diff options
| author | Matt Wagantall <mattw@codeaurora.org> | 2014-06-19 14:23:33 -0700 |
|---|---|---|
| committer | John Stultz <john.stultz@linaro.org> | 2016-08-11 14:26:55 -0700 |
| commit | 2a4445395f1be46db1200e1329fae06d034675e5 (patch) | |
| tree | 1ec54e937dcc59cfc863e2a7b3049fc208480a89 | |
| parent | 989f33f789a85cc53f4c3f75e31ddfce65c6d873 (diff) | |
sched/rt: Add Kconfig option to enable panicking for RT throttling
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>
| -rw-r--r-- | kernel/sched/rt.c | 9 | ||||
| -rw-r--r-- | lib/Kconfig.debug | 9 |
2 files changed, 18 insertions, 0 deletions
diff --git a/kernel/sched/rt.c b/kernel/sched/rt.c index 2b9121ea91bf..8a16cba968c4 100644 --- a/kernel/sched/rt.c +++ b/kernel/sched/rt.c @@ -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); } 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); +#endif } static int sched_rt_runtime_exceeded(struct rt_rq *rt_rq) diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug index 8c15b29d5adc..07ccfa681577 100644 --- a/lib/Kconfig.debug +++ b/lib/Kconfig.debug @@ -855,6 +855,15 @@ config SCHED_INFO bool 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 bool "Collect scheduler statistics" depends on DEBUG_KERNEL && PROC_FS |