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Commit f7a6e3f6 authored by Reinette Chatre's avatar Reinette Chatre Committed by Thomas Gleixner
Browse files

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: default avatarReinette Chatre <reinette.chatre@intel.com>
Signed-off-by: default avatarThomas 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
parent 21220bb1

arch/x86/kernel/cpu/intel_rdt.h

+1 −0
Original line number Diff line number Diff line
@@ -480,6 +480,7 @@ bool rdtgroup_cbm_overlaps(struct rdt_resource *r, struct rdt_domain *d, 
unsigned int rdtgroup_cbm_to_size(struct rdt_resource *r, struct rdt_domain *d,

				  u32 cbm);

enum rdtgrp_mode rdtgroup_mode_by_closid(int closid);

int rdtgroup_tasks_assigned(struct rdtgroup *r);

struct rdt_domain *get_domain_from_cpu(int cpu, struct rdt_resource *r);

int update_domains(struct rdt_resource *r, int closid);

void closid_free(int closid);

arch/x86/kernel/cpu/intel_rdt_rdtgroup.c

+26 −0
Original line number Diff line number Diff line
@@ -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)

{