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authorReinette Chatre <reinette.chatre@intel.com>2018-07-01 07:17:33 +0200
committerThomas Gleixner <tglx@linutronix.de>2018-07-03 08:38:40 +0200
commit33dc3e410a0d99f394905143b26d34f1fd64c962 (patch)
treeb09468f8123e257842860e657d6d2b7417681bc6 /Documentation/x86
parentx86/intel_rdt: Support restoration of subset of permissions (diff)
downloadlinux-33dc3e410a0d99f394905143b26d34f1fd64c962.tar.xz
linux-33dc3e410a0d99f394905143b26d34f1fd64c962.zip
x86/intel_rdt: Make CPU information accessible for pseudo-locked regions
When a resource group enters pseudo-locksetup mode it reflects that the platform supports cache pseudo-locking and the resource group is unused, ready to be used for a pseudo-locked region. Until it is set up as a pseudo-locked region the resource group is "locked down" such that no new tasks or cpus can be assigned to it. This is accomplished in a user visible way by making the cpus, cpus_list, and tasks resctrl files inaccassible (user cannot read from or write to these files). When the resource group changes to pseudo-locked mode it represents a cache pseudo-locked region. While not appropriate to make any changes to the cpus assigned to this region it is useful to make it easy for the user to see which cpus are associated with the pseudo-locked region. Modify the permissions of the cpus/cpus_list file when the resource group changes to pseudo-locked mode to support reading (not writing). The information presented to the user when reading the file are the cpus associated with the pseudo-locked region. Signed-off-by: Reinette Chatre <reinette.chatre@intel.com> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Cc: fenghua.yu@intel.com Cc: tony.luck@intel.com Cc: vikas.shivappa@linux.intel.com Cc: gavin.hindman@intel.com Cc: jithu.joseph@intel.com Cc: dave.hansen@intel.com Cc: hpa@zytor.com Link: https://lkml.kernel.org/r/12756b7963b6abc1bffe8fb560b87b75da827bd1.1530421961.git.reinette.chatre@intel.com
Diffstat (limited to 'Documentation/x86')
-rw-r--r--Documentation/x86/intel_rdt_ui.txt3
1 files changed, 3 insertions, 0 deletions
diff --git a/Documentation/x86/intel_rdt_ui.txt b/Documentation/x86/intel_rdt_ui.txt
index acac30b67c62..f662d3c530e5 100644
--- a/Documentation/x86/intel_rdt_ui.txt
+++ b/Documentation/x86/intel_rdt_ui.txt
@@ -178,6 +178,9 @@ All groups contain the following files:
CPUs to/from this group. As with the tasks file a hierarchy is
maintained where MON groups may only include CPUs owned by the
parent CTRL_MON group.
+ When the resouce group is in pseudo-locked mode this file will
+ only be readable, reflecting the CPUs associated with the
+ pseudo-locked region.
"cpus_list":