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sched/rt: Add Kconfig option to enable panicking for RT throttling

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This may be useful for detecting and debugging RT throttling issues.

Change-Id: I5807a897d11997d76421c1fcaa2918aad988c6c9
Signed-off-by: Matt Wagantall <mattw@codeaurora.org>
[rameezmustafa@codeaurora.org]: Port to msm-3.18]
Signed-off-by: Syed Rameez Mustafa <rameezmustafa@codeaurora.org>
[jstultz: forwardported to 4.4]
Signed-off-by: John Stultz <john.stultz@linaro.org>
This commit is contained in:
Matt Wagantall 2014-06-19 14:23:33 -07:00 • committed by Amit Pundir
parent 6bd4858471
commit 6c6dc1632a
2 changed files with 18 additions and 0 deletions
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9
kernel/sched/rt.c
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@ -924,7 +924,16 @@ static void dump_throttled_rt_tasks(struct rt_rq *rt_rq)
idx = find_next_bit(array->bitmap, MAX_RT_PRIO, idx + 1); idx = find_next_bit(array->bitmap, MAX_RT_PRIO, idx + 1);
} }
out: out:
#ifdef CONFIG_PANIC_ON_RT_THROTTLING
/*
* Use pr_err() in the BUG() case since printk_sched() will
* not get flushed and deadlock is not a concern.
*/
pr_err("%s", buf);
BUG();
#else
printk_deferred("%s", buf); printk_deferred("%s", buf);
#endif
} }
static int sched_rt_runtime_exceeded(struct rt_rq *rt_rq) static int sched_rt_runtime_exceeded(struct rt_rq *rt_rq)

9
lib/Kconfig.debug
View file

@ -867,6 +867,15 @@ config SCHED_INFO
bool bool
default n default n
config PANIC_ON_RT_THROTTLING
bool "Panic on RT throttling"
help
Say Y here to enable the kernel to panic when a realtime
runqueue is throttled. This may be useful for detecting
and debugging RT throttling issues.
Say N if unsure.
config SCHEDSTATS config SCHEDSTATS
bool "Collect scheduler statistics" bool "Collect scheduler statistics"
depends on DEBUG_KERNEL && PROC_FS depends on DEBUG_KERNEL && PROC_FS