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Subject[PATCH 16/32] Documentation, ABI: Add a document entry for cache id
From: Fenghua Yu <>

Add an ABI document entry for /sys/devices/system/cpu/cpu*/cache/index*/id.

Signed-off-by: Fenghua Yu <>
Reviewed-by: Tony Luck <>
Acked-by: Borislav Petkov <>
Documentation/ABI/testing/sysfs-devices-system-cpu | 17 +++++++++++++++++
1 file changed, 17 insertions(+)

diff --git a/Documentation/ABI/testing/sysfs-devices-system-cpu b/Documentation/ABI/testing/sysfs-devices-system-cpu
index 1650133..ecd82e4 100644
--- a/Documentation/ABI/testing/sysfs-devices-system-cpu
+++ b/Documentation/ABI/testing/sysfs-devices-system-cpu
@@ -272,6 +272,23 @@ Description: Parameters for the CPU cache attributes
the modified cache line is written to main
memory only when it is replaced

+What: /sys/devices/system/cpu/cpu*/cache/index*/id
+Date: July 2016
+Contact: Linux kernel mailing list <>
+Description: Cache id
+ The id identifies a hardware cache of the system within a given
+ cache index in a set of cache indices. The "index" name is
+ simply a nomenclature from CPUID's leaf 4 which enumerates all
+ caches on the system by referring to each one as a cache index.
+ The (cache index, cache id) pair is unique for the whole
+ system.
+ Currently id is implemented on x86. On other platforms, id is
+ not enabled yet.
What: /sys/devices/system/cpu/cpuX/cpufreq/throttle_stats
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