Commit-ID: 3c7d51843b03a6839e9ec7cda724e54d2319a63a
Gitweb: http://git.kernel.org/tip/3c7d51843b03a6839e9ec7cda724e54d2319a63a
Author: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
AuthorDate: Sun, 17 Jul 2011 20:46:52 +0200
Committer: Ingo Molnar <mingo@xxxxxxx>
CommitDate: Thu, 1 Mar 2012 10:46:54 +0100
sched/rt: Do not submit new work when PI-blocked
When we are PI-blocked then we want to get things done ASAP.
Signed-off-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Acked-by: Peter Zijlstra <a.p.zijlstra@xxxxxxxxx>
Link: http://lkml.kernel.org/n/tip-vw8et3445km5b8mpihf4trae@xxxxxxxxxxxxxx
Signed-off-by: Ingo Molnar <mingo@xxxxxxx>
---
include/linux/sched.h | 8 ++++++++
kernel/sched/core.c | 2 +-
2 files changed, 9 insertions(+), 1 deletions(-)
diff --git a/include/linux/sched.h b/include/linux/sched.h
index 03dd224..c628a91 100644
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -2082,12 +2082,20 @@ extern unsigned int sysctl_sched_cfs_bandwidth_slice;
extern int rt_mutex_getprio(struct task_struct *p);
extern void rt_mutex_setprio(struct task_struct *p, int prio);
extern void rt_mutex_adjust_pi(struct task_struct *p);
+static inline bool tsk_is_pi_blocked(struct task_struct *tsk)
+{
+ return tsk->pi_blocked_on != NULL;
+}
#else
static inline int rt_mutex_getprio(struct task_struct *p)
{
return p->normal_prio;
}
# define rt_mutex_adjust_pi(p) do { } while (0)
+static inline bool tsk_is_pi_blocked(struct task_struct *tsk)
+{
+ return false;
+}
#endif
extern bool yield_to(struct task_struct *p, bool preempt);
diff --git a/kernel/sched/core.c b/kernel/sched/core.c
index c2bbdec..25e06a5 100644
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -3227,7 +3227,7 @@ need_resched:
static inline void sched_submit_work(struct task_struct *tsk)
{
- if (!tsk->state)
+ if (!tsk->state || tsk_is_pi_blocked(tsk))
return;
/*
* If we are going to sleep and we have plugged IO queued,
--
To unsubscribe from this list: send the line "unsubscribe linux-tip-commits" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
|