diff options
author | Reinette Chatre <reinette.chatre@intel.com> | 2018-06-22 15:42:10 -0700 |
---|---|---|
committer | Thomas Gleixner <tglx@linutronix.de> | 2018-06-23 13:03:45 +0200 |
commit | f7a6e3f6f5ffa4926818ea2b3e8994ecef00b84f (patch) | |
tree | 3a321cc077b39b1e6ff0e590eba6be23d22333f0 /arch/x86/kernel/cpu/intel_rdt_rdtgroup.c | |
parent | 21220bb199f7d65c8f0a63ac7d3209e40fbdd706 (diff) |
x86/intel_rdt: Add utility to test if tasks assigned to resource group
In considering changes to a resource group it becomes necessary to know
whether tasks have been assigned to the resource group in question.
Introduce a new utility that can be used to check if any tasks have been
assigned to a particular resource group.
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/be9ea3969ffd731dfd90c0ebcd5a0e0a2d135bb2.1529706536.git.reinette.chatre@intel.com
Diffstat (limited to 'arch/x86/kernel/cpu/intel_rdt_rdtgroup.c')
-rw-r--r-- | arch/x86/kernel/cpu/intel_rdt_rdtgroup.c | 26 |
1 files changed, 26 insertions, 0 deletions
diff --git a/arch/x86/kernel/cpu/intel_rdt_rdtgroup.c b/arch/x86/kernel/cpu/intel_rdt_rdtgroup.c index 6eb716765a3f..59e1de9fe2d5 100644 --- a/arch/x86/kernel/cpu/intel_rdt_rdtgroup.c +++ b/arch/x86/kernel/cpu/intel_rdt_rdtgroup.c @@ -564,6 +564,32 @@ static int __rdtgroup_move_task(struct task_struct *tsk, return ret; } +/** + * rdtgroup_tasks_assigned - Test if tasks have been assigned to resource group + * @r: Resource group + * + * Return: 1 if tasks have been assigned to @r, 0 otherwise + */ +int rdtgroup_tasks_assigned(struct rdtgroup *r) +{ + struct task_struct *p, *t; + int ret = 0; + + lockdep_assert_held(&rdtgroup_mutex); + + rcu_read_lock(); + for_each_process_thread(p, t) { + if ((r->type == RDTCTRL_GROUP && t->closid == r->closid) || + (r->type == RDTMON_GROUP && t->rmid == r->mon.rmid)) { + ret = 1; + break; + } + } + rcu_read_unlock(); + + return ret; +} + static int rdtgroup_task_write_permission(struct task_struct *task, struct kernfs_open_file *of) { |