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perf tools: Add debug prints for ordered events queue 

Adding some prints for ordered events queue, to help debug issues.

Adding debug_ordered_events debug variable to be able to enable ordered
events debug messages using:

  $ perf --debug ordered-events=2 report ...

Also using oe pointer in perf_session__queue_event instead of chained
session variable dereferencing.

Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Acked-by: David Ahern <dsahern@gmail.com>
Cc: Corey Ashford <cjashfor@linux.vnet.ibm.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Jean Pihet <jean.pihet@linaro.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Link: http://lkml.kernel.org/n/tip-7p3mnnopjvsp9nmk9msqcfkm@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Jiri Olsa 2014-07-11 14:49:54 +02:00 committed by Arnaldo Carvalho de Melo
parent 94786b67b5
commit cee3ab9caa
4 changed files with 72 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

36
tools/perf/util/debug.c
View File

@ -13,8 +13,12 @@
#include "util.h"
#include "target.h"
#define NSECS_PER_SEC 1000000000ULL
#define NSECS_PER_USEC 1000ULL
int verbose;
bool dump_trace = false, quiet = false;
int debug_ordered_events;
static int _eprintf(int level, int var, const char *fmt, va_list args)
{
@ -42,6 +46,35 @@ int eprintf(int level, int var, const char *fmt, ...)
return ret;
}
static int __eprintf_time(u64 t, const char *fmt, va_list args)
{
int ret = 0;
u64 secs, usecs, nsecs = t;
secs = nsecs / NSECS_PER_SEC;
nsecs -= secs * NSECS_PER_SEC;
usecs = nsecs / NSECS_PER_USEC;
ret = fprintf(stderr, "[%13" PRIu64 ".%06" PRIu64 "] ",
secs, usecs);
ret += vfprintf(stderr, fmt, args);
return ret;
}
int eprintf_time(int level, int var, u64 t, const char *fmt, ...)
{
int ret = 0;
va_list args;
if (var >= level) {
va_start(args, fmt);
ret = __eprintf_time(t, fmt, args);
va_end(args);
}
return ret;
}
/*
* Overloading libtraceevent standard info print
* function, display with -v in perf.
@ -110,7 +143,8 @@ static struct debug_variable {
const char *name;
int *ptr;
} debug_variables[] = {
{ .name = "verbose", .ptr = &verbose },
{ .name = "verbose", .ptr = &verbose },
{ .name = "ordered-events", .ptr = &debug_ordered_events},
{ .name = NULL, }
};

8
tools/perf/util/debug.h
View File

@ -10,6 +10,7 @@
extern int verbose;
extern bool quiet, dump_trace;
extern int debug_ordered_events;
#ifndef pr_fmt
#define pr_fmt(fmt) fmt
@ -29,6 +30,12 @@ extern bool quiet, dump_trace;
#define pr_debug3(fmt, ...) pr_debugN(3, pr_fmt(fmt), ##__VA_ARGS__)
#define pr_debug4(fmt, ...) pr_debugN(4, pr_fmt(fmt), ##__VA_ARGS__)
#define pr_time_N(n, var, t, fmt, ...) \
eprintf_time(n, var, t, fmt, ##__VA_ARGS__)
#define pr_oe_time(t, fmt, ...) pr_time_N(1, debug_ordered_events, t, pr_fmt(fmt), ##__VA_ARGS__)
#define pr_oe_time2(t, fmt, ...) pr_time_N(2, debug_ordered_events, t, pr_fmt(fmt), ##__VA_ARGS__)
int dump_printf(const char *fmt, ...) __attribute__((format(printf, 1, 2)));
void trace_event(union perf_event *event);
@ -38,6 +45,7 @@ int ui__warning(const char *format, ...) __attribute__((format(printf, 1, 2)));
void pr_stat(const char *fmt, ...);
int eprintf(int level, int var, const char *fmt, ...) __attribute__((format(printf, 3, 4)));
int eprintf_time(int level, int var, u64 t, const char *fmt, ...) __attribute__((format(printf, 4, 5)));
int perf_debug_option(const char *str);

26
tools/perf/util/ordered-events.c
View File

@ -1,10 +1,16 @@
#include <linux/list.h>
#include <linux/compiler.h>
#include "ordered-events.h"
#include "evlist.h"
#include "session.h"
#include "asm/bug.h"
#include "debug.h"
#define pr_N(n, fmt, ...) \
eprintf(n, debug_ordered_events, fmt, ##__VA_ARGS__)
#define pr(fmt, ...) pr_N(1, pr_fmt(fmt), ##__VA_ARGS__)
static void queue_event(struct ordered_events *oe, struct ordered_event *new)
{
struct ordered_event *last = oe->last;
@ -14,6 +20,8 @@ static void queue_event(struct ordered_events *oe, struct ordered_event *new)
++oe->nr_events;
oe->last = new;
pr_oe_time2(timestamp, "queue_event nr_events %u\n", oe->nr_events);
if (!last) {
list_add(&new->list, &oe->events);
oe->max_timestamp = timestamp;
@ -69,12 +77,17 @@ static struct ordered_event *alloc_event(struct ordered_events *oe)
if (!oe->buffer)
return NULL;
pr("alloc size %" PRIu64 "B (+%zu), max %" PRIu64 "B\n",
oe->cur_alloc_size, size, oe->max_alloc_size);
oe->cur_alloc_size += size;
list_add(&oe->buffer->list, &oe->to_free);
/* First entry is abused to maintain the to_free list. */
oe->buffer_idx = 2;
new = oe->buffer + 1;
} else {
pr("allocation limit reached %" PRIu64 "B\n", oe->max_alloc_size);
}
return new;
@ -155,6 +168,11 @@ int ordered_events__flush(struct perf_session *s, struct perf_tool *tool,
enum oe_flush how)
{
struct ordered_events *oe = &s->ordered_events;
static const char * const str[] = {
"FINAL",
"ROUND",
"HALF ",
};
int err;
switch (how) {
@ -184,6 +202,10 @@ int ordered_events__flush(struct perf_session *s, struct perf_tool *tool,
break;
};
pr_oe_time(oe->next_flush, "next_flush - ordered_events__flush PRE %s, nr_events %u\n",
str[how], oe->nr_events);
pr_oe_time(oe->max_timestamp, "max_timestamp\n");
err = __ordered_events__flush(s, tool);
if (!err) {
@ -191,6 +213,10 @@ int ordered_events__flush(struct perf_session *s, struct perf_tool *tool,
oe->next_flush = oe->max_timestamp;
}
pr_oe_time(oe->next_flush, "next_flush - ordered_events__flush POST %s, nr_events %u\n",
str[how], oe->nr_events);
pr_oe_time(oe->last_flush, "last_flush\n");
return err;
}

4
tools/perf/util/session.c
View File

@ -499,8 +499,10 @@ int perf_session_queue_event(struct perf_session *s, union perf_event *event,
if (!timestamp || timestamp == ~0ULL)
return -ETIME;
if (timestamp < s->ordered_events.last_flush) {
if (timestamp < oe->last_flush) {
printf("Warning: Timestamp below last timeslice flush\n");
pr_oe_time(timestamp, "out of order event");
pr_oe_time(oe->last_flush, "last flush");
return -EINVAL;
}