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Subject[PATCH v9 03/11] perf, tools, list: Update perf list to output descriptions
Date
From: Andi Kleen <ak@linux.intel.com>

Add support to perf list to print aliases with descriptions.
Support word wrapping for descriptions.
Fix up the sorting code to put aliases with descriptions
last.

Signed-off-by: Andi Kleen <ak@linux.intel.com>
Signed-off-by: Sukadev Bhattiprolu <sukadev@linux.vnet.ibm.com>
---

Changelov[v9] by Sukadev Bhattiprolu
Rebase to 4.0 and fix conflicts in tools/perf/util/pmu.c
---
tools/perf/util/pmu.c | 86 ++++++++++++++++++++++++++++++++++++++++---------
1 file changed, 70 insertions(+), 16 deletions(-)

diff --git a/tools/perf/util/pmu.c b/tools/perf/util/pmu.c
index 527da74..623b107 100644
--- a/tools/perf/util/pmu.c
+++ b/tools/perf/util/pmu.c
@@ -877,11 +877,51 @@ 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 char * const *as = a;
- const char * const *bs = b;
- return strcmp(*as, *bs);
+ 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)
+{
+ 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)
@@ -891,7 +931,9 @@ 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;
@@ -901,14 +943,15 @@ void print_pmu_events(const char *event_glob, bool name_only)
if (pmu->selectable)
len++;
}
- aliases = zalloc(sizeof(char *) * len);
+ aliases = zalloc(sizeof(struct pair) * len);
if (!aliases)
goto out_enomem;
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 &&
@@ -917,11 +960,14 @@ void print_pmu_events(const char *event_glob, bool name_only)
event_glob))))
continue;

- if (is_cpu && !name_only)
- name = format_alias_or(buf, sizeof(buf), pmu, alias);
+ aliases[j].name = name;
+ if (is_cpu && !name_only && !alias->desc)
+ aliases[j].name = format_alias_or(buf,
+ sizeof(buf), pmu, alias);

- aliases[j] = strdup(name);
- if (aliases[j] == NULL)
+ aliases[j].name = strdup(aliases[j].name);
+ aliases[j].desc = alias->desc;
+ if (aliases[j].name == NULL)
goto out_enomem;
j++;
}
@@ -929,25 +975,33 @@ void print_pmu_events(const char *event_glob, bool name_only)
char *s;
if (asprintf(&s, "%s//", pmu->name) < 0)
goto out_enomem;
- aliases[j] = s;
+ aliases[j].name = s;
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]);
+ 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)
printf("\n");
out_free:
for (j = 0; j < len; j++)
- zfree(&aliases[j]);
+ zfree(&aliases[j].name);
zfree(&aliases);
return;

--
1.7.9.5


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