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 ...
Cc: Arnaldo Carvalho de Melo <a...@kernel.org>
Cc: Corey Ashford <cjash...@linux.vnet.ibm.com>
Cc: David Ahern <dsah...@gmail.com>
Cc: Frederic Weisbecker <fweis...@gmail.com>
Cc: Ingo Molnar <mi...@kernel.org>
Cc: Jean Pihet <jean.pi...@linaro.org>
Cc: Namhyung Kim <namhy...@kernel.org>
Cc: Paul Mackerras <pau...@samba.org>
Cc: Peter Zijlstra <a.p.zijls...@chello.nl>
Signed-off-by: Jiri Olsa <jo...@kernel.org>
---
tools/perf/util/debug.c | 4 +++-
tools/perf/util/debug.h | 1 +
tools/perf/util/ordered-events.c | 44 ++++++++++++++++++++++++++++++++++++++++
3 files changed, 48 insertions(+), 1 deletion(-)
diff --git a/tools/perf/util/debug.c b/tools/perf/util/debug.c
index 71d419362634..5c30f80f6295 100644
--- a/tools/perf/util/debug.c
+++ b/tools/perf/util/debug.c
@@ -15,6 +15,7 @@
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)
{
@@ -110,7 +111,8 @@ 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, }
};
diff --git a/tools/perf/util/debug.h b/tools/perf/util/debug.h
index 89fb6b0f7ab2..69340d3408e2 100644
--- a/tools/perf/util/debug.h
+++ b/tools/perf/util/debug.h
@@ -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
diff --git a/tools/perf/util/ordered-events.c b/tools/perf/util/ordered-events.c
index 6c48dfe24dc4..1a699fc16b92 100644
--- a/tools/perf/util/ordered-events.c
+++ b/tools/perf/util/ordered-events.c
@@ -1,10 +1,27 @@
#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 int pr_time(const char *str, u64 t)
+{
+ u64 secs, usecs, nsecs = t;
+
+ secs = nsecs / NSECS_PER_SEC;
+ nsecs -= secs * NSECS_PER_SEC;
+ usecs = nsecs / NSECS_PER_USEC;
+ return fprintf(stderr, "\t[%13" PRIu64 ".%06" PRIu64 "] %s\n",
+ secs, usecs, str);
+}
+
static void queue_event(struct ordered_events *oe, struct ordered_event *new)
{
struct ordered_event *last = oe->last;
@@ -14,6 +31,9 @@ static void queue_event(struct ordered_events *oe, struct
ordered_event *new)
++oe->nr_events;
oe->last = new;
+ if (unlikely(debug_ordered_events > 1))
+ pr_time("queue_event", timestamp);
+
if (!last) {
list_add(&new->list, &oe->events);
oe->max_timestamp = timestamp;
@@ -69,12 +89,17 @@ 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 +180,11 @@ 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 +214,13 @@ int ordered_events_flush(struct perf_session *s, struct
perf_tool *tool,
break;
};
+ if (unlikely(debug_ordered_events)) {
+ fprintf(stderr, "ordered_events_flush PRE %s, nr_events %u\n",
+ str[how], oe->nr_events);
+ pr_time("next_flush", oe->next_flush);
+ pr_time("max_timestamp", oe->max_timestamp);
+ }
+
err = __ordered_events_flush(s, tool);
if (!err) {
@@ -191,6 +228,13 @@ int ordered_events_flush(struct perf_session *s, struct
perf_tool *tool,
oe->next_flush = oe->max_timestamp;
}
+ if (unlikely(debug_ordered_events)) {
+ fprintf(stderr, "ordered_events_flush POST %s, nr_events %u\n",
+ str[how], oe->nr_events);
+ pr_time("next_flush", oe->next_flush);
+ pr_time("last_flush", oe->last_flush);
+ }
+
return err;
}
--
1.8.3.1
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