500fe5f550
Currently on POWER9 SMT8 cores systems, in sysfs, we report the shared_cache_map for L1 caches (both data and instruction) to be the cpu-ids of the threads in SMT8 cores. This is incorrect since on POWER9 SMT8 cores there are two groups of threads, each of which shares its own L1 cache. This patch addresses this by reporting the shared_cpu_map correctly in sysfs for L1 caches. Before the patch /sys/devices/system/cpu/cpu0/cache/index0/shared_cpu_map : 000000ff /sys/devices/system/cpu/cpu0/cache/index1/shared_cpu_map : 000000ff /sys/devices/system/cpu/cpu1/cache/index0/shared_cpu_map : 000000ff /sys/devices/system/cpu/cpu1/cache/index1/shared_cpu_map : 000000ff After the patch /sys/devices/system/cpu/cpu0/cache/index0/shared_cpu_map : 00000055 /sys/devices/system/cpu/cpu0/cache/index1/shared_cpu_map : 00000055 /sys/devices/system/cpu/cpu1/cache/index0/shared_cpu_map : 000000aa /sys/devices/system/cpu/cpu1/cache/index1/shared_cpu_map : 000000aa Signed-off-by: Gautham R. Shenoy <ego@linux.vnet.ibm.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
See Documentation/00-INDEX for a list of what is contained in each file.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.