfs-devices-system-cpu
    > @@ -580,3 +580,42 @@ Description: Secure Virtual Machine
    > If 1, it means the system is using the Protected Execution
    > Facility in POWER9 and newer processors. i.e., it is a Secure
    > Virtual Machine.
    > +
    > +What: /sys/devices/system/cpu/cpuX/purr
    > +Date: Apr 2005
    > +Contact: Linux for PowerPC mailing list <linuxppc-dev@ozlabs.org>
    > +Description: PURR ticks for this CPU since the system boot.
    > +
    > + The Processor Utilization Resources Register (PURR) is
    > + a 64-bit counter which provides an estimate of the
    > + resources used by the CPU thread. The contents of this
    > + register increases monotonically. This sysfs interface
    > + exposes the number of PURR ticks for cpuX.
    > +
    > +What: /sys/devices/system/cpu/cpuX/spurr
    > +Date: Dec 2006
    > +Contact: Linux for PowerPC mailing list <linuxppc-dev@ozlabs.org>
    > +Description: SPURR ticks for this CPU since the system boot.
    > +
    > + The Scaled Processor Utilization Resources Register
    > + (SPURR) is a 64-bit counter that provides a frequency
    > + invariant estimate of the resources used by the CPU
    > + thread. The contents of this register increases
    > + monotonically. This sysfs interface exposes the number
    > + of SPURR ticks for cpuX.
    > +
    > +What: /sys/devices/system/cpu/cpuX/idle_purr
    > +Date: Mar 2020
    > +Contact: Linux for PowerPC mailing list <linuxppc-dev@ozlabs.org>
    > +Description: PURR ticks for cpuX when it was idle.
    > +
    > + This sysfs interface exposes the number of PURR ticks
    > + for cpuX when it was idle.
    > +
    > +What: /sys/devices/system/cpu/cpuX/idle_spurr
    > +Date: Mar 2020
    > +Contact: Linux for PowerPC mailing list <linuxppc-dev@ozlabs.org>
    > +Description: SPURR ticks for cpuX when it was idle.
    > +
    > + This sysfs interface exposes the number of SPURR ticks
    > + for cpuX when it was idle.

    Apart from the minor comment on patches 2 and 3, from the sysfs
    interface standpoint, for patches 1 to 5:
    Acked-by: Naveen N. Rao <naveen.n.rao@linux.vnet.ibm.com>

    - Naveen

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