diff options
| author |   Gautham R. Shenoy <ego@linux.vnet.ibm.com> | 2020-04-07 14:17:43 +0530 |
|---|---|---|
| committer |   Michael Ellerman <mpe@ellerman.id.au> | 2020-04-30 12:35:27 +1000 |
| commit | bde752c3d6dbe9f6ca346560198e66bc3d7d7238 (patch) | |
| tree | 1c18ec1231d3c4ec72db98e9b2085b4cf861f76b /Documentation/ABI | |
| parent | powerpc/sysfs: Show idle_purr and idle_spurr for every CPU (diff) | |
| download | wireguard-linux-bde752c3d6dbe9f6ca346560198e66bc3d7d7238.tar.xz wireguard-linux-bde752c3d6dbe9f6ca346560198e66bc3d7d7238.zip | |
Documentation: Document sysfs interfaces purr, spurr, idle_purr, idle_spurr
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>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/1586249263-14048-6-git-send-email-ego@linux.vnet.ibm.com
Diffstat (limited to 'Documentation/ABI')
| -rw-r--r-- | Documentation/ABI/testing/sysfs-devices-system-cpu | 39 |
1 files changed, 39 insertions, 0 deletions
diff --git a/Documentation/ABI/testing/sysfs-devices-system-cpu b/Documentation/ABI/testing/sysfs-devices-system-cpu index 2e0e3b45d02a..b73b8b5c81f3 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: Apr 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: Apr 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. |