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topology: Create package_cpus sysfs attribute
The existing sysfs cpu/topology/core_siblings (and core_siblings_list) attributes are documented, implemented, and used by programs to represent set of logical CPUs sharing the same package. This makes sense if the next topology level above a core is always a package. But on systems where there is a die topology level between a core and a package, the name and its definition become inconsistent. So without changing its function, add a name for this map that describes what it actually is -- package CPUs -- the set of CPUs that share the same package. This new name will be immune to changes in topology, since it describes threads at the current level, not siblings at a contained level. Suggested-by: Brice Goglin <Brice.Goglin@inria.fr> Signed-off-by: Len Brown <len.brown@intel.com> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Ingo Molnar <mingo@kernel.org> Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org> Link: https://lkml.kernel.org/r/d9d3228b82fb5665e6f93a0ccd033fe022558521.1557769318.git.len.brown@intel.com
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2 changed files with 12 additions and 6 deletions
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@ -46,15 +46,15 @@ thread_siblings_list:
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human-readable list of cpuX's hardware threads within the same
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core as cpuX.
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core_siblings:
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package_cpus:
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internal kernel map of cpuX's hardware threads within the same
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physical_package_id.
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internal kernel map of the CPUs sharing the same physical_package_id.
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(deprecated name: "core_siblings")
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core_siblings_list:
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package_cpus_list:
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human-readable list of cpuX's hardware threads within the same
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physical_package_id.
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human-readable list of CPUs sharing the same physical_package_id.
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(deprecated name: "core_siblings_list")
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book_siblings:
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@ -57,6 +57,10 @@ define_siblings_show_func(core_siblings, core_cpumask);
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static DEVICE_ATTR_RO(core_siblings);
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static DEVICE_ATTR_RO(core_siblings_list);
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define_siblings_show_func(package_cpus, core_cpumask);
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static DEVICE_ATTR_RO(package_cpus);
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static DEVICE_ATTR_RO(package_cpus_list);
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#ifdef CONFIG_SCHED_BOOK
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define_id_show_func(book_id);
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static DEVICE_ATTR_RO(book_id);
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@ -81,6 +85,8 @@ static struct attribute *default_attrs[] = {
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&dev_attr_thread_siblings_list.attr,
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&dev_attr_core_siblings.attr,
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&dev_attr_core_siblings_list.attr,
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&dev_attr_package_cpus.attr,
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&dev_attr_package_cpus_list.attr,
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#ifdef CONFIG_SCHED_BOOK
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&dev_attr_book_id.attr,
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&dev_attr_book_siblings.attr,
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