The patch titled
rt ptracer can monopolize CPU (was: Cpu-Hotplug and Real-Time)
has been added to the -mm tree. Its filename is
rt-ptracer-can-monopolize-cpu-was-cpu-hotplug-and-real-time.patch
*** Remember to use Documentation/SubmitChecklist when testing your code ***
See http://www.zip.com.au/~akpm/linux/patches/stuff/added-to-mm.txt to find
out what to do about this
------------------------------------------------------
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 files 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
@@ -1109,7 +1109,7 @@ 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
rt-ptracer-can-monopolize-cpu-was-cpu-hotplug-and-real-time.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-cpuid-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
-
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