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perf probe: Support --del option

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Support perf probe --del <event> option. Currently,
perf probe can have only one event for each --del option.
If you'd like to delete several probe events, you need
to specify --del for each events.

Signed-off-by: Masami Hiramatsu <mhiramat@redhat.com>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Jim Keniston <jkenisto@us.ibm.com>
Cc: Ananth N Mavinakayanahalli <ananth@in.ibm.com>
Cc: Christoph Hellwig <hch@infradead.org>
Cc: Frank Ch. Eigler <fche@redhat.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Jason Baron <jbaron@redhat.com>
Cc: K.Prasad <prasad@linux.vnet.ibm.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Srikar Dronamraju <srikar@linux.vnet.ibm.com>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: systemtap <systemtap@sources.redhat.com>
Cc: DLE <dle-develop@lists.sourceforge.net>
LKML-Reference: <20091208220323.10142.62079.stgit@dhcp-100-2-132.bos.redhat.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Masami Hiramatsu 2009-12-08 17:03:23 -05:00 committed by Ingo Molnar
parent a7c312bed7
commit fa28244d12
3 changed files with 96 additions and 7 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

33
tools/perf/builtin-probe.c
View file

@ -35,6 +35,7 @@
#include "perf.h"
#include "builtin.h"
#include "util/util.h"
#include "util/strlist.h"
#include "util/event.h"
#include "util/debug.h"
#include "util/parse-options.h"
@ -61,6 +62,7 @@ static struct {
int need_dwarf;
int nr_probe;
struct probe_point probes[MAX_PROBES];
struct strlist *dellist;
} session;
static bool listing;
@ -107,6 +109,17 @@ static int opt_add_probe_event(const struct option *opt __used,
return 0;
}
static int opt_del_probe_event(const struct option *opt __used,
const char *str, int unset __used)
{
if (str) {
if (!session.dellist)
session.dellist = strlist__new(true, NULL);
strlist__add(session.dellist, str);
}
return 0;
}
#ifndef NO_LIBDWARF
static int open_default_vmlinux(void)
{
@ -141,6 +154,7 @@ static int open_default_vmlinux(void)
static const char * const probe_usage[] = {
"perf probe [<options>] 'PROBEDEF' ['PROBEDEF' ...]",
"perf probe [<options>] --add 'PROBEDEF' [--add 'PROBEDEF' ...]",
"perf probe [<options>] --del '[GROUP:]EVENT' ...",
"perf probe --list",
NULL
};
@ -152,7 +166,9 @@ static const struct option options[] = {
OPT_STRING('k', "vmlinux", &session.vmlinux, "file",
"vmlinux/module pathname"),
#endif
OPT_BOOLEAN('l', "list", &listing, "list up current probes"),
OPT_BOOLEAN('l', "list", &listing, "list up current probe events"),
OPT_CALLBACK('d', "del", NULL, "[GROUP:]EVENT", "delete a probe event.",
opt_del_probe_event),
OPT_CALLBACK('a', "add", NULL,
#ifdef NO_LIBDWARF
"FUNC[+OFFS|%return] [ARG ...]",
@ -191,15 +207,26 @@ int cmd_probe(int argc, const char **argv, const char *prefix __used)
if (argc > 0)
parse_probe_event_argv(argc, argv);
if ((session.nr_probe == 0 && !listing) ||
(session.nr_probe != 0 && listing))
if ((session.nr_probe == 0 && !session.dellist && !listing))
usage_with_options(probe_usage, options);
if (listing) {
if (session.nr_probe != 0 || session.dellist) {
pr_warning(" Error: Don't use --list with"
" --add/--del.\n");
usage_with_options(probe_usage, options);
}
show_perf_probe_events();
return 0;
}
if (session.dellist) {
del_trace_kprobe_events(session.dellist);
strlist__delete(session.dellist);
if (session.nr_probe == 0)
return 0;
}
if (session.need_dwarf)
#ifdef NO_LIBDWARF
die("Debuginfo-analysis is not supported");

69
tools/perf/util/probe-event.c
View file

@ -430,10 +430,11 @@ void show_perf_probe_events(void)
}
/* Get current perf-probe event names */
static struct strlist *get_perf_event_names(int fd)
static struct strlist *get_perf_event_names(int fd, bool include_group)
{
unsigned int i;
char *group, *event;
char buf[128];
struct strlist *sl, *rawlist;
struct str_node *ent;
@ -443,7 +444,12 @@ static struct strlist *get_perf_event_names(int fd)
for (i = 0; i < strlist__nr_entries(rawlist); i++) {
ent = strlist__entry(rawlist, i);
parse_trace_kprobe_event(ent->s, &group, &event, NULL);
strlist__add(sl, event);
if (include_group) {
if (e_snprintf(buf, 128, "%s:%s", group, event) < 0)
die("Failed to copy group:event name.");
strlist__add(sl, buf);
} else
strlist__add(sl, event);
free(group);
free(event);
}
@ -457,9 +463,10 @@ static void write_trace_kprobe_event(int fd, const char *buf)
{
int ret;
pr_debug("Writing event: %s\n", buf);
ret = write(fd, buf, strlen(buf));
if (ret <= 0)
die("Failed to create event.");
die("Failed to write event: %s", strerror(errno));
}
static void get_new_event_name(char *buf, size_t len, const char *base,
@ -496,7 +503,7 @@ void add_trace_kprobe_events(struct probe_point *probes, int nr_probes)
fd = open_kprobe_events(O_RDWR, O_APPEND);
/* Get current event names */
namelist = get_perf_event_names(fd);
namelist = get_perf_event_names(fd, false);
for (j = 0; j < nr_probes; j++) {
pp = probes + j;
@ -524,3 +531,57 @@ void add_trace_kprobe_events(struct probe_point *probes, int nr_probes)
strlist__delete(namelist);
close(fd);
}
static void del_trace_kprobe_event(int fd, const char *group,
const char *event, struct strlist *namelist)
{
char buf[128];
if (e_snprintf(buf, 128, "%s:%s", group, event) < 0)
die("Failed to copy event.");
if (!strlist__has_entry(namelist, buf)) {
pr_warning("Warning: event \"%s\" is not found.\n", buf);
return;
}
/* Convert from perf-probe event to trace-kprobe event */
if (e_snprintf(buf, 128, "-:%s/%s", group, event) < 0)
die("Failed to copy event.");
write_trace_kprobe_event(fd, buf);
printf("Remove event: %s:%s\n", group, event);
}
void del_trace_kprobe_events(struct strlist *dellist)
{
int fd;
unsigned int i;
const char *group, *event;
char *p, *str;
struct str_node *ent;
struct strlist *namelist;
fd = open_kprobe_events(O_RDWR, O_APPEND);
/* Get current event names */
namelist = get_perf_event_names(fd, true);
for (i = 0; i < strlist__nr_entries(dellist); i++) {
ent = strlist__entry(dellist, i);
str = strdup(ent->s);
if (!str)
die("Failed to copy event.");
p = strchr(str, ':');
if (p) {
group = str;
*p = '\0';
event = p + 1;
} else {
group = PERFPROBE_GROUP;
event = str;
}
del_trace_kprobe_event(fd, group, event, namelist);
free(str);
}
strlist__delete(namelist);
close(fd);
}

1
tools/perf/util/probe-event.h
View file

@ -10,6 +10,7 @@ extern void parse_trace_kprobe_event(const char *str, char **group,
char **event, struct probe_point *pp);
extern int synthesize_trace_kprobe_event(struct probe_point *pp);
extern void add_trace_kprobe_events(struct probe_point *probes, int nr_probes);
extern void del_trace_kprobe_events(struct strlist *dellist);
extern void show_perf_probe_events(void);
/* Maximum index number of event-name postfix */