[PATCH] perf timechart: dynamically determine event data offset
From: Stanislav Fomichev
Date: Tue Nov 26 2013 - 09:54:54 EST
Since b000c8065a92 "tracing: Remove the extra 4 bytes of padding in events"
removed padding bytes, perf timechart got out of sync with the kernel's
trace_entry structure.
We can't just align perf's trace_entry definition with the kernel because we
want timechart to continue working with old perf.data. Instead, we now
calculate event data offset dynamically using offset of first non-common
event field in the perf.data.
Signed-off-by: Stanislav Fomichev <stfomichev@xxxxxxxxxxxxxx>
---
tools/perf/builtin-timechart.c | 56 +++++++++++++++++++++++++++---------------
tools/perf/util/evsel.c | 5 ++++
tools/perf/util/evsel.h | 1 +
3 files changed, 42 insertions(+), 20 deletions(-)
diff --git a/tools/perf/builtin-timechart.c b/tools/perf/builtin-timechart.c
index 41c9bde2fb67..5c76a914031b 100644
--- a/tools/perf/builtin-timechart.c
+++ b/tools/perf/builtin-timechart.c
@@ -41,6 +41,24 @@
#define SUPPORT_OLD_POWER_EVENTS 1
#define PWR_EVENT_EXIT -1
+static unsigned int payload_offset;
+
+static int timechart__set_payload_offset(struct perf_evlist *evlist)
+{
+ struct perf_evsel *evsel = perf_evlist__first(evlist);
+ struct format_field *field = perf_evsel__fields(evsel);
+
+ if (!field)
+ return -1;
+
+ payload_offset = field->offset;
+ return 0;
+}
+
+static void *timechart__payload(struct perf_sample *sample)
+{
+ return sample->raw_data + payload_offset;
+}
static unsigned int numcpus;
static u64 min_freq; /* Lowest CPU frequency seen */
@@ -304,13 +322,11 @@ struct trace_entry {
unsigned char flags;
unsigned char preempt_count;
int pid;
- int lock_depth;
};
#ifdef SUPPORT_OLD_POWER_EVENTS
static int use_old_power_events;
struct power_entry_old {
- struct trace_entry te;
u64 type;
u64 value;
u64 cpu_id;
@@ -318,14 +334,12 @@ struct power_entry_old {
#endif
struct power_processor_entry {
- struct trace_entry te;
u32 state;
u32 cpu_id;
};
#define TASK_COMM_LEN 16
struct wakeup_entry {
- struct trace_entry te;
char comm[TASK_COMM_LEN];
int pid;
int prio;
@@ -333,7 +347,6 @@ struct wakeup_entry {
};
struct sched_switch {
- struct trace_entry te;
char prev_comm[TASK_COMM_LEN];
int prev_pid;
int prev_prio;
@@ -402,11 +415,13 @@ static void p_state_change(int cpu, u64 timestamp, u64 new_freq)
turbo_frequency = max_freq;
}
-static void
-sched_wakeup(int cpu, u64 timestamp, int pid, struct trace_entry *te)
+static void sched_wakeup(struct perf_sample *sample)
{
+ struct trace_entry *te = sample->raw_data;
+ struct wakeup_entry *wake = timechart__payload(sample);
+ u64 timestamp = sample->time;
+ int pid = sample->pid, cpu = sample->cpu;
struct per_pid *p;
- struct wakeup_entry *wake = (void *)te;
struct wake_event *we = zalloc(sizeof(*we));
if (!we)
@@ -434,11 +449,9 @@ sched_wakeup(int cpu, u64 timestamp, int pid, struct trace_entry *te)
}
}
-static void sched_switch(int cpu, u64 timestamp, struct trace_entry *te)
+static void sched_switch(int cpu, u64 timestamp, struct sched_switch *sw)
{
struct per_pid *p = NULL, *prev_p;
- struct sched_switch *sw = (void *)te;
-
prev_p = find_create_pid(sw->prev_pid);
@@ -495,7 +508,7 @@ static int
process_sample_cpu_idle(struct perf_evsel *evsel __maybe_unused,
struct perf_sample *sample)
{
- struct power_processor_entry *ppe = sample->raw_data;
+ struct power_processor_entry *ppe = timechart__payload(sample);
if (ppe->state == (u32) PWR_EVENT_EXIT)
c_state_end(ppe->cpu_id, sample->time);
@@ -508,7 +521,7 @@ static int
process_sample_cpu_frequency(struct perf_evsel *evsel __maybe_unused,
struct perf_sample *sample)
{
- struct power_processor_entry *ppe = sample->raw_data;
+ struct power_processor_entry *ppe = timechart__payload(sample);
p_state_change(ppe->cpu_id, sample->time, ppe->state);
return 0;
@@ -518,9 +531,7 @@ static int
process_sample_sched_wakeup(struct perf_evsel *evsel __maybe_unused,
struct perf_sample *sample)
{
- struct trace_entry *te = sample->raw_data;
-
- sched_wakeup(sample->cpu, sample->time, sample->pid, te);
+ sched_wakeup(sample);
return 0;
}
@@ -528,9 +539,9 @@ static int
process_sample_sched_switch(struct perf_evsel *evsel __maybe_unused,
struct perf_sample *sample)
{
- struct trace_entry *te = sample->raw_data;
+ struct sched_switch *sw = timechart__payload(sample);
- sched_switch(sample->cpu, sample->time, te);
+ sched_switch(sample->cpu, sample->time, sw);
return 0;
}
@@ -539,7 +550,7 @@ static int
process_sample_power_start(struct perf_evsel *evsel __maybe_unused,
struct perf_sample *sample)
{
- struct power_entry_old *peo = sample->raw_data;
+ struct power_entry_old *peo = timechart__payload(sample);
c_state_start(peo->cpu_id, sample->time, peo->value);
return 0;
@@ -557,7 +568,7 @@ static int
process_sample_power_frequency(struct perf_evsel *evsel __maybe_unused,
struct perf_sample *sample)
{
- struct power_entry_old *peo = sample->raw_data;
+ struct power_entry_old *peo = timechart__payload(sample);
p_state_change(peo->cpu_id, sample->time, peo->value);
return 0;
@@ -1012,6 +1023,11 @@ static int __cmd_timechart(const char *output_name)
goto out_delete;
}
+ if (timechart__set_payload_offset(session->evlist)) {
+ pr_err("Field format not found, please try updating this tool\n");
+ goto out_delete;
+ }
+
ret = perf_session__process_events(session, &perf_timechart);
if (ret)
goto out_delete;
diff --git a/tools/perf/util/evsel.c b/tools/perf/util/evsel.c
index 46dd4c2a41ce..4847d373fe2a 100644
--- a/tools/perf/util/evsel.c
+++ b/tools/perf/util/evsel.c
@@ -1767,6 +1767,11 @@ struct format_field *perf_evsel__field(struct perf_evsel *evsel, const char *nam
return pevent_find_field(evsel->tp_format, name);
}
+struct format_field *perf_evsel__fields(struct perf_evsel *evsel)
+{
+ return evsel->tp_format->format.fields;
+}
+
void *perf_evsel__rawptr(struct perf_evsel *evsel, struct perf_sample *sample,
const char *name)
{
diff --git a/tools/perf/util/evsel.h b/tools/perf/util/evsel.h
index 1ea7c92e6e33..3d50dc01bb1d 100644
--- a/tools/perf/util/evsel.h
+++ b/tools/perf/util/evsel.h
@@ -193,6 +193,7 @@ static inline char *perf_evsel__strval(struct perf_evsel *evsel,
struct format_field;
struct format_field *perf_evsel__field(struct perf_evsel *evsel, const char *name);
+struct format_field *perf_evsel__fields(struct perf_evsel *evsel);
#define perf_evsel__match(evsel, t, c) \
(evsel->attr.type == PERF_TYPE_##t && \
--
1.8.3.2
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