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sched/numa: Report a NUMA task group ID

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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: Mel Gorman <mgorman@suse.de>
Reviewed-by: Rik 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: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/1381141781-10992-45-git-send-email-mgorman@suse.de
Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Mel Gorman
2013-10-07 11:29:22 +01:00
committed by Ingo Molnar
parent 8c8a743c50
commit e29cf08b05
3 changed files with 14 additions and 0 deletions
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7
kernel/sched/fair.c
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@@ -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]);