On 7 October 2016 at 21:45, Fenghua Yu <fenghua...@intel.com> wrote: > From: Fenghua Yu <fenghua...@intel.com> > > Add an ABI document entry for /sys/devices/system/cpu/cpu*/cache/index*/id. > > Signed-off-by: Fenghua Yu <fenghua...@intel.com> > Signed-off-by: Tony Luck <tony.l...@intel.com> > --- > Documentation/ABI/testing/sysfs-devices-system-cpu | 16 ++++++++++++++++ > 1 file changed, 16 insertions(+) > > diff --git a/Documentation/ABI/testing/sysfs-devices-system-cpu > b/Documentation/ABI/testing/sysfs-devices-system-cpu > index 4987417..b1c3d69 100644 > --- 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 name 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 may not be 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, ... > +
While it is ok that the caches are not numbered contiguously, it is unclear how this is related to number of cores on a socket being a power of 2 or not. -- Nilay
