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mm: sched: numa: Control enabling and disabling of NUMA balancing

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This patch adds Kconfig options and kernel parameters to allow the
enabling and disabling of automatic NUMA balancing. The existance
of such a switch was and is very important when debugging problems
related to transparent hugepages and we should have the same for
automatic NUMA placement.

Signed-off-by: Mel Gorman <mgorman@suse.de>
This commit is contained in:
Mel Gorman
2012-11-22 11:16:36 +00:00
parent b8593bfda1
commit 1a687c2e9a
7 changed files with 101 additions and 17 deletions
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48
kernel/sched/core.c
View File

@@ -192,23 +192,10 @@ static void sched_feat_disable(int i) { };
static void sched_feat_enable(int i) { };
#endif /* HAVE_JUMP_LABEL */
static ssize_t
sched_feat_write(struct file *filp, const char __user *ubuf,
size_t cnt, loff_t *ppos)
static int sched_feat_set(char *cmp)
{
char buf[64];
char *cmp;
int neg = 0;
int i;
if (cnt > 63)
cnt = 63;
if (copy_from_user(&buf, ubuf, cnt))
return -EFAULT;
buf[cnt] = 0;
cmp = strstrip(buf);
int neg = 0;
if (strncmp(cmp, "NO_", 3) == 0) {
neg = 1;
@@ -228,6 +215,27 @@ sched_feat_write(struct file *filp, const char __user *ubuf,
}
}
return i;
}
static ssize_t
sched_feat_write(struct file *filp, const char __user *ubuf,
size_t cnt, loff_t *ppos)
{
char buf[64];
char *cmp;
int i;
if (cnt > 63)
cnt = 63;
if (copy_from_user(&buf, ubuf, cnt))
return -EFAULT;
buf[cnt] = 0;
cmp = strstrip(buf);
i = sched_feat_set(cmp);
if (i == __SCHED_FEAT_NR)
return -EINVAL;
@@ -1549,6 +1557,16 @@ static void __sched_fork(struct task_struct *p)
#endif /* CONFIG_NUMA_BALANCING */
}
#ifdef CONFIG_NUMA_BALANCING
void set_numabalancing_state(bool enabled)
{
if (enabled)
sched_feat_set("NUMA");
else
sched_feat_set("NO_NUMA");
}
#endif /* CONFIG_NUMA_BALANCING */
/*
* fork()/clone()-time setup:
*/

3
kernel/sched/fair.c
View File

@@ -811,6 +811,9 @@ void task_numa_fault(int node, int pages, bool migrated)
{
struct task_struct *p = current;
if (!sched_feat_numa(NUMA))
return;
/* FIXME: Allocate task-specific structure for placement policy here */
/*

6
kernel/sched/features.h
View File

@@ -63,8 +63,10 @@ SCHED_FEAT(RT_RUNTIME_SHARE, true)
SCHED_FEAT(LB_MIN, false)
/*
* Apply the automatic NUMA scheduling policy
* Apply the automatic NUMA scheduling policy. Enabled automatically
* at runtime if running on a NUMA machine. Can be controlled via
* numa_balancing=
*/
#ifdef CONFIG_NUMA_BALANCING
SCHED_FEAT(NUMA, true)
SCHED_FEAT(NUMA, false)
#endif