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sched: Use jump_labels for sched_feat

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Now that we initialize jump_labels before sched_init() we can use them
for the debug features without having to worry about a window where
they have the wrong setting.

Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Link: http://lkml.kernel.org/n/tip-vpreo4hal9e0kzqmg5y0io2k@git.kernel.org
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Peter Zijlstra
2011-07-06 14:20:14 +02:00
committed by Ingo Molnar
parent be726ffd1e
commit f8b6d1cc7d
3 changed files with 81 additions and 22 deletions
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46
kernel/sched/core.c
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@@ -149,7 +149,7 @@ static int sched_feat_show(struct seq_file *m, void *v)
{
int i;
for (i = 0; sched_feat_names[i]; i++) {
for (i = 0; i < __SCHED_FEAT_NR; i++) {
if (!(sysctl_sched_features & (1UL << i)))
seq_puts(m, "NO_");
seq_printf(m, "%s ", sched_feat_names[i]);
@@ -159,6 +159,36 @@ static int sched_feat_show(struct seq_file *m, void *v)
return 0;
}
#ifdef HAVE_JUMP_LABEL
#define jump_label_key__true jump_label_key_enabled
#define jump_label_key__false jump_label_key_disabled
#define SCHED_FEAT(name, enabled) \
jump_label_key__##enabled ,
struct jump_label_key sched_feat_keys[__SCHED_FEAT_NR] = {
#include "features.h"
};
#undef SCHED_FEAT
static void sched_feat_disable(int i)
{
if (jump_label_enabled(&sched_feat_keys[i]))
jump_label_dec(&sched_feat_keys[i]);
}
static void sched_feat_enable(int i)
{
if (!jump_label_enabled(&sched_feat_keys[i]))
jump_label_inc(&sched_feat_keys[i]);
}
#else
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)
@@ -182,17 +212,20 @@ sched_feat_write(struct file *filp, const char __user *ubuf,
cmp += 3;
}
for (i = 0; sched_feat_names[i]; i++) {
for (i = 0; i < __SCHED_FEAT_NR; i++) {
if (strcmp(cmp, sched_feat_names[i]) == 0) {
if (neg)
if (neg) {
sysctl_sched_features &= ~(1UL << i);
else
sched_feat_disable(i);
} else {
sysctl_sched_features |= (1UL << i);
sched_feat_enable(i);
}
break;
}
}
if (!sched_feat_names[i])
if (i == __SCHED_FEAT_NR)
return -EINVAL;
*ppos += cnt;
@@ -221,8 +254,7 @@ static __init int sched_init_debug(void)
return 0;
}
late_initcall(sched_init_debug);
#endif
#endif /* CONFIG_SCHED_DEBUG */
/*
* Number of tasks to iterate in a single balance run.