[PATCH 0/2] x86/intel_rdt: Display CPUs associated with pseudo-locked region
Dear Maintainers, The cpus and cpus_list resctrl files are locked down when the resource group enters pseudo-locksetup mode and remains locked down when the resource group transitions to pseudo-locked mode. This was done to ensure a resource group in pseudo-locksetup mode is and remain unused until it transitions to pseudo-locked mode. With this series read (but not write) access is restored to the cpus and cpus_list files after a resource group enters pseudo-locked mode. The information displayed is also adjusted appropriately. It is now possible for users to view which cpus are associated with a pseudo-locked region through the existing cpus and cpus_list resctrl files. Only the tasks file remains locked down. For example: # mount -t resctrl resctrl /sys/fs/resctrl # cd /sys/fs/resctrl # echo 'L2:1=0xfc' > schemata # mkdir p1 # ls -l p1/cpus* p1/tasks -rw-r--r-- 1 root root 0 Jun 30 06:30 p1/cpus -rw-r--r-- 1 root root 0 Jun 30 06:30 p1/cpus_list -rw-r--r-- 1 root root 0 Jun 30 06:30 p1/tasks # echo pseudo-locksetup > p1/mode # ls -l p1/cpus* p1/tasks -- 1 root root 0 Jun 30 06:30 p1/cpus -- 1 root root 0 Jun 30 06:30 p1/cpus_list -- 1 root root 0 Jun 30 06:30 p1/tasks # echo 'L2:1=0x3' > p1/schemata # ls -l p1/cpus* p1/tasks -r--r--r-- 1 root root 0 Jun 30 06:30 p1/cpus -r--r--r-- 1 root root 0 Jun 30 06:30 p1/cpus_list -- 1 root root 0 Jun 30 06:30 p1/tasks # grep . p1/* p1/cpus:c p1/cpus_list:2-3 p1/mode:pseudo-locked p1/schemata:L2:1=3 p1/size:L2:1=262144 grep: p1/tasks: Permission denied Reinette Chatre (2): x86/intel_rdt: Support restoration of subset of permissions x86/intel_rdt: cpu information accessible for pseudo-locked regions Documentation/x86/intel_rdt_ui.txt | 3 +++ arch/x86/kernel/cpu/intel_rdt.h | 3 ++- arch/x86/kernel/cpu/intel_rdt_pseudo_lock.c | 17 ++--- arch/x86/kernel/cpu/intel_rdt_rdtgroup.c| 14 ++ 4 files changed, 25 insertions(+), 12 deletions(-) -- 2.17.0
[PATCH 0/2] x86/intel_rdt: Display CPUs associated with pseudo-locked region
Dear Maintainers, The cpus and cpus_list resctrl files are locked down when the resource group enters pseudo-locksetup mode and remains locked down when the resource group transitions to pseudo-locked mode. This was done to ensure a resource group in pseudo-locksetup mode is and remain unused until it transitions to pseudo-locked mode. With this series read (but not write) access is restored to the cpus and cpus_list files after a resource group enters pseudo-locked mode. The information displayed is also adjusted appropriately. It is now possible for users to view which cpus are associated with a pseudo-locked region through the existing cpus and cpus_list resctrl files. Only the tasks file remains locked down. For example: # mount -t resctrl resctrl /sys/fs/resctrl # cd /sys/fs/resctrl # echo 'L2:1=0xfc' > schemata # mkdir p1 # ls -l p1/cpus* p1/tasks -rw-r--r-- 1 root root 0 Jun 30 06:30 p1/cpus -rw-r--r-- 1 root root 0 Jun 30 06:30 p1/cpus_list -rw-r--r-- 1 root root 0 Jun 30 06:30 p1/tasks # echo pseudo-locksetup > p1/mode # ls -l p1/cpus* p1/tasks -- 1 root root 0 Jun 30 06:30 p1/cpus -- 1 root root 0 Jun 30 06:30 p1/cpus_list -- 1 root root 0 Jun 30 06:30 p1/tasks # echo 'L2:1=0x3' > p1/schemata # ls -l p1/cpus* p1/tasks -r--r--r-- 1 root root 0 Jun 30 06:30 p1/cpus -r--r--r-- 1 root root 0 Jun 30 06:30 p1/cpus_list -- 1 root root 0 Jun 30 06:30 p1/tasks # grep . p1/* p1/cpus:c p1/cpus_list:2-3 p1/mode:pseudo-locked p1/schemata:L2:1=3 p1/size:L2:1=262144 grep: p1/tasks: Permission denied Reinette Chatre (2): x86/intel_rdt: Support restoration of subset of permissions x86/intel_rdt: cpu information accessible for pseudo-locked regions Documentation/x86/intel_rdt_ui.txt | 3 +++ arch/x86/kernel/cpu/intel_rdt.h | 3 ++- arch/x86/kernel/cpu/intel_rdt_pseudo_lock.c | 17 ++--- arch/x86/kernel/cpu/intel_rdt_rdtgroup.c| 14 ++ 4 files changed, 25 insertions(+), 12 deletions(-) -- 2.17.0
