[tip:perf/core] perf tools: Add parse_events_error interface

tip-bot for Jiri Olsa
2015-05-06T03:04:39Z

Commit-ID: b39b839309ce8c5dd15cd95d26af153fa392c3e6
Gitweb: http://git.kernel.org/tip/b39b839309ce8c5dd15cd95d26af153fa392c3e6
Author: Jiri Olsa <jolsa@kernel.org>
AuthorDate: Wed, 22 Apr 2015 21:10:16 +0200
Committer: Arnaldo Carvalho de Melo <acme@redhat.com>
CommitDate: Wed, 29 Apr 2015 10:37:58 -0300

perf tools: Add parse_events_error interface

Adding support to return error information from parse_events function.
Following struct will be populated by parse_events function on return:

struct parse_events_error {
int idx;
char *str;
char *help;
};

where 'idx' is the position in the string where the parsing failed,
'str' contains dynamically allocated error string describing the error
and 'help' is optional help string.

The change contains reporting function, which currently does not display
anything. The code changes to supply error data for specific event types
are coming in next patches. However this is what the expected output is:

$ sudo perf record -e 'sched:krava' ls
event syntax error: 'sched:krava'
\___ unknown tracepoint
...

$ perf record -e 'cpu/even=0x1/' ls
event syntax error: 'cpu/even=0x1/'
\___ unknown term

valid terms: pc,any,inv,edge,cmask,event,in_tx,ldlat,umask,in_tx_cp,offcore_rsp,config,config1,config2,name,period,branch_type
...

$ perf record -e cycles,cache-mises ls
event syntax error: '..es,cache-mises'
\___ parser error
...

The output functions cut the beginning of the event string so the error
starts up to 10th character and cut the end of the string of it crosses
the terminal width.

Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Cc: David Ahern <dsahern@gmail.com>
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/r/1429729824-13932-2-git-send-email-jolsa@kernel.org
[ Renamed 'error' variables to 'err', not to clash with util.h error() ]
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
---
tools/perf/builtin-stat.c | 2 +-
tools/perf/tests/code-reading.c | 2 +-
tools/perf/tests/evsel-roundtrip-name.c | 4 +-
tools/perf/tests/hists_cumulate.c | 2 +-
tools/perf/tests/hists_filter.c | 4 +-
tools/perf/tests/hists_link.c | 4 +-
tools/perf/tests/hists_output.c | 2 +-
tools/perf/tests/keep-tracking.c | 4 +-
tools/perf/tests/parse-events.c | 2 +-
tools/perf/tests/perf-time-to-tsc.c | 2 +-
tools/perf/tests/switch-tracking.c | 8 +--
tools/perf/util/parse-events.c | 100 +++++++++++++++++++++++++++++---
tools/perf/util/parse-events.h | 19 ++++--
tools/perf/util/record.c | 4 +-
14 files changed, 127 insertions(+), 32 deletions(-)

diff --git a/tools/perf/builtin-stat.c b/tools/perf/builtin-stat.c
index f7b8218..3dbd8c5 100644
--- a/tools/perf/builtin-stat.c
+++ b/tools/perf/builtin-stat.c
@@ -1541,7 +1541,7 @@ static int setup_events(const char * const *attrs, unsigned len)
unsigned i;

for (i = 0; i < len; i++) {
- if (parse_events(evsel_list, attrs[i]))
+ if (parse_events(evsel_list, attrs[i], NULL))
return -1;
}
return 0;
diff --git a/tools/perf/tests/code-reading.c b/tools/perf/tests/code-reading.c
index f671ec3..ca0e480 100644
--- a/tools/perf/tests/code-reading.c
+++ b/tools/perf/tests/code-reading.c
@@ -482,7 +482,7 @@ static int do_test_code_reading(bool try_kcore)
else
str = "cycles";
pr_debug("Parsing event '%s'\n", str);
- ret = parse_events(evlist, str);
+ ret = parse_events(evlist, str, NULL);
if (ret < 0) {
pr_debug("parse_events failed\n");
goto out_err;
diff --git a/tools/perf/tests/evsel-roundtrip-name.c b/tools/perf/tests/evsel-roundtrip-name.c
index b8d8341..3fa7159 100644
--- a/tools/perf/tests/evsel-roundtrip-name.c
+++ b/tools/perf/tests/evsel-roundtrip-name.c
@@ -23,7 +23,7 @@ static int perf_evsel__roundtrip_cache_name_test(void)
for (i = 0; i < PERF_COUNT_HW_CACHE_RESULT_MAX; i++) {
__perf_evsel__hw_cache_type_op_res_name(type, op, i,
name, sizeof(name));
- err = parse_events(evlist, name);
+ err = parse_events(evlist, name, NULL);
if (err)
ret = err;
}
@@ -71,7 +71,7 @@ static int __perf_evsel__name_array_test(const char *names[], int nr_names)
return -ENOMEM;

for (i = 0; i < nr_names; ++i) {
- err = parse_events(evlist, names[i]);
+ err = parse_events(evlist, names[i], NULL);
if (err) {
pr_debug("failed to parse event '%s', err %d\n",
names[i], err);
diff --git a/tools/perf/tests/hists_cumulate.c b/tools/perf/tests/hists_cumulate.c
index 1861996..b08a95a 100644
--- a/tools/perf/tests/hists_cumulate.c
+++ b/tools/perf/tests/hists_cumulate.c
@@ -695,7 +695,7 @@ int test__hists_cumulate(void)

TEST_ASSERT_VAL("No memory", evlist);

- err = parse_events(evlist, "cpu-clock");
+ err = parse_events(evlist, "cpu-clock", NULL);
if (err)
goto out;

diff --git a/tools/perf/tests/hists_filter.c b/tools/perf/tests/hists_filter.c
index 59e53db..108488c 100644
--- a/tools/perf/tests/hists_filter.c
+++ b/tools/perf/tests/hists_filter.c
@@ -108,10 +108,10 @@ int test__hists_filter(void)

TEST_ASSERT_VAL("No memory", evlist);

- err = parse_events(evlist, "cpu-clock");
+ err = parse_events(evlist, "cpu-clock", NULL);
if (err)
goto out;
- err = parse_events(evlist, "task-clock");
+ err = parse_events(evlist, "task-clock", NULL);
if (err)
goto out;

diff --git a/tools/perf/tests/hists_link.c b/tools/perf/tests/hists_link.c
index 278ba834..34c61e4 100644
--- a/tools/perf/tests/hists_link.c
+++ b/tools/perf/tests/hists_link.c
@@ -282,10 +282,10 @@ int test__hists_link(void)
if (evlist == NULL)
return -ENOMEM;

- err = parse_events(evlist, "cpu-clock");
+ err = parse_events(evlist, "cpu-clock", NULL);
if (err)
goto out;
- err = parse_events(evlist, "task-clock");
+ err = parse_events(evlist, "task-clock", NULL);
if (err)
goto out;

diff --git a/tools/perf/tests/hists_output.c b/tools/perf/tests/hists_output.c
index b52c9fa..d8a23db 100644
--- a/tools/perf/tests/hists_output.c
+++ b/tools/perf/tests/hists_output.c
@@ -590,7 +590,7 @@ int test__hists_output(void)

TEST_ASSERT_VAL("No memory", evlist);

- err = parse_events(evlist, "cpu-clock");
+ err = parse_events(evlist, "cpu-clock", NULL);
if (err)
goto out;

diff --git a/tools/perf/tests/keep-tracking.c b/tools/perf/tests/keep-tracking.c
index 7a5ab7b..5b171d1 100644
--- a/tools/perf/tests/keep-tracking.c
+++ b/tools/perf/tests/keep-tracking.c
@@ -78,8 +78,8 @@ int test__keep_tracking(void)

perf_evlist__set_maps(evlist, cpus, threads);

- CHECK__(parse_events(evlist, "dummy:u"));
- CHECK__(parse_events(evlist, "cycles:u"));
+ CHECK__(parse_events(evlist, "dummy:u", NULL));
+ CHECK__(parse_events(evlist, "cycles:u", NULL));

perf_evlist__config(evlist, &opts);

diff --git a/tools/perf/tests/parse-events.c b/tools/perf/tests/parse-events.c
index 3de7449..82d2a16 100644
--- a/tools/perf/tests/parse-events.c
+++ b/tools/perf/tests/parse-events.c
@@ -1571,7 +1571,7 @@ static int test_event(struct evlist_test *e)
if (evlist == NULL)
return -ENOMEM;

- ret = parse_events(evlist, e->name);
+ ret = parse_events(evlist, e->name, NULL);
if (ret) {
pr_debug("failed to parse event '%s', err %d\n",
e->name, ret);
diff --git a/tools/perf/tests/perf-time-to-tsc.c b/tools/perf/tests/perf-time-to-tsc.c
index f238442..5f49484 100644
--- a/tools/perf/tests/perf-time-to-tsc.c
+++ b/tools/perf/tests/perf-time-to-tsc.c
@@ -68,7 +68,7 @@ int test__perf_time_to_tsc(void)

perf_evlist__set_maps(evlist, cpus, threads);

- CHECK__(parse_events(evlist, "cycles:u"));
+ CHECK__(parse_events(evlist, "cycles:u", NULL));

perf_evlist__config(evlist, &opts);

diff --git a/tools/perf/tests/switch-tracking.c b/tools/perf/tests/switch-tracking.c
index cc68648..0d31403 100644
--- a/tools/perf/tests/switch-tracking.c
+++ b/tools/perf/tests/switch-tracking.c
@@ -347,7 +347,7 @@ int test__switch_tracking(void)
perf_evlist__set_maps(evlist, cpus, threads);

/* First event */
- err = parse_events(evlist, "cpu-clock:u");
+ err = parse_events(evlist, "cpu-clock:u", NULL);
if (err) {
pr_debug("Failed to parse event dummy:u\n");
goto out_err;
@@ -356,7 +356,7 @@ int test__switch_tracking(void)
cpu_clocks_evsel = perf_evlist__last(evlist);

/* Second event */
- err = parse_events(evlist, "cycles:u");
+ err = parse_events(evlist, "cycles:u", NULL);
if (err) {
pr_debug("Failed to parse event cycles:u\n");
goto out_err;
@@ -371,7 +371,7 @@ int test__switch_tracking(void)
goto out;
}

- err = parse_events(evlist, sched_switch);
+ err = parse_events(evlist, sched_switch, NULL);
if (err) {
pr_debug("Failed to parse event %s\n", sched_switch);
goto out_err;
@@ -401,7 +401,7 @@ int test__switch_tracking(void)
perf_evsel__set_sample_bit(cycles_evsel, TIME);

/* Fourth event */
- err = parse_events(evlist, "dummy:u");
+ err = parse_events(evlist, "dummy:u", NULL);
if (err) {
pr_debug("Failed to parse event dummy:u\n");
goto out_err;
diff --git a/tools/perf/util/parse-events.c b/tools/perf/util/parse-events.c
index be06553..6978cc3 100644
--- a/tools/perf/util/parse-events.c
+++ b/tools/perf/util/parse-events.c
@@ -17,6 +17,7 @@
#include "parse-events-flex.h"
#include "pmu.h"
#include "thread_map.h"
+#include "asm/bug.h"

#define MAX_NAME_LEN 100

@@ -1019,11 +1020,13 @@ int parse_events_terms(struct list_head *terms, const char *str)
return ret;
}

-int parse_events(struct perf_evlist *evlist, const char *str)
+int parse_events(struct perf_evlist *evlist, const char *str,
+ struct parse_events_error *err)
{
struct parse_events_evlist data = {
- .list = LIST_HEAD_INIT(data.list),
- .idx = evlist->nr_entries,
+ .list = LIST_HEAD_INIT(data.list),
+ .idx = evlist->nr_entries,
+ .error = err,
};
int ret;

@@ -1044,16 +1047,87 @@ int parse_events(struct perf_evlist *evlist, const char *str)
return ret;
}

+#define MAX_WIDTH 1000
+static int get_term_width(void)
+{
+ struct winsize ws;
+
+ get_term_dimensions(&ws);
+ return ws.ws_col > MAX_WIDTH ? MAX_WIDTH : ws.ws_col;
+}
+
+static void parse_events_print_error(struct parse_events_error *err,
+ const char *event)
+{
+ const char *str = "invalid or unsupported event: ";
+ char _buf[MAX_WIDTH];
+ char *buf = (char *) event;
+ int idx = 0;
+
+ if (err->str) {
+ /* -2 for extra '' in the final fprintf */
+ int width = get_term_width() - 2;
+ int len_event = strlen(event);
+ int len_str, max_len, cut = 0;
+
+ /*
+ * Maximum error index indent, we will cut
+ * the event string if it's bigger.
+ */
+ int max_err_idx = 10;
+
+ /*
+ * Let's be specific with the message when
+ * we have the precise error.
+ */
+ str = "event syntax error: ";
+ len_str = strlen(str);
+ max_len = width - len_str;
+
+ buf = _buf;
+
+ /* We're cutting from the beggining. */
+ if (err->idx > max_err_idx)
+ cut = err->idx - max_err_idx;
+
+ strncpy(buf, event + cut, max_len);
+
+ /* Mark cut parts with '..' on both sides. */
+ if (cut)
+ buf[0] = buf[1] = '.';
+
+ if ((len_event - cut) > max_len) {
+ buf[max_len - 1] = buf[max_len - 2] = '.';
+ buf[max_len] = 0;
+ }
+
+ idx = len_str + err->idx - cut;
+ }
+
+ fprintf(stderr, "%s'%s'\n", str, buf);
+ if (idx) {
+ fprintf(stderr, "%*s\\___ %s\n", idx + 1, "", err->str);
+ if (err->help)
+ fprintf(stderr, "\n%s\n", err->help);
+ free(err->str);
+ free(err->help);
+ }
+
+ fprintf(stderr, "Run 'perf list' for a list of valid events\n");
+}
+
+#undef MAX_WIDTH
+
int parse_events_option(const struct option *opt, const char *str,
int unset __maybe_unused)
{
struct perf_evlist *evlist = *(struct perf_evlist **)opt->value;
- int ret = parse_events(evlist, str);
+ struct parse_events_error err = { .idx = 0, };
+ int ret = parse_events(evlist, str, &err);
+
+ if (ret)
+ parse_events_print_error(&err, str);

- if (ret) {
- fprintf(stderr, "invalid or unsupported event: '%s'\n", str);
- fprintf(stderr, "Run 'perf list' for a list of valid events\n");
- }
return ret;
}

@@ -1535,3 +1609,13 @@ void parse_events__free_terms(struct list_head *terms)
list_for_each_entry_safe(term, h, terms, list)
free(term);
}
+
+void parse_events_evlist_error(struct parse_events_evlist *data,
+ int idx, const char *str)
+{
+ struct parse_events_error *err = data->error;
+
+ err->idx = idx;
+ err->str = strdup(str);
+ WARN_ONCE(!err->str, "WARNING: failed to allocate error string");
+}
diff --git a/tools/perf/util/parse-events.h b/tools/perf/util/parse-events.h
index 52a2dda..5ac2ffa0 100644
--- a/tools/perf/util/parse-events.h
+++ b/tools/perf/util/parse-events.h
@@ -12,6 +12,7 @@
struct list_head;
struct perf_evsel;
struct perf_evlist;
+struct parse_events_error;

struct option;

@@ -29,7 +30,8 @@ const char *event_type(int type);

extern int parse_events_option(const struct option *opt, const char *str,
int unset);
-extern int parse_events(struct perf_evlist *evlist, const char *str);
+extern int parse_events(struct perf_evlist *evlist, const char *str,
+ struct parse_events_error *error);
extern int parse_events_terms(struct list_head *terms, const char *str);
extern int parse_filter(const struct option *opt, const char *str, int unset);

@@ -74,10 +76,17 @@ struct parse_events_term {
bool used;
};

+struct parse_events_error {
+ int idx; /* index in the parsed string */
+ char *str; /* string to display at the index */
+ char *help; /* optional help string */
+};
+
struct parse_events_evlist {
- struct list_head list;
- int idx;
- int nr_groups;
+ struct list_head list;
+ int idx;
+ int nr_groups;
+ struct parse_events_error *error;
};

struct parse_events_terms {
@@ -114,6 +123,8 @@ void parse_events__set_leader(char *name, struct list_head *list);
void parse_events_update_lists(struct list_head *list_event,
struct list_head *list_all);
void parse_events_error(void *data, void *scanner, char const *msg);
+void parse_events_evlist_error(struct parse_events_evlist *data,
+ int idx, const char *str);

void print_events(const char *event_glob, bool name_only);

diff --git a/tools/perf/util/record.c b/tools/perf/util/record.c
index 0ccfa49..d457c52 100644
--- a/tools/perf/util/record.c
+++ b/tools/perf/util/record.c
@@ -20,7 +20,7 @@ static int perf_do_probe_api(setup_probe_fn_t fn, int cpu, const char *str)
if (!evlist)
return -ENOMEM;

- if (parse_events(evlist, str))
+ if (parse_events(evlist, str, NULL))
goto out_delete;

evsel = perf_evlist__first(evlist);
@@ -216,7 +216,7 @@ bool perf_evlist__can_select_event(struct perf_evlist *evlist, const char *str)
if (!temp_evlist)
return false;

- err = parse_events(temp_evlist, str);
+ err = parse_events(temp_evlist, str, NULL);
if (err)
goto out_delete;