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Commit 2c6c2435 authored by Sai Harshini Nimmala's avatar Sai Harshini Nimmala
Browse files

trace: Add warning threshold for irqsoff time 



Trigger a crash when hardirqs_off time period crosses the
warning threshold.

Change-Id: Ifa96a51cd27a154ee2c207c82f1a145a80558c76
Signed-off-by: default avatarSai Harshini Nimmala <snimmala@codeaurora.org>
parent dc28abd8

include/linux/sched/sysctl.h

+2 −0
Original line number Diff line number Diff line
@@ -83,6 +83,8 @@ extern unsigned int sysctl_preemptoff_tracing_threshold_ns; 
#if defined(CONFIG_PREEMPTIRQ_EVENTS) && defined(CONFIG_IRQSOFF_TRACER)

extern unsigned int sysctl_irqsoff_tracing_threshold_ns;

extern unsigned int sysctl_irqsoff_dmesg_output_enabled;

extern unsigned int sysctl_irqsoff_crash_sentinel_value;

extern unsigned int sysctl_irqsoff_crash_threshold_ns;

#endif



enum sched_tunable_scaling {

kernel/sysctl.c

+17 −0
Original line number Diff line number Diff line
@@ -143,6 +143,7 @@ static int six_hundred_forty_kb = 640 * 1024; 
#endif

static unsigned int __maybe_unused half_million = 500000;

static unsigned int __maybe_unused one_hundred_million = 100000000;

static unsigned int __maybe_unused one_million = 1000000;

#ifdef CONFIG_SCHED_WALT

static int neg_three = -3;

static int three = 3;
@@ -368,6 +369,22 @@ static struct ctl_table kern_table[] = { 
		.mode		= 0644,

		.proc_handler	= proc_dointvec,

	},

	{

		.procname	= "irqsoff_crash_sentinel_value",

		.data		= &sysctl_irqsoff_crash_sentinel_value,

		.maxlen		= sizeof(unsigned int),

		.mode		= 0644,

		.proc_handler	= proc_dointvec,

	},

	{

		.procname	= "irqsoff_crash_threshold_ns",

		.data		= &sysctl_irqsoff_crash_threshold_ns,

		.maxlen		= sizeof(unsigned int),

		.mode		= 0644,

		.proc_handler	= proc_douintvec_minmax,

		.extra1		= &one_million,

		.extra2		= &one_hundred_million,

	},

#endif

#ifdef CONFIG_SCHED_WALT

	{

kernel/trace/trace_irqsoff.c

+16 −0
Original line number Diff line number Diff line
@@ -618,6 +618,14 @@ unsigned int sysctl_irqsoff_tracing_threshold_ns = 5000000UL; 
 * Enable irqsoff tracing to dmesg

 */

unsigned int sysctl_irqsoff_dmesg_output_enabled;

/*

 * Sentinel value to prevent unnecessary irqsoff crash

 */

unsigned int sysctl_irqsoff_crash_sentinel_value;

/*

 * Irqsoff warning threshold to trigger crash

 */

unsigned int sysctl_irqsoff_crash_threshold_ns = 10000000UL;



struct irqsoff_store {

	u64 ts;
@@ -649,6 +657,14 @@ void tracer_hardirqs_on(unsigned long a0, unsigned long a1) 
			printk_deferred(KERN_ERR "D=%llu C:(%ps<-%ps<-%ps<-%ps)\n",

				delta, is->caddr[0], is->caddr[1],

					is->caddr[2], is->caddr[3]);

		if (sysctl_irqsoff_crash_sentinel_value == IRQSOFF_SENTINEL &&

			delta > sysctl_irqsoff_crash_threshold_ns) {

			printk_deferred(KERN_ERR

			"delta=%llu(ns) > crash_threshold=%llu(ns) Task=%s\n",

				delta, sysctl_irqsoff_crash_threshold_ns,

					current->comm);

			BUG_ON(1);

		}

	}

	is->ts = 0;

	lockdep_on();