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Commit dc28abd8 authored by Sai Harshini Nimmala's avatar Sai Harshini Nimmala
Browse files

trace: Toggle irqsoff tracing to dmesg 



Allow tracing irqsoff to dmesg based on userspace tunable.

Change-Id: I36ca46c787d25ec08a6d050eed4ce0a23db26a1a
Signed-off-by: default avatarSai Harshini Nimmala <snimmala@codeaurora.org>
parent 41dfbf02

include/linux/sched/sysctl.h

+1 −0
Original line number Diff line number Diff line
@@ -82,6 +82,7 @@ extern unsigned int sysctl_preemptoff_tracing_threshold_ns; 
#endif

#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;

#endif



enum sched_tunable_scaling {

kernel/sysctl.c

+11 −0
Original line number Diff line number Diff line
@@ -141,6 +141,8 @@ static int ten_thousand = 10000; 
#ifdef CONFIG_PERF_EVENTS

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;

#ifdef CONFIG_SCHED_WALT

static int neg_three = -3;

static int three = 3;
@@ -355,6 +357,15 @@ static struct ctl_table kern_table[] = { 
		.data		= &sysctl_irqsoff_tracing_threshold_ns,

		.maxlen		= sizeof(unsigned int),

		.mode		= 0644,

		.proc_handler	= proc_douintvec_minmax,

		.extra1		= &half_million,

		.extra2		= &one_hundred_million,

	},

	{

		.procname	= "irqsoff_dmesg_output_enabled",

		.data		= &sysctl_irqsoff_dmesg_output_enabled,

		.maxlen		= sizeof(unsigned int),

		.mode		= 0644,

		.proc_handler	= proc_dointvec,

	},

#endif

kernel/trace/trace_irqsoff.c

+13 −3
Original line number Diff line number Diff line
@@ -608,11 +608,16 @@ static void irqsoff_tracer_stop(struct trace_array *tr) 


#ifdef CONFIG_IRQSOFF_TRACER

#ifdef CONFIG_PREEMPTIRQ_EVENTS

#define IRQSOFF_SENTINEL 0x0fffDEAD

/*

 * irqsoff stack tracing threshold in ns.

 * default: 1ms

 * default: 5ms

 */

unsigned int sysctl_irqsoff_tracing_threshold_ns = 5000000UL;

/*

 * Enable irqsoff tracing to dmesg

 */

unsigned int sysctl_irqsoff_tracing_threshold_ns = 1000000UL;

unsigned int sysctl_irqsoff_dmesg_output_enabled;



struct irqsoff_store {

	u64 ts;
@@ -637,9 +642,14 @@ void tracer_hardirqs_on(unsigned long a0, unsigned long a1) 
	delta = sched_clock() - is->ts;



	if (!is_idle_task(current) &&

			delta > sysctl_irqsoff_tracing_threshold_ns)

			delta > sysctl_irqsoff_tracing_threshold_ns) {

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

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

		if (sysctl_irqsoff_dmesg_output_enabled == IRQSOFF_SENTINEL)

			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]);

	}

	is->ts = 0;

	lockdep_on();

#endif /* CONFIG_PREEMPTIRQ_EVENTS */