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tracing: Define static void trace_print_time()

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The part of the code that prints the time of the trace record in
"int trace_print_context()" gets extracted in a static function. This
is done as a preparation for a following patch, in which we will define
a new ftrace event called "func_repeats". The new static method,
defined here, will be used by this new event to print the time of the
last repeat of a function that is consecutively called number of times.

Link: https://lkml.kernel.org/r/20210415181854.147448-2-y.karadz@gmail.com

Signed-off-by: Yordan Karadzhov (VMware) <y.karadz@gmail.com>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
This commit is contained in:
Yordan Karadzhov (VMware) 2021-04-15 21:18:49 +03:00 committed by Steven Rostedt (VMware)
parent ceaaa12904
commit eaa7a89720
1 changed files with 17 additions and 9 deletions
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26
kernel/trace/trace_output.c
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@ -587,13 +587,26 @@ lat_print_timestamp(struct trace_iterator *iter, u64 next_ts)
return !trace_seq_has_overflowed(s);
}
static void trace_print_time(struct trace_seq *s, struct trace_iterator *iter,
unsigned long long ts)
{
unsigned long secs, usec_rem;
unsigned long long t;
if (iter->iter_flags & TRACE_FILE_TIME_IN_NS) {
t = ns2usecs(ts);
usec_rem = do_div(t, USEC_PER_SEC);
secs = (unsigned long)t;
trace_seq_printf(s, " %5lu.%06lu", secs, usec_rem);
} else
trace_seq_printf(s, " %12llu", ts);
}
int trace_print_context(struct trace_iterator *iter)
{
struct trace_array *tr = iter->tr;
struct trace_seq *s = &iter->seq;
struct trace_entry *entry = iter->ent;
unsigned long long t;
unsigned long secs, usec_rem;
char comm[TASK_COMM_LEN];
trace_find_cmdline(entry->pid, comm);
@ -614,13 +627,8 @@ int trace_print_context(struct trace_iterator *iter)
if (tr->trace_flags & TRACE_ITER_IRQ_INFO)
trace_print_lat_fmt(s, entry);
if (iter->iter_flags & TRACE_FILE_TIME_IN_NS) {
t = ns2usecs(iter->ts);
usec_rem = do_div(t, USEC_PER_SEC);
secs = (unsigned long)t;
trace_seq_printf(s, " %5lu.%06lu: ", secs, usec_rem);
} else
trace_seq_printf(s, " %12llu: ", iter->ts);
trace_print_time(s, iter, iter->ts);
trace_seq_puts(s, ": ");
return !trace_seq_has_overflowed(s);
}