xiaomi-sm8450/android_kernel_xiaomi_sm8450
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

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

Browse Source 
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
Download Patch File Download Diff File Expand all files Collapse all files

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:
*/