diff options
Diffstat (limited to 'Documentation/ABI/testing/sysfs-devices-system-cpu')
| -rw-r--r-- | Documentation/ABI/testing/sysfs-devices-system-cpu | 32 |
1 files changed, 26 insertions, 6 deletions
diff --git a/Documentation/ABI/testing/sysfs-devices-system-cpu b/Documentation/ABI/testing/sysfs-devices-system-cpu index 9605dbd4b5b5..1528239f69b2 100644 --- a/Documentation/ABI/testing/sysfs-devices-system-cpu +++ b/Documentation/ABI/testing/sysfs-devices-system-cpu @@ -484,6 +484,7 @@ What: /sys/devices/system/cpu/vulnerabilities /sys/devices/system/cpu/vulnerabilities/spectre_v2 /sys/devices/system/cpu/vulnerabilities/spec_store_bypass /sys/devices/system/cpu/vulnerabilities/l1tf + /sys/devices/system/cpu/vulnerabilities/mds Date: January 2018 Contact: Linux kernel mailing list <linux-kernel@vger.kernel.org> Description: Information about CPU vulnerabilities @@ -496,8 +497,7 @@ Description: Information about CPU vulnerabilities "Vulnerable" CPU is affected and no mitigation in effect "Mitigation: $M" CPU is affected and mitigation $M is in effect - Details about the l1tf file can be found in - Documentation/admin-guide/l1tf.rst + See also: Documentation/admin-guide/hw-vuln/index.rst What: /sys/devices/system/cpu/smt /sys/devices/system/cpu/smt/active @@ -511,10 +511,30 @@ Description: Control Symetric Multi Threading (SMT) control: Read/write interface to control SMT. Possible values: - "on" SMT is enabled - "off" SMT is disabled - "forceoff" SMT is force disabled. Cannot be changed. - "notsupported" SMT is not supported by the CPU + "on" SMT is enabled + "off" SMT is disabled + "forceoff" SMT is force disabled. Cannot be changed. + "notsupported" SMT is not supported by the CPU + "notimplemented" SMT runtime toggling is not + implemented for the architecture If control status is "forceoff" or "notsupported" writes are rejected. + +What: /sys/devices/system/cpu/cpu#/power/energy_perf_bias +Date: March 2019 +Contact: linux-pm@vger.kernel.org +Description: Intel Energy and Performance Bias Hint (EPB) + + EPB for the given CPU in a sliding scale 0 - 15, where a value + of 0 corresponds to a hint preference for highest performance + and a value of 15 corresponds to the maximum energy savings. + + In order to change the EPB value for the CPU, write either + a number in the 0 - 15 sliding scale above, or one of the + strings: "performance", "balance-performance", "normal", + "balance-power", "power" (that represent values reflected by + their meaning), to this attribute. + + This attribute is present for all online CPUs supporting the + Intel EPB feature. |