The patch titled
rt ptracer can monopolize CPU (was: Cpu-Hotplug and Real-Time)
has been removed from the -mm tree. Its filename was
rt-ptracer-can-monopolize-cpu-was-cpu-hotplug-and-real-time.patch
This patch was dropped because it was merged into mainline or a subsystem tree
------------------------------------------------------
Subject: rt ptracer can monopolize CPU (was: Cpu-Hotplug and Real-Time)
From: Gautham R Shenoy <ego@xxxxxxxxxx>
yield() in wait_task_inactive(), can cause a high priority thread to be
scheduled back in, and there by loop forever while it is waiting for some
lower priority thread which is unfortunately still on the runqueue.
Use schedule_timeout_uninterruptible(1) instead.
Signed-off-by: Gautham R Shenoy <ego@xxxxxxxxxx>
Credit: Oleg Nesterov <oleg@xxxxxxxxxx>
Cc: Ingo Molnar <mingo@xxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
kernel/sched.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff -puN kernel/sched.c~rt-ptracer-can-monopolize-cpu-was-cpu-hotplug-and-real-time kernel/sched.c
--- a/kernel/sched.c~rt-ptracer-can-monopolize-cpu-was-cpu-hotplug-and-real-time
+++ a/kernel/sched.c
@@ -1130,7 +1130,7 @@ repeat:
* yield - it could be a while.
*/
if (unlikely(on_rq)) {
- yield();
+ schedule_timeout_uninterruptible(1);
goto repeat;
}
_
Patches currently in -mm which might be from ego@xxxxxxxxxx are
git-sched.patch
cpu-hotplug-slab-cleanup-cpuup_callback.patch
cpu-hotplug-slab-fix-memory-leak-in-cpu-hotplug-error-path.patch
cpu-hotplug-cpu-deliver-cpu_up_canceled-only-to-notify_oked-callbacks-with-cpu_up_prepare.patch
cpu-hotplug-topology-remove-topology_dev_map.patch
cpu-hotplug-thermal_throttle-fix-cpu-hotplug-error-handling.patch
cpu-hotplug-msr-fix-cpu-hotplug-error-handling.patch
cpu-hotplug-mce-fix-cpu-hotplug-error-handling.patch
cpu-hotplug-intel_cacheinfo-fix-cpu-hotplug-error-handling.patch
cpu-hotplug-intel_cacheinfo-fix-cpu-hotplug-error-handling-fix-a-section-mismatch-warning.patch
do-cpu_dead-migrating-under-read_locktasklist-instead-of-write_lock_irqtasklist.patch
migration_callcpu_dead-use-spin_lock_irq-instead-of-task_rq_lock.patch
-
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