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| author |   Heiko Carstens <hca@linux.ibm.com> | 2021-11-29 14:03:09 +0100 |
|---|---|---|
| committer |   Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2021-12-03 15:58:27 +0100 |
| commit | f1045056c726440469d89d23c13734bcd6c0d15b (patch) | |
| tree | f4b9b2b30a94baa1798cde9cb81c8e8d24862889 /Documentation/admin-guide/cputopology.rst | |
| parent | topology/sysfs: export cluster attributes only if an architectures has support (diff) | |
| download | wireguard-linux-f1045056c726440469d89d23c13734bcd6c0d15b.tar.xz wireguard-linux-f1045056c726440469d89d23c13734bcd6c0d15b.zip | |
topology/sysfs: rework book and drawer topology ifdefery
Provide default defines for the topology_book_[id|cpumask] and
topology_drawer_[id|cpumask] macros just like for each other topology
level.
This way all topology levels are handled in a similar way. Still the
the book and drawer levels are only used on s390, and also the sysfs
attributes are only created on s390. However other architectures may
opt in if wanted.
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
Link: https://lore.kernel.org/r/20211129130309.3256168-4-hca@linux.ibm.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'Documentation/admin-guide/cputopology.rst')
| -rw-r--r-- | Documentation/admin-guide/cputopology.rst | 36 |
1 files changed, 15 insertions, 21 deletions
diff --git a/Documentation/admin-guide/cputopology.rst b/Documentation/admin-guide/cputopology.rst index ad2238b41439..677ba1c2c820 100644 --- a/Documentation/admin-guide/cputopology.rst +++ b/Documentation/admin-guide/cputopology.rst @@ -8,14 +8,9 @@ to /proc/cpuinfo output of some architectures. They reside in Documentation/ABI/stable/sysfs-devices-system-cpu. Architecture-neutral, drivers/base/topology.c, exports these attributes. -However, the book and drawer related sysfs files will only be created if -CONFIG_SCHED_BOOK and CONFIG_SCHED_DRAWER are selected, respectively. - -The die and cluster hierarchy related sysfs files will only be created if an -architecture provides the related macros as described below. - -CONFIG_SCHED_BOOK and CONFIG_SCHED_DRAWER are currently only used on s390, -where they reflect the cpu and cache hierarchy. +However the die, cluster, book, and drawer hierarchy related sysfs files will +only be created if an architecture provides the related macros as described +below. For an architecture to support this feature, it must define some of these macros in include/asm-XXX/topology.h:: @@ -42,19 +37,18 @@ To be consistent on all architectures, include/linux/topology.h provides default definitions for any of the above macros that are not defined by include/asm-XXX/topology.h: -1) topology_physical_package_id: -1 -2) topology_die_id: -1 -3) topology_cluster_id: -1 -4) topology_core_id: 0 -5) topology_sibling_cpumask: just the given CPU -6) topology_core_cpumask: just the given CPU -7) topology_cluster_cpumask: just the given CPU -8) topology_die_cpumask: just the given CPU - -For architectures that don't support books (CONFIG_SCHED_BOOK) there are no -default definitions for topology_book_id() and topology_book_cpumask(). -For architectures that don't support drawers (CONFIG_SCHED_DRAWER) there are -no default definitions for topology_drawer_id() and topology_drawer_cpumask(). + 1) topology_physical_package_id: -1 + 2) topology_die_id: -1 + 3) topology_cluster_id: -1 + 4) topology_core_id: 0 + 5) topology_book_id: -1 + 6) topology_drawer_id: -1 + 7) topology_sibling_cpumask: just the given CPU + 8) topology_core_cpumask: just the given CPU + 9) topology_cluster_cpumask: just the given CPU +10) topology_die_cpumask: just the given CPU +11) topology_book_cpumask: just the given CPU +12) topology_drawer_cpumask: just the given CPU Additionally, CPU topology information is provided under /sys/devices/system/cpu and includes these files. The internal |