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perf util: Add evsel__taskstate() to parse the task state info instead

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Now that we have the __prinf_flags() parsing routines, we add a new
helper evsel__taskstate() to extract the task state info from the
recorded data.

Signed-off-by: Ze Gao <zegao@tencent.com>
Cc: Steven Rostedt <rostedt@goodmis.org>
Link: https://lore.kernel.org/r/20240122070859.1394479-5-zegao@tencent.com
Signed-off-by: Namhyung Kim <namhyung@kernel.org>
This commit is contained in:
Ze Gao 2024-01-22 02:08:58 -05:00 committed by Namhyung Kim
parent 2f29a74f1d
commit df8bc77e4a
2 changed files with 36 additions and 1 deletions
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36
tools/perf/util/evsel.c
View File

@ -2939,7 +2939,7 @@ search_op(struct tep_format_field *prev_state_field, struct tep_print_arg *arg)
return sym;
}
static __maybe_unused const char *get_states(struct tep_format_field *prev_state_field)
static const char *get_states(struct tep_format_field *prev_state_field)
{
struct tep_print_flag_sym *sym;
struct tep_print_arg *arg;
@ -2963,6 +2963,40 @@ static __maybe_unused const char *get_states(struct tep_format_field *prev_state
}
return NULL;
}
char evsel__taskstate(struct evsel *evsel, struct perf_sample *sample, const char *name)
{
static struct tep_format_field *prev_state_field;
static const char *states;
struct tep_format_field *field;
unsigned long long val;
unsigned int bit;
char state = '?'; /* '?' denotes unknown task state */
field = evsel__field(evsel, name);
if (!field)
return state;
if (!states || field != prev_state_field) {
states = get_states(field);
if (!states)
return state;
prev_state_field = field;
}
/*
* Note since the kernel exposes TASK_REPORT_MAX to userspace
* to denote the 'preempted' state, we might as welll report
* 'R' for this case, which make senses to users as well.
*
* We can change this if we have a good reason in the future.
*/
val = evsel__intval(evsel, sample, name);
bit = val ? ffs(val) : 0;
state = (!bit || bit > strlen(states)) ? 'R' : states[bit-1];
return state;
}
#endif
bool evsel__fallback(struct evsel *evsel, struct target *target, int err,

1
tools/perf/util/evsel.h
View File

@ -339,6 +339,7 @@ struct perf_sample;
void *evsel__rawptr(struct evsel *evsel, struct perf_sample *sample, const char *name);
u64 evsel__intval(struct evsel *evsel, struct perf_sample *sample, const char *name);
u64 evsel__intval_common(struct evsel *evsel, struct perf_sample *sample, const char *name);
char evsel__taskstate(struct evsel *evsel, struct perf_sample *sample, const char *name);
static inline char *evsel__strval(struct evsel *evsel, struct perf_sample *sample, const char *name)
{