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authorJoel Fernandes <joelaf@google.com>2017-06-25 22:38:43 -0700
committerSteven Rostedt (VMware) <rostedt@goodmis.org>2017-06-27 13:30:28 -0400
commit441dae8f2f2975c68101a84bc3f528ec95ecf7c3 (patch)
tree0f16d4550fafdff2718a33b7cc99ba8ab3391794 /kernel/trace
parentd914ba37d7145acb9fd3bb23075c2d56e5a44eb6 (diff)
tracing: Add support for display of tgid in trace output
Earlier patches introduced ability to record the tgid using the 'record-tgid' option. Here we read the tgid and output it if the option is enabled. Link: http://lkml.kernel.org/r/20170626053844.5746-3-joelaf@google.com Cc: kernel-team@android.com Cc: Ingo Molnar <mingo@redhat.com> Tested-by: Michael Sartain <mikesart@gmail.com> Signed-off-by: Joel Fernandes <joelaf@google.com> Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
Diffstat (limited to 'kernel/trace')
-rw-r--r--kernel/trace/trace.c36
-rw-r--r--kernel/trace/trace_output.c9
2 files changed, 31 insertions, 14 deletions
diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c
index ab9db750dd29..c579dea4a0eb 100644
--- a/kernel/trace/trace.c
+++ b/kernel/trace/trace.c
@@ -3319,23 +3319,29 @@ static void print_event_info(struct trace_buffer *buf, struct seq_file *m)
seq_puts(m, "#\n");
}
-static void print_func_help_header(struct trace_buffer *buf, struct seq_file *m)
+static void print_func_help_header(struct trace_buffer *buf, struct seq_file *m,
+ unsigned int flags)
{
+ bool tgid = flags & TRACE_ITER_RECORD_TGID;
+
print_event_info(buf, m);
- seq_puts(m, "# TASK-PID CPU# TIMESTAMP FUNCTION\n"
- "# | | | | |\n");
+
+ seq_printf(m, "# TASK-PID CPU# %s TIMESTAMP FUNCTION\n", tgid ? "TGID " : "");
+ seq_printf(m, "# | | | %s | |\n", tgid ? " | " : "");
}
-static void print_func_help_header_irq(struct trace_buffer *buf, struct seq_file *m)
+static void print_func_help_header_irq(struct trace_buffer *buf, struct seq_file *m,
+ unsigned int flags)
{
- print_event_info(buf, m);
- seq_puts(m, "# _-----=> irqs-off\n"
- "# / _----=> need-resched\n"
- "# | / _---=> hardirq/softirq\n"
- "# || / _--=> preempt-depth\n"
- "# ||| / delay\n"
- "# TASK-PID CPU# |||| TIMESTAMP FUNCTION\n"
- "# | | | |||| | |\n");
+ bool tgid = flags & TRACE_ITER_RECORD_TGID;
+
+ seq_printf(m, "# %s _-----=> irqs-off\n", tgid ? " " : "");
+ seq_printf(m, "# %s / _----=> need-resched\n", tgid ? " " : "");
+ seq_printf(m, "# %s| / _---=> hardirq/softirq\n", tgid ? " " : "");
+ seq_printf(m, "# %s|| / _--=> preempt-depth\n", tgid ? " " : "");
+ seq_printf(m, "# %s||| / delay\n", tgid ? " " : "");
+ seq_printf(m, "# TASK-PID CPU#%s|||| TIMESTAMP FUNCTION\n", tgid ? " TGID " : "");
+ seq_printf(m, "# | | | %s|||| | |\n", tgid ? " | " : "");
}
void
@@ -3651,9 +3657,11 @@ void trace_default_header(struct seq_file *m)
} else {
if (!(trace_flags & TRACE_ITER_VERBOSE)) {
if (trace_flags & TRACE_ITER_IRQ_INFO)
- print_func_help_header_irq(iter->trace_buffer, m);
+ print_func_help_header_irq(iter->trace_buffer,
+ m, trace_flags);
else
- print_func_help_header(iter->trace_buffer, m);
+ print_func_help_header(iter->trace_buffer, m,
+ trace_flags);
}
}
}
diff --git a/kernel/trace/trace_output.c b/kernel/trace/trace_output.c
index 01ff99969ca7..bac629af2285 100644
--- a/kernel/trace/trace_output.c
+++ b/kernel/trace/trace_output.c
@@ -597,6 +597,15 @@ int trace_print_context(struct trace_iterator *iter)
trace_seq_printf(s, "%16s-%-5d [%03d] ",
comm, entry->pid, iter->cpu);
+ if (tr->trace_flags & TRACE_ITER_RECORD_TGID) {
+ unsigned int tgid = trace_find_tgid(entry->pid);
+
+ if (!tgid)
+ trace_seq_printf(s, "(-----) ");
+ else
+ trace_seq_printf(s, "(%5d) ", tgid);
+ }
+
if (tr->trace_flags & TRACE_ITER_IRQ_INFO)
trace_print_lat_fmt(s, entry);