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Commit 7f71cd59 authored by Vikram Mulukutla's avatar Vikram Mulukutla Committed by Satya Durga Srinivasu Prabhala
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sched: Add the sched_set_wake_to_idle API 



Tasks may want to be placed on an idle CPU, overriding
regular task placement logic. Add the API that provides
this feature. It's upto the placement logic to actually
respect the new PF_* flag.

Change-Id: I0b39ecb8556e30ed30ff0c31ac683d92844573d5
Signed-off-by: default avatarVikram Mulukutla <markivx@codeaurora.org>
Signed-off-by: default avatarSatya Durga Srinivasu Prabhala <satyap@codeaurora.org>
parent 8c72aa73

include/linux/sched.h

+29 −0
Original line number Diff line number Diff line
@@ -1315,6 +1315,7 @@ extern struct pid *cad_pid; 
#define PF_KTHREAD		0x00200000	/* I am a kernel thread */

#define PF_RANDOMIZE		0x00400000	/* Randomize virtual address space */

#define PF_SWAPWRITE		0x00800000	/* Allowed to write to swap */

#define PF_WAKE_UP_IDLE         0x01000000	/* TTWU on an idle CPU */

#define PF_NO_SETAFFINITY	0x04000000	/* Userland is not allowed to meddle with cpus_allowed */

#define PF_MCE_EARLY		0x08000000      /* Early kill for mce process policy */

#define PF_MUTEX_TESTER		0x20000000	/* Thread belongs to the rt mutex tester */
@@ -1667,4 +1668,32 @@ extern long sched_getaffinity(pid_t pid, struct cpumask *mask); 
#define TASK_SIZE_OF(tsk)	TASK_SIZE

#endif



static inline u32 sched_get_wake_up_idle(struct task_struct *p)

{

	u32 enabled = p->flags & PF_WAKE_UP_IDLE;



	return !!enabled;

}



static inline int sched_set_wake_up_idle(struct task_struct *p,

						int wake_up_idle)

{

	int enable = !!wake_up_idle;



	if (enable)

		p->flags |= PF_WAKE_UP_IDLE;

	else

		p->flags &= ~PF_WAKE_UP_IDLE;



	return 0;

}



static inline void set_wake_up_idle(bool enabled)

{

	if (enabled)

		current->flags |= PF_WAKE_UP_IDLE;

	else

		current->flags &= ~PF_WAKE_UP_IDLE;

}



#endif