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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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27
kernel/sched/sched.h
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@@ -581,6 +581,7 @@ static inline void __set_task_cpu(struct task_struct *p, unsigned int cpu)
* Tunables that become constants when CONFIG_SCHED_DEBUG is off:
*/
#ifdef CONFIG_SCHED_DEBUG
# include <linux/jump_label.h>
# define const_debug __read_mostly
#else
# define const_debug const
@@ -593,11 +594,37 @@ extern const_debug unsigned int sysctl_sched_features;
enum {
#include "features.h"
__SCHED_FEAT_NR,
};
#undef SCHED_FEAT
#if defined(CONFIG_SCHED_DEBUG) && defined(HAVE_JUMP_LABEL)
static __always_inline bool static_branch__true(struct jump_label_key *key)
{
return likely(static_branch(key)); /* Not out of line branch. */
}
static __always_inline bool static_branch__false(struct jump_label_key *key)
{
return unlikely(static_branch(key)); /* Out of line branch. */
}
#define SCHED_FEAT(name, enabled) \
static __always_inline bool static_branch_##name(struct jump_label_key *key) \
{ \
return static_branch__##enabled(key); \
}
#include "features.h"
#undef SCHED_FEAT
extern struct jump_label_key sched_feat_keys[__SCHED_FEAT_NR];
#define sched_feat(x) (static_branch_##x(&sched_feat_keys[__SCHED_FEAT_##x]))
#else /* !(SCHED_DEBUG && HAVE_JUMP_LABEL) */
#define sched_feat(x) (sysctl_sched_features & (1UL << __SCHED_FEAT_##x))
#endif /* SCHED_DEBUG && HAVE_JUMP_LABEL */
static inline u64 global_rt_period(void)
{