perf trace/scripting: List available scripts

Lists the available perf trace scripts, one per line e.g.:

root@tropicana:~# perf trace -l
List of available trace scripts:
  workqueue-stats                      workqueue stats (ins/exe/create/destroy)
  wakeup-latency                       system-wide min/max/avg wakeup latency
  rw-by-file <comm>                    r/w activity for a program, by file
  check-perf-trace                     useless but exhaustive test script
  rw-by-pid                            system-wide r/w activity

To be consistent with the other listing options in perf, the
current latency trace option was changed to '-L', and '-l' is
now used to access the script listing as:

To create the list, it searches each scripts/*/bin directory for
files ending with "-report" and reads information found in
certain comment lines contained in those shell scripts:

  - if the comment line starts with "description:", the rest of the
    line is used as a 'half-line' description.  To keep each line in
    the list to a single line, the description should be limited to 40
    characters (the rest of the line contains the script name and
    args)

  - if the comment line starts with "args:", the rest of the line
    names the args the script supports.  Required args should be
    surrounded by <> brackets, optional args by [] brackets.

The current scripts in scripts/perl/bin have also been updated
with description: and args: comments.

Signed-off-by: Tom Zanussi <tzanussi@gmail.com>
Cc: fweisbec@gmail.com
Cc: rostedt@goodmis.org
LKML-Reference: <1260867220-15699-5-git-send-email-tzanussi@gmail.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Tom Zanussi 2009-12-15 02:53:38 -06:00 committed by Ingo Molnar
parent 8f11d85a0e
commit 4b9c0c596e
6 changed files with 204 additions and 1 deletions

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@ -274,6 +274,201 @@ static int parse_scriptname(const struct option *opt __used,
return 0;
}
#define for_each_lang(scripts_dir, lang_dirent, lang_next) \
while (!readdir_r(scripts_dir, &lang_dirent, &lang_next) && \
lang_next) \
if (lang_dirent.d_type == DT_DIR && \
(strcmp(lang_dirent.d_name, ".")) && \
(strcmp(lang_dirent.d_name, "..")))
#define for_each_script(lang_dir, script_dirent, script_next) \
while (!readdir_r(lang_dir, &script_dirent, &script_next) && \
script_next) \
if (script_dirent.d_type != DT_DIR)
#define RECORD_SUFFIX "-record"
#define REPORT_SUFFIX "-report"
struct script_desc {
struct list_head node;
char *name;
char *half_liner;
char *args;
};
LIST_HEAD(script_descs);
static struct script_desc *script_desc__new(const char *name)
{
struct script_desc *s = zalloc(sizeof(*s));
if (s != NULL)
s->name = strdup(name);
return s;
}
static void script_desc__delete(struct script_desc *s)
{
free(s->name);
free(s);
}
static void script_desc__add(struct script_desc *s)
{
list_add_tail(&s->node, &script_descs);
}
static struct script_desc *script_desc__find(const char *name)
{
struct script_desc *s;
list_for_each_entry(s, &script_descs, node)
if (strcasecmp(s->name, name) == 0)
return s;
return NULL;
}
static struct script_desc *script_desc__findnew(const char *name)
{
struct script_desc *s = script_desc__find(name);
if (s)
return s;
s = script_desc__new(name);
if (!s)
goto out_delete_desc;
script_desc__add(s);
return s;
out_delete_desc:
script_desc__delete(s);
return NULL;
}
static char *ends_with(char *str, const char *suffix)
{
size_t suffix_len = strlen(suffix);
char *p = str;
if (strlen(str) > suffix_len) {
p = str + strlen(str) - suffix_len;
if (!strncmp(p, suffix, suffix_len))
return p;
}
return NULL;
}
static char *ltrim(char *str)
{
int len = strlen(str);
while (len && isspace(*str)) {
len--;
str++;
}
return str;
}
static int read_script_info(struct script_desc *desc, const char *filename)
{
char line[BUFSIZ], *p;
FILE *fp;
fp = fopen(filename, "r");
if (!fp)
return -1;
while (fgets(line, sizeof(line), fp)) {
p = ltrim(line);
if (strlen(p) == 0)
continue;
if (*p != '#')
continue;
p++;
if (strlen(p) && *p == '!')
continue;
p = ltrim(p);
if (strlen(p) && p[strlen(p) - 1] == '\n')
p[strlen(p) - 1] = '\0';
if (!strncmp(p, "description:", strlen("description:"))) {
p += strlen("description:");
desc->half_liner = strdup(ltrim(p));
continue;
}
if (!strncmp(p, "args:", strlen("args:"))) {
p += strlen("args:");
desc->args = strdup(ltrim(p));
continue;
}
}
fclose(fp);
return 0;
}
static int list_available_scripts(const struct option *opt __used,
const char *s __used, int unset __used)
{
struct dirent *script_next, *lang_next, script_dirent, lang_dirent;
char scripts_path[MAXPATHLEN];
DIR *scripts_dir, *lang_dir;
char script_path[MAXPATHLEN];
char lang_path[MAXPATHLEN];
struct script_desc *desc;
char first_half[BUFSIZ];
char *script_root;
char *str;
snprintf(scripts_path, MAXPATHLEN, "%s/scripts", perf_exec_path());
scripts_dir = opendir(scripts_path);
if (!scripts_dir)
return -1;
for_each_lang(scripts_dir, lang_dirent, lang_next) {
snprintf(lang_path, MAXPATHLEN, "%s/%s/bin", scripts_path,
lang_dirent.d_name);
lang_dir = opendir(lang_path);
if (!lang_dir)
continue;
for_each_script(lang_dir, script_dirent, script_next) {
script_root = strdup(script_dirent.d_name);
str = ends_with(script_root, REPORT_SUFFIX);
if (str) {
*str = '\0';
desc = script_desc__findnew(script_root);
snprintf(script_path, MAXPATHLEN, "%s/%s",
lang_path, script_dirent.d_name);
read_script_info(desc, script_path);
}
free(script_root);
}
}
fprintf(stdout, "List of available trace scripts:\n");
list_for_each_entry(desc, &script_descs, node) {
sprintf(first_half, "%s %s", desc->name,
desc->args ? desc->args : "");
fprintf(stdout, " %-36s %s\n", first_half,
desc->half_liner ? desc->half_liner : "");
}
exit(0);
}
static const char * const annotate_usage[] = {
"perf trace [<options>] <command>",
NULL
@ -284,8 +479,10 @@ static const struct option options[] = {
"dump raw trace in ASCII"),
OPT_BOOLEAN('v', "verbose", &verbose,
"be more verbose (show symbol address, etc)"),
OPT_BOOLEAN('l', "latency", &latency_format,
OPT_BOOLEAN('L', "Latency", &latency_format,
"show latency attributes (irqs/preemption disabled, etc)"),
OPT_CALLBACK_NOOPT('l', "list", NULL, NULL, "list available scripts",
list_available_scripts),
OPT_CALLBACK('s', "script", NULL, "name",
"script file name (lang:script name, script name, or *)",
parse_scriptname),

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@ -1,4 +1,5 @@
#!/bin/bash
# description: useless but exhaustive test script
perf trace -s ~/libexec/perf-core/scripts/perl/check-perf-trace.pl

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@ -1,4 +1,6 @@
#!/bin/bash
# description: r/w activity for a program, by file
# args: <comm>
perf trace -s ~/libexec/perf-core/scripts/perl/rw-by-file.pl $1

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@ -1,4 +1,5 @@
#!/bin/bash
# description: system-wide r/w activity
perf trace -s ~/libexec/perf-core/scripts/perl/rw-by-pid.pl

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@ -1,4 +1,5 @@
#!/bin/bash
# description: system-wide min/max/avg wakeup latency
perf trace -s ~/libexec/perf-core/scripts/perl/wakeup-latency.pl

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@ -1,4 +1,5 @@
#!/bin/bash
# description: workqueue stats (ins/exe/create/destroy)
perf trace -s ~/libexec/perf-core/scripts/perl/workqueue-stats.pl