sched: SCHED_FIFO/SCHED_RR watchdog timer
Introduce a new rlimit that allows the user to set a runtime timeout on
real-time tasks their slice. Once this limit is exceeded the task will receive
SIGXCPU.
So it measures runtime since the last sleep.
Input and ideas by Thomas Gleixner and Lennart Poettering.
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
CC: Lennart Poettering <mzxreary@0pointer.de>
CC: Michael Kerrisk <mtk.manpages@googlemail.com>
CC: Ulrich Drepper <drepper@redhat.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
diff --git a/include/asm-generic/resource.h b/include/asm-generic/resource.h
index a4a22cc..587566f 100644
--- a/include/asm-generic/resource.h
+++ b/include/asm-generic/resource.h
@@ -44,8 +44,8 @@
#define RLIMIT_NICE 13 /* max nice prio allowed to raise to
0-39 for nice level 19 .. -20 */
#define RLIMIT_RTPRIO 14 /* maximum realtime priority */
-
-#define RLIM_NLIMITS 15
+#define RLIMIT_RTTIME 15 /* timeout for RT tasks in us */
+#define RLIM_NLIMITS 16
/*
* SuS says limits have to be unsigned.
@@ -86,6 +86,7 @@
[RLIMIT_MSGQUEUE] = { MQ_BYTES_MAX, MQ_BYTES_MAX }, \
[RLIMIT_NICE] = { 0, 0 }, \
[RLIMIT_RTPRIO] = { 0, 0 }, \
+ [RLIMIT_RTTIME] = { RLIM_INFINITY, RLIM_INFINITY }, \
}
#endif /* __KERNEL__ */
diff --git a/include/linux/sched.h b/include/linux/sched.h
index a06d09e..fe3f8fb 100644
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -932,6 +932,7 @@
struct sched_rt_entity {
struct list_head run_list;
unsigned int time_slice;
+ unsigned long timeout;
};
struct task_struct {
