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sched/walt: improve preemptirq template based tracepoints

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To determine why a particular long preemption or long irqs off
period has happened, without crashing the device, the tracepoints
need improvement. The callers should be included.

Change-Id: If147969717517563e56cd20d3c036f51835a5c73
Signed-off-by: Stephen Dickey <quic_dickey@quicinc.com>
This commit is contained in:
Stephen Dickey 2021-12-06 14:57:52 -08:00
parent 127b73f001
commit 6b814579db
2 changed files with 27 additions and 13 deletions
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12
kernel/sched/walt/preemptirq_long.c
View File

@ -51,7 +51,7 @@ static void note_irq_disable(void *u1, unsigned long u2, unsigned long u3)
this_cpu_write(irq_disabled_ts, sched_clock());
}
static void test_irq_disable_long(void *u1, unsigned long u2, unsigned long u3)
static void test_irq_disable_long(void *u1, unsigned long ip, unsigned long parent_ip)
{
u64 ts = this_cpu_read(irq_disabled_ts);
@ -62,10 +62,10 @@ static void test_irq_disable_long(void *u1, unsigned long u2, unsigned long u3)
ts = sched_clock() - ts;
if (ts > sysctl_irqsoff_tracing_threshold_ns) {
trace_irq_disable_long(ts);
trace_irq_disable_long(ts, ip, parent_ip, CALLER_ADDR4, CALLER_ADDR5);
if (sysctl_irqsoff_dmesg_output_enabled == IRQSOFF_SENTINEL)
printk_deferred("D=%llu C:(%ps<-%ps<-%ps<-%ps)\n",
printk_deferred("irqs off exceeds thresh delta=%llu C:(%ps<-%ps<-%ps<-%ps)\n",
ts, (void *)CALLER_ADDR2,
(void *)CALLER_ADDR3,
(void *)CALLER_ADDR4,
@ -90,8 +90,8 @@ static void note_preempt_disable(void *u1, unsigned long u2, unsigned long u3)
ps->ncsw = current->nvcsw + current->nivcsw;
}
static void test_preempt_disable_long(void *u1, unsigned long u2,
unsigned long u3)
static void test_preempt_disable_long(void *u1, unsigned long ip,
unsigned long parent_ip)
{
struct preempt_store *ps = &per_cpu(the_ps, raw_smp_processor_id());
u64 delta = 0;
@ -114,7 +114,7 @@ static void test_preempt_disable_long(void *u1, unsigned long u2,
ps->ts = 0;
if (delta > sysctl_preemptoff_tracing_threshold_ns)
trace_preempt_disable_long(delta);
trace_preempt_disable_long(delta, ip, parent_ip, CALLER_ADDR4, CALLER_ADDR5);
}
static struct ctl_table preemptirq_long_table[] = {

28
kernel/sched/walt/preemptirq_long.h
View File

@ -14,30 +14,44 @@
#include <linux/tracepoint.h>
/* reference preemptirq_template */
DECLARE_EVENT_CLASS(preemptirq_long_template,
TP_PROTO(u64 delta),
TP_PROTO(u64 delta, unsigned long ip, unsigned long parent_ip,
unsigned long pparent_ip, unsigned long ppparent_ip),
TP_ARGS(delta),
TP_ARGS(delta, ip, parent_ip, pparent_ip, ppparent_ip),
TP_STRUCT__entry(
__field(u64, delta)
__field(unsigned long, caller_offs)
__field(unsigned long, parent_offs)
__field(unsigned long, pparent_offs)
__field(unsigned long, ppparent_offs)
),
TP_fast_assign(
__entry->delta = delta;
__entry->caller_offs = ip;
__entry->parent_offs = parent_ip;
__entry->pparent_offs = pparent_ip;
__entry->ppparent_offs = ppparent_ip;
),
TP_printk("delta=%llu(ns)", __entry->delta)
TP_printk("delta=%llu(ns) caller=%ps <- %ps <- %ps <- %ps",
__entry->delta, __entry->caller_offs,
__entry->parent_offs, __entry->pparent_offs, __entry->ppparent_offs)
);
DEFINE_EVENT(preemptirq_long_template, irq_disable_long,
TP_PROTO(u64 delta),
TP_ARGS(delta));
TP_PROTO(u64 delta, unsigned long ip, unsigned long parent_ip,
unsigned long pparent_ip, unsigned long ppparent_ip),
TP_ARGS(delta, ip, parent_ip, pparent_ip, ppparent_ip));
DEFINE_EVENT(preemptirq_long_template, preempt_disable_long,
TP_PROTO(u64 delta),
TP_ARGS(delta));
TP_PROTO(u64 delta, unsigned long ip, unsigned long parent_ip,
unsigned long pparent_ip, unsigned long ppparent_ip),
TP_ARGS(delta, ip, parent_ip, pparent_ip, ppparent_ip));
#endif /* _TRACE_PREEMPTIRQ_LONG_H */