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| author | Len Brown <len.brown@intel.com> | 2019-05-13 13:58:55 -0400 |
|---|---|---|
| committer | Thomas Gleixner <tglx@linutronix.de> | 2019-05-23 10:08:34 +0200 |
| commit | b73ed8dc0597c11ec5064d06b9bbd4e541b6d4e7 (patch) | |
| tree | 2945751e5a2c5b472ce3caaaad132fa92d2d5a99 /drivers/base/topology.c | |
| parent | cfcd82e632882372db960b50782a439a8ba56c09 (diff) | |
| download | lwn-b73ed8dc0597c11ec5064d06b9bbd4e541b6d4e7.tar.gz lwn-b73ed8dc0597c11ec5064d06b9bbd4e541b6d4e7.zip | |
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
Diffstat (limited to 'drivers/base/topology.c')
| -rw-r--r-- | drivers/base/topology.c | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/drivers/base/topology.c b/drivers/base/topology.c index 50352cf96f85..dc3c19b482f3 100644 --- a/drivers/base/topology.c +++ b/drivers/base/topology.c @@ -57,6 +57,10 @@ define_siblings_show_func(core_siblings, core_cpumask); static DEVICE_ATTR_RO(core_siblings); static DEVICE_ATTR_RO(core_siblings_list); +define_siblings_show_func(package_cpus, core_cpumask); +static DEVICE_ATTR_RO(package_cpus); +static DEVICE_ATTR_RO(package_cpus_list); + #ifdef CONFIG_SCHED_BOOK define_id_show_func(book_id); static DEVICE_ATTR_RO(book_id); @@ -81,6 +85,8 @@ static struct attribute *default_attrs[] = { &dev_attr_thread_siblings_list.attr, &dev_attr_core_siblings.attr, &dev_attr_core_siblings_list.attr, + &dev_attr_package_cpus.attr, + &dev_attr_package_cpus_list.attr, #ifdef CONFIG_SCHED_BOOK &dev_attr_book_id.attr, &dev_attr_book_siblings.attr, |