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trace: Toggle irqsoff tracing to dmesg

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Allow tracing irqsoff to dmesg based on userspace tunable.

Change-Id: I36ca46c787d25ec08a6d050eed4ce0a23db26a1a
Signed-off-by: Sai Harshini Nimmala <snimmala@codeaurora.org>
This commit is contained in:
Sai Harshini Nimmala
2020-02-26 12:30:22 -08:00
parent 41dfbf027b
commit dc28abd851
3 changed files with 25 additions and 3 deletions
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1
include/linux/sched/sysctl.h
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@@ -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 {

11
kernel/sysctl.c
View File

@@ -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

16
kernel/trace/trace_irqsoff.c
View File

@@ -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 = 1000000UL;
unsigned int sysctl_irqsoff_tracing_threshold_ns = 5000000UL;
/*
* Enable irqsoff tracing to dmesg
*/
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 */