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Subject[PATCH bpf-next] samples/bpf: offwaketime: pretty print
Date
From: Rong Tao <rongtao@cestc.cn>

A sample of call stack:
swapper/10 [
secondary_startup_64_no_verify
cpu_startup_entry
do_idle
schedule_idle
__schedule
__traceiter_sched_switch
__traceiter_sched_switch
-
try_to_wake_up
call_timer_fn
__run_timers.part.0
run_timer_softirq
__softirqentry_text_start
__irq_exit_rcu
sysvec_apic_timer_interrupt
asm_sysvec_apic_timer_interrupt
cpuidle_enter_state
cpuidle_enter
cpuidle_idle_call
do_idle
cpu_startup_entry
secondary_startup_64_no_verify
] swapper/10 1

Signed-off-by: Rong Tao <rongtao@cestc.cn>
---
samples/bpf/offwaketime_user.c | 14 +++++++-------
1 file changed, 7 insertions(+), 7 deletions(-)

diff --git a/samples/bpf/offwaketime_user.c b/samples/bpf/offwaketime_user.c
index b6eedcb98fb9..d89278d62e4e 100644
--- a/samples/bpf/offwaketime_user.c
+++ b/samples/bpf/offwaketime_user.c
@@ -30,9 +30,9 @@ static void print_ksym(__u64 addr)
}

if (PRINT_RAW_ADDR)
- printf("%s/%llx;", sym->name, addr);
+ printf("\t%s/%llx\n", sym->name, addr);
else
- printf("%s;", sym->name);
+ printf("\t%s\n", sym->name);
}

#define TASK_COMM_LEN 16
@@ -50,21 +50,21 @@ static void print_stack(struct key_t *key, __u64 count)
static bool warned;
int i;

- printf("%s;", key->target);
+ printf("%s [\n", key->target);
if (bpf_map_lookup_elem(map_fd[1], &key->tret, ip) != 0) {
- printf("---;");
+ printf("\t---\n");
} else {
for (i = PERF_MAX_STACK_DEPTH - 1; i >= 0; i--)
print_ksym(ip[i]);
}
- printf("-;");
+ printf("\t-\n");
if (bpf_map_lookup_elem(map_fd[1], &key->wret, ip) != 0) {
- printf("---;");
+ printf("\t---\n");
} else {
for (i = 0; i < PERF_MAX_STACK_DEPTH; i++)
print_ksym(ip[i]);
}
- printf(";%s %lld\n", key->waker, count);
+ printf("] %s %lld\n", key->waker, count);

if ((key->tret == -EEXIST || key->wret == -EEXIST) && !warned) {
printf("stackmap collisions seen. Consider increasing size\n");
--
2.31.1
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