Documentation, ABI: Document the new sysfs files for cpu cache ids

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

Signed-off-by: Tony Luck <tony.luck@intel.com>
Signed-off-by: Fenghua Yu <fenghua.yu@intel.com>
Cc: "Ravi V Shankar" <ravi.v.shankar@intel.com>
Cc: "David Carrillo-Cisneros" <davidcc@google.com>
Cc: "Sai Prakhya" <sai.praneeth.prakhya@intel.com>
Cc: "Peter Zijlstra" <peterz@infradead.org>
Cc: "Stephane Eranian" <eranian@google.com>
Cc: "Dave Hansen" <dave.hansen@intel.com>
Cc: "Shaohua Li" <shli@fb.com>
Cc: "Nilay Vaish" <nilayvaish@gmail.com>
Cc: "Vikas Shivappa" <vikas.shivappa@linux.intel.com>
Cc: "Ingo Molnar" <mingo@elte.hu>
Cc: "Borislav Petkov" <bp@suse.de>
Cc: "H. Peter Anvin" <h.peter.anvin@intel.com>
Link: http://lkml.kernel.org/r/1477142405-32078-2-git-send-email-fenghua.yu@intel.com
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

diff --git a/Documentation/ABI/testing/sysfs-devices-system-cpu b/Documentation/ABI/testing/sysfs-devices-system-cpu
index 4987417..2a4a423 100644 (file)
--- a/Documentation/ABI/testing/sysfs-devices-system-cpu
+++ b/Documentation/ABI/testing/sysfs-devices-system-cpu
@@ -272,6 +272,22 @@ 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:          September 2016
+Contact:       Linux kernel mailing list <linux-kernel@vger.kernel.org>
+Description:   Cache id
+
+               The id provides a unique number for a specific instance of
+               a cache of a particular type. E.g. there may be a level
+               3 unified cache on each socket in a server and we may
+               assign them ids 0, 1, 2, ...
+
+               Note that id value can be non-contiguous. E.g. level 1
+               caches typically exist per core, but there may not be a
+               power of two cores on a socket, so these caches may be
+               numbered 0, 1, 2, 3, 4, 5, 8, 9, 10, ...
+
 What:          /sys/devices/system/cpu/cpuX/cpufreq/throttle_stats
                /sys/devices/system/cpu/cpuX/cpufreq/throttle_stats/turbo_stat
                /sys/devices/system/cpu/cpuX/cpufreq/throttle_stats/sub_turbo_stat