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function_graph: Support displaying relative timestamp 

When function_graph is used for latency tracers, relative timestamp
is more straightforward than absolute timestamp as function trace
does. This change adds relative timestamp support to function_graph
and applies to latency tracers (wakeup and irqsoff).

Instead of:

 # tracer: irqsoff
 #
 # irqsoff latency trace v1.1.5 on 5.0.0-rc1-test
 # --------------------------------------------------------------------
 # latency: 521 us, #1125/1125, CPU#2 | (M:preempt VP:0, KP:0, SP:0 HP:0 #P:8)
 #    -----------------
 #    | task: swapper/2-0 (uid:0 nice:0 policy:0 rt_prio:0)
 #    -----------------
 #  => started at: __schedule
 #  => ended at:   _raw_spin_unlock_irq
 #
 #
 #                                       _-----=> irqs-off
 #                                      / _----=> need-resched
 #                                     | / _---=> hardirq/softirq
 #                                     || / _--=> preempt-depth
 #                                     ||| /
 #     TIME        CPU  TASK/PID       ||||  DURATION                  FUNCTION CALLS
 #      |          |     |    |        ||||   |   |                     |   |   |   |
   124.974306 |   2)  systemd-693   |  d..1  0.000 us    |  __schedule();
   124.974307 |   2)  systemd-693   |  d..1              |    rcu_note_context_switch() {
   124.974308 |   2)  systemd-693   |  d..1  0.487 us    |      rcu_preempt_deferred_qs();
   124.974309 |   2)  systemd-693   |  d..1  0.451 us    |      rcu_qs();
   124.974310 |   2)  systemd-693   |  d..1  2.301 us    |    }
[..]
   124.974826 |   2)    <idle>-0    |  d..2              |  finish_task_switch() {
   124.974826 |   2)    <idle>-0    |  d..2              |    _raw_spin_unlock_irq() {
   124.974827 |   2)    <idle>-0    |  d..2  0.000 us    |  _raw_spin_unlock_irq();
   124.974828 |   2)    <idle>-0    |  d..2  0.000 us    |  tracer_hardirqs_on();
   <idle>-0       2d..2  552us : <stack trace>
  => __schedule
  => schedule_idle
  => do_idle
  => cpu_startup_entry
  => start_secondary
  => secondary_startup_64

Show:

 # tracer: irqsoff
 #
 # irqsoff latency trace v1.1.5 on 5.0.0-rc1-test+
 # --------------------------------------------------------------------
 # latency: 511 us, #1053/1053, CPU#7 | (M:preempt VP:0, KP:0, SP:0 HP:0 #P:8)
 #    -----------------
 #    | task: swapper/7-0 (uid:0 nice:0 policy:0 rt_prio:0)
 #    -----------------
 #  => started at: __schedule
 #  => ended at:   _raw_spin_unlock_irq
 #
 #
 #                                       _-----=> irqs-off
 #                                      / _----=> need-resched
 #                                     | / _---=> hardirq/softirq
 #                                     || / _--=> preempt-depth
 #                                     ||| /
 #   REL TIME      CPU  TASK/PID       ||||  DURATION                  FUNCTION CALLS
 #      |          |     |    |        ||||   |   |                     |   |   |   |
         0 us |   7)   sshd-1704    |  d..1  0.000 us    |  __schedule();
         1 us |   7)   sshd-1704    |  d..1              |    rcu_note_context_switch() {
         1 us |   7)   sshd-1704    |  d..1  0.611 us    |      rcu_preempt_deferred_qs();
         2 us |   7)   sshd-1704    |  d..1  0.484 us    |      rcu_qs();
         3 us |   7)   sshd-1704    |  d..1  2.599 us    |    }
[..]
       509 us |   7)    <idle>-0    |  d..2              |  finish_task_switch() {
       510 us |   7)    <idle>-0    |  d..2              |    _raw_spin_unlock_irq() {
       510 us |   7)    <idle>-0    |  d..2  0.000 us    |  _raw_spin_unlock_irq();
       512 us |   7)    <idle>-0    |  d..2  0.000 us    |  tracer_hardirqs_on();
   <idle>-0       7d..2  543us : <stack trace>
  => __schedule
  => schedule_idle
  => do_idle
  => cpu_startup_entry
  => start_secondary
  => secondary_startup_64

Link: http://lkml.kernel.org/r/20190101154614.8887-2-changbin.du@gmail.com

Signed-off-by: Changbin Du <changbin.du@gmail.com>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
This commit is contained in:
Changbin Du 2019-01-01 23:46:10 +08:00 committed by Steven Rostedt (VMware)
parent 8834f5600c
commit 9acd8de69d
4 changed files with 32 additions and 6 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

9
kernel/trace/trace.h
View File

@ -855,10 +855,11 @@ static __always_inline bool ftrace_hash_empty(struct ftrace_hash *hash)
#define TRACE_GRAPH_PRINT_PROC 0x8
#define TRACE_GRAPH_PRINT_DURATION 0x10
#define TRACE_GRAPH_PRINT_ABS_TIME 0x20
#define TRACE_GRAPH_PRINT_IRQS 0x40
#define TRACE_GRAPH_PRINT_TAIL 0x80
#define TRACE_GRAPH_SLEEP_TIME 0x100
#define TRACE_GRAPH_GRAPH_TIME 0x200
#define TRACE_GRAPH_PRINT_REL_TIME 0x40
#define TRACE_GRAPH_PRINT_IRQS 0x80
#define TRACE_GRAPH_PRINT_TAIL 0x100
#define TRACE_GRAPH_SLEEP_TIME 0x200
#define TRACE_GRAPH_GRAPH_TIME 0x400
#define TRACE_GRAPH_PRINT_FILL_SHIFT 28
#define TRACE_GRAPH_PRINT_FILL_MASK (0x3 << TRACE_GRAPH_PRINT_FILL_SHIFT)

25
kernel/trace/trace_functions_graph.c
View File

@ -500,6 +500,17 @@ static void print_graph_abs_time(u64 t, struct trace_seq *s)
(unsigned long)t, usecs_rem);
}
static void
print_graph_rel_time(struct trace_iterator *iter, struct trace_seq *s)
{
unsigned long long usecs;
usecs = iter->ts - iter->trace_buffer->time_start;
do_div(usecs, NSEC_PER_USEC);
trace_seq_printf(s, "%9llu us | ", usecs);
}
static void
print_graph_irq(struct trace_iterator *iter, unsigned long addr,
enum trace_type type, int cpu, pid_t pid, u32 flags)
@ -517,6 +528,10 @@ print_graph_irq(struct trace_iterator *iter, unsigned long addr,
if (flags & TRACE_GRAPH_PRINT_ABS_TIME)
print_graph_abs_time(iter->ts, s);
/* Relative time */
if (flags & TRACE_GRAPH_PRINT_REL_TIME)
print_graph_rel_time(iter, s);
/* Cpu */
if (flags & TRACE_GRAPH_PRINT_CPU)
print_graph_cpu(s, cpu);
@ -725,6 +740,10 @@ print_graph_prologue(struct trace_iterator *iter, struct trace_seq *s,
if (flags & TRACE_GRAPH_PRINT_ABS_TIME)
print_graph_abs_time(iter->ts, s);
/* Relative time */
if (flags & TRACE_GRAPH_PRINT_REL_TIME)
print_graph_rel_time(iter, s);
/* Cpu */
if (flags & TRACE_GRAPH_PRINT_CPU)
print_graph_cpu(s, cpu);
@ -1101,6 +1120,8 @@ static void print_lat_header(struct seq_file *s, u32 flags)
if (flags & TRACE_GRAPH_PRINT_ABS_TIME)
size += 16;
if (flags & TRACE_GRAPH_PRINT_REL_TIME)
size += 16;
if (flags & TRACE_GRAPH_PRINT_CPU)
size += 4;
if (flags & TRACE_GRAPH_PRINT_PROC)
@ -1125,6 +1146,8 @@ static void __print_graph_headers_flags(struct trace_array *tr,
seq_putc(s, '#');
if (flags & TRACE_GRAPH_PRINT_ABS_TIME)
seq_puts(s, " TIME ");
if (flags & TRACE_GRAPH_PRINT_REL_TIME)
seq_puts(s, " REL TIME ");
if (flags & TRACE_GRAPH_PRINT_CPU)
seq_puts(s, " CPU");
if (flags & TRACE_GRAPH_PRINT_PROC)
@ -1139,6 +1162,8 @@ static void __print_graph_headers_flags(struct trace_array *tr,
seq_putc(s, '#');
if (flags & TRACE_GRAPH_PRINT_ABS_TIME)
seq_puts(s, " | ");
if (flags & TRACE_GRAPH_PRINT_REL_TIME)
seq_puts(s, " | ");
if (flags & TRACE_GRAPH_PRINT_CPU)
seq_puts(s, " | ");
if (flags & TRACE_GRAPH_PRINT_PROC)

2
kernel/trace/trace_irqsoff.c
View File

@ -238,7 +238,7 @@ static void irqsoff_trace_close(struct trace_iterator *iter)
#define GRAPH_TRACER_FLAGS (TRACE_GRAPH_PRINT_CPU | \
TRACE_GRAPH_PRINT_PROC | \
TRACE_GRAPH_PRINT_ABS_TIME | \
TRACE_GRAPH_PRINT_REL_TIME | \
TRACE_GRAPH_PRINT_DURATION)
static enum print_line_t irqsoff_print_line(struct trace_iterator *iter)

2
kernel/trace/trace_sched_wakeup.c
View File

@ -180,7 +180,7 @@ static void wakeup_trace_close(struct trace_iterator *iter)
}
#define GRAPH_TRACER_FLAGS (TRACE_GRAPH_PRINT_PROC | \
TRACE_GRAPH_PRINT_ABS_TIME | \
TRACE_GRAPH_PRINT_REL_TIME | \
TRACE_GRAPH_PRINT_DURATION)
static enum print_line_t wakeup_print_line(struct trace_iterator *iter)