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Commit e29cf08b authored by Mel Gorman's avatar Mel Gorman Committed by Ingo Molnar
Browse files

sched/numa: Report a NUMA task group ID 



It is desirable to model from userspace how the scheduler groups tasks
over time. This patch adds an ID to the numa_group and reports it via
/proc/PID/status.

Signed-off-by: default avatarMel Gorman <mgorman@suse.de>
Reviewed-by: default avatarRik van Riel <riel@redhat.com>
Cc: Andrea Arcangeli <aarcange@redhat.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Srikar Dronamraju <srikar@linux.vnet.ibm.com>
Signed-off-by: default avatarPeter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/1381141781-10992-45-git-send-email-mgorman@suse.de


Signed-off-by: default avatarIngo Molnar <mingo@kernel.org>
parent 8c8a743c

fs/proc/array.c

+2 −0
Original line number Diff line number Diff line
@@ -183,6 +183,7 @@ static inline void task_state(struct seq_file *m, struct pid_namespace *ns, 
	seq_printf(m,

		"State:\t%s\n"

		"Tgid:\t%d\n"

		"Ngid:\t%d\n"

		"Pid:\t%d\n"

		"PPid:\t%d\n"

		"TracerPid:\t%d\n"
@@ -190,6 +191,7 @@ static inline void task_state(struct seq_file *m, struct pid_namespace *ns, 
		"Gid:\t%d\t%d\t%d\t%d\n",

		get_task_state(p),

		task_tgid_nr_ns(p, ns),

		task_numa_group_id(p),

		pid_nr_ns(pid, ns),

		ppid, tpid,

		from_kuid_munged(user_ns, cred->uid),

include/linux/sched.h

+5 −0
Original line number Diff line number Diff line
@@ -1452,12 +1452,17 @@ struct task_struct { 


#ifdef CONFIG_NUMA_BALANCING

extern void task_numa_fault(int last_node, int node, int pages, bool migrated);

extern pid_t task_numa_group_id(struct task_struct *p);

extern void set_numabalancing_state(bool enabled);

#else

static inline void task_numa_fault(int last_node, int node, int pages,

				   bool migrated)

{

}

static inline pid_t task_numa_group_id(struct task_struct *p)

{

	return 0;

}

static inline void set_numabalancing_state(bool enabled)

{

}

kernel/sched/fair.c

+7 −0
Original line number Diff line number Diff line
@@ -893,12 +893,18 @@ struct numa_group { 


	spinlock_t lock; /* nr_tasks, tasks */

	int nr_tasks;

	pid_t gid;

	struct list_head task_list;



	struct rcu_head rcu;

	atomic_long_t faults[0];

};



pid_t task_numa_group_id(struct task_struct *p)

{

	return p->numa_group ? p->numa_group->gid : 0;

}



static inline int task_faults_idx(int nid, int priv)

{

	return 2 * nid + priv;
@@ -1265,6 +1271,7 @@ static void task_numa_group(struct task_struct *p, int cpupid) 
		atomic_set(&grp->refcount, 1);

		spin_lock_init(&grp->lock);

		INIT_LIST_HEAD(&grp->task_list);

		grp->gid = p->pid;



		for (i = 0; i < 2*nr_node_ids; i++)

			atomic_long_set(&grp->faults[i], p->numa_faults[i]);