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Commit 345eb978 authored by Matt Wagantall's avatar Matt Wagantall Committed by Dmitry Shmidt
Browse files

ANDROID: 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: default avatarMatt Wagantall <mattw@codeaurora.org>
[rameezmustafa@codeaurora.org]: Port to msm-3.18]
Signed-off-by: default avatarSyed Rameez Mustafa <rameezmustafa@codeaurora.org>
[jstultz: forwardported to 4.4]
Signed-off-by: default avatarJohn Stultz <john.stultz@linaro.org>
Signed-off-by: default avatarAndres Oportus <andresoportus@google.com>
parent 989a768d

kernel/sched/rt.c

+9 −0
Original line number Diff line number Diff line
@@ -932,7 +932,16 @@ 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)

lib/Kconfig.debug

+9 −0
Original line number Diff line number Diff line
@@ -935,6 +935,15 @@ 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