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Subject[PATCH 2/9] perf, tools: Add support for text descriptions of events and alias add
Date
From: Andi Kleen <ak@linux.intel.com>

Change pmu.c to allow descriptions of events and add interfaces
to add aliases at runtime from another file. To be used by jevents in the
next patch.

Acked-by: Namhyung Kim <namhyung@kernel.org>
Signed-off-by: Andi Kleen <ak@linux.intel.com>
---
tools/perf/util/pmu.c | 127 ++++++++++++++++++++++++++++++++++++++------------
1 file changed, 98 insertions(+), 29 deletions(-)

diff --git a/tools/perf/util/pmu.c b/tools/perf/util/pmu.c
index 7a811eb..baec090 100644
--- a/tools/perf/util/pmu.c
+++ b/tools/perf/util/pmu.c
@@ -14,6 +14,7 @@

struct perf_pmu_alias {
char *name;
+ char *desc;
struct list_head terms;
struct list_head list;
char unit[UNIT_MAX_LEN+1];
@@ -171,17 +172,12 @@ error:
return -1;
}

-static int perf_pmu__new_alias(struct list_head *list, char *dir, char *name, FILE *file)
+static int __perf_pmu__new_alias(struct list_head *list, char *name,
+ char *dir, char *desc, char *val)
{
struct perf_pmu_alias *alias;
- char buf[256];
int ret;

- ret = fread(buf, 1, sizeof(buf), file);
- if (ret == 0)
- return -EINVAL;
- buf[ret] = 0;
-
alias = malloc(sizeof(*alias));
if (!alias)
return -ENOMEM;
@@ -190,24 +186,45 @@ static int perf_pmu__new_alias(struct list_head *list, char *dir, char *name, FI
alias->scale = 1.0;
alias->unit[0] = '\0';

- ret = parse_events_terms(&alias->terms, buf);
+ ret = parse_events_terms(&alias->terms, val);
if (ret) {
+ pr_err("Cannot parse alias %s: %d\n", val, ret);
free(alias);
return ret;
}

alias->name = strdup(name);
- /*
- * load unit name and scale if available
- */
- perf_pmu__parse_unit(alias, dir, name);
- perf_pmu__parse_scale(alias, dir, name);

+ if (dir) {
+ /*
+ * load unit name and scale if available
+ */
+ perf_pmu__parse_unit(alias, dir, name);
+ perf_pmu__parse_scale(alias, dir, name);
+ }
+
+ alias->desc = desc ? strdup(desc) : NULL;
list_add_tail(&alias->list, list);

return 0;
}

+static int perf_pmu__new_alias(struct list_head *list,
+ char *dir,
+ char *name,
+ FILE *file)
+{
+ char buf[256];
+ int ret;
+
+ ret = fread(buf, 1, sizeof(buf), file);
+ if (ret == 0)
+ return -EINVAL;
+ buf[ret] = 0;
+
+ return __perf_pmu__new_alias(list, name, dir, NULL, buf);
+}
+
/*
* Process all the sysfs attributes located under the directory
* specified in 'dir' parameter.
@@ -720,11 +737,51 @@ static char *format_alias_or(char *buf, int len, struct perf_pmu *pmu,
return buf;
}

-static int cmp_string(const void *a, const void *b)
+struct pair {
+ char *name;
+ char *desc;
+};
+
+static int cmp_pair(const void *a, const void *b)
+{
+ const struct pair *as = a;
+ const struct pair *bs = b;
+
+ /* Put downloaded event list last */
+ if (!!as->desc != !!bs->desc)
+ return !!as->desc - !!bs->desc;
+ return strcmp(as->name, bs->name);
+}
+
+static void wordwrap(char *s, int start, int max, int corr)
{
- const char * const *as = a;
- const char * const *bs = b;
- return strcmp(*as, *bs);
+ int column = start;
+ int n;
+
+ while (*s) {
+ int wlen = strcspn(s, " \t");
+
+ if (column + wlen >= max && column > start) {
+ printf("\n%*s", start, "");
+ column = start + corr;
+ }
+ n = printf("%s%.*s", column > start ? " " : "", wlen, s);
+ if (n <= 0)
+ break;
+ s += wlen;
+ column += n;
+ while (isspace(*s))
+ s++;
+ }
+}
+
+static int get_columns(void)
+{
+ /*
+ * Should ask the terminal with TIOCGWINSZ here, but we
+ * need the original fd before the pager.
+ */
+ return 79;
}

void print_pmu_events(const char *event_glob, bool name_only)
@@ -734,21 +791,24 @@ void print_pmu_events(const char *event_glob, bool name_only)
char buf[1024];
int printed = 0;
int len, j;
- char **aliases;
+ struct pair *aliases;
+ int numdesc = 0;
+ int columns = get_columns();

pmu = NULL;
len = 0;
while ((pmu = perf_pmu__scan(pmu)) != NULL)
list_for_each_entry(alias, &pmu->aliases, list)
len++;
- aliases = malloc(sizeof(char *) * len);
+ aliases = malloc(sizeof(struct pair) * len);
if (!aliases)
return;
pmu = NULL;
j = 0;
while ((pmu = perf_pmu__scan(pmu)) != NULL)
list_for_each_entry(alias, &pmu->aliases, list) {
- char *name = format_alias(buf, sizeof(buf), pmu, alias);
+ char *name = alias->desc ? alias->name :
+ format_alias(buf, sizeof(buf), pmu, alias);
bool is_cpu = !strcmp(pmu->name, "cpu");

if (event_glob != NULL &&
@@ -756,22 +816,31 @@ void print_pmu_events(const char *event_glob, bool name_only)
(!is_cpu && strglobmatch(alias->name,
event_glob))))
continue;
- aliases[j] = name;
- if (is_cpu && !name_only)
- aliases[j] = format_alias_or(buf, sizeof(buf),
- pmu, alias);
- aliases[j] = strdup(aliases[j]);
+ aliases[j].name = name;
+ if (is_cpu && !name_only && !alias->desc)
+ aliases[j].name = format_alias_or(buf,
+ sizeof(buf),
+ pmu, alias);
+ aliases[j].name = strdup(aliases[j].name);
+ aliases[j].desc = alias->desc;
j++;
}
len = j;
- qsort(aliases, len, sizeof(char *), cmp_string);
+ qsort(aliases, len, sizeof(struct pair), cmp_pair);
for (j = 0; j < len; j++) {
if (name_only) {
- printf("%s ", aliases[j]);
+ printf("%s ", aliases[j].name);
continue;
}
- printf(" %-50s [Kernel PMU event]\n", aliases[j]);
- zfree(&aliases[j]);
+ if (aliases[j].desc) {
+ if (numdesc++ == 0 && printed)
+ printf("\n");
+ printf(" %-50s [", aliases[j].name);
+ wordwrap(aliases[j].desc, 53, columns, 1);
+ printf("]\n");
+ } else
+ printf(" %-50s [Kernel PMU event]\n", aliases[j].name);
+ zfree(&aliases[j].name);
printed++;
}
if (printed)
--
1.9.3


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