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Subject[tip:perf/urgent] perf probe: Support --del option
Commit-ID:  fa28244d12337eebcc620b23852ec3cf29582ff9
Gitweb: http://git.kernel.org/tip/fa28244d12337eebcc620b23852ec3cf29582ff9
Author: Masami Hiramatsu <mhiramat@redhat.com>
AuthorDate: Tue, 8 Dec 2009 17:03:23 -0500
Committer: Ingo Molnar <mingo@elte.hu>
CommitDate: Wed, 9 Dec 2009 07:26:53 +0100

perf probe: Support --del option

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>
---
tools/perf/builtin-probe.c | 33 ++++++++++++++++++--
tools/perf/util/probe-event.c | 69 ++++++++++++++++++++++++++++++++++++++--
tools/perf/util/probe-event.h | 1 +
3 files changed, 96 insertions(+), 7 deletions(-)
diff --git a/tools/perf/builtin-probe.c b/tools/perf/builtin-probe.c
index 1c97e13..5a47c1e 100644
--- a/tools/perf/builtin-probe.c
+++ b/tools/perf/builtin-probe.c
@@ -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");
diff --git a/tools/perf/util/probe-event.c b/tools/perf/util/probe-event.c
index 31beedc..9480d99 100644
--- a/tools/perf/util/probe-event.c
+++ b/tools/perf/util/probe-event.c
@@ -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);
+}
+
diff --git a/tools/perf/util/probe-event.h b/tools/perf/util/probe-event.h
index 0c6fe56..f752159 100644
--- a/tools/perf/util/probe-event.h
+++ b/tools/perf/util/probe-event.h
@@ -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 */

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