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sched/numa: Stay on the same node if CLONE_VM

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A newly spawned thread inside a process should stay on the same
NUMA node as its parent. This prevents processes from being "torn"
across multiple NUMA nodes every time they spawn a new thread.

Signed-off-by: Rik van Riel <[email protected]>
Signed-off-by: Mel Gorman <[email protected]>
Cc: Andrea Arcangeli <[email protected]>
Cc: Johannes Weiner <[email protected]>
Cc: Srikar Dronamraju <[email protected]>
Signed-off-by: Peter Zijlstra <[email protected]>
Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Ingo Molnar <[email protected]>
This commit is contained in:
Rik van Riel 2013-10-07 11:29:26 +01:00 • committed by Ingo Molnar
commit 5e1576ed0e
3 changed files with 11 additions and 7 deletions
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14
kernel/sched/core.c
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@ -1696,7 +1696,7 @@ int wake_up_state(struct task_struct *p, unsigned int state)
*
* __sched_fork() is basic setup used by init_idle() too:
*/
static void __sched_fork(struct task_struct *p)
static void __sched_fork(unsigned long clone_flags, struct task_struct *p)
{
p->on_rq = 0;
@ -1725,11 +1725,15 @@ static void __sched_fork(struct task_struct *p)
p->mm->numa_scan_seq = 0;
}
if (clone_flags & CLONE_VM)
p->numa_preferred_nid = current->numa_preferred_nid;
else
p->numa_preferred_nid = -1;
p->node_stamp = 0ULL;
p->numa_scan_seq = p->mm ? p->mm->numa_scan_seq : 0;
p->numa_migrate_seq = 1;
p->numa_scan_period = sysctl_numa_balancing_scan_delay;
p->numa_preferred_nid = -1;
p->numa_work.next = &p->numa_work;
p->numa_faults = NULL;
p->numa_faults_buffer = NULL;
@ -1761,12 +1765,12 @@ void set_numabalancing_state(bool enabled)
/*
* fork()/clone()-time setup:
*/
void sched_fork(struct task_struct *p)
void sched_fork(unsigned long clone_flags, struct task_struct *p)
{
unsigned long flags;
int cpu = get_cpu();
__sched_fork(p);
__sched_fork(clone_flags, p);
/*
* We mark the process as running here. This guarantees that
* nobody will actually run it, and a signal or other external
@ -4287,7 +4291,7 @@ void init_idle(struct task_struct *idle, int cpu)
raw_spin_lock_irqsave(&rq->lock, flags);
__sched_fork(idle);
__sched_fork(0, idle);
idle->state = TASK_RUNNING;
idle->se.exec_start = sched_clock();