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Subject[PATCH -tip 07/10] perf probe: Add --dry-run option
Date
Add --dry-run option for debugging and testing.

Signed-off-by: Masami Hiramatsu <mhiramat@redhat.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
---
tools/perf/Documentation/perf-probe.txt | 5 +++++
tools/perf/builtin-probe.c | 1 +
tools/perf/util/probe-event.c | 24 ++++++++++++++++--------
tools/perf/util/probe-event.h | 2 ++
4 files changed, 24 insertions(+), 8 deletions(-)
diff --git a/tools/perf/Documentation/perf-probe.txt b/tools/perf/Documentation/perf-probe.txt
index 34202b1..0f944b3 100644
--- a/tools/perf/Documentation/perf-probe.txt
+++ b/tools/perf/Documentation/perf-probe.txt
@@ -57,6 +57,11 @@ OPTIONS
--force::
Forcibly add events with existing name.

+-n::
+--dry-run::
+ Dry run. With this option, --add and --del doesn't execute actual
+ adding and removal operations.
+
PROBE SYNTAX
------------
Probe points are defined by following syntax.
diff --git a/tools/perf/builtin-probe.c b/tools/perf/builtin-probe.c
index f577e14..a1a2891 100644
--- a/tools/perf/builtin-probe.c
+++ b/tools/perf/builtin-probe.c
@@ -175,6 +175,7 @@ static const struct option options[] = {
"FUNC[:RLN[+NUM|:RLN2]]|SRC:ALN[+NUM|:ALN2]",
"Show source code lines.", opt_show_lines),
#endif
+ OPT__DRY_RUN(&probe_event_dry_run),
OPT_END()
};

diff --git a/tools/perf/util/probe-event.c b/tools/perf/util/probe-event.c
index 1e60a65..ac41578 100644
--- a/tools/perf/util/probe-event.c
+++ b/tools/perf/util/probe-event.c
@@ -49,6 +49,8 @@
#define MAX_PROBE_ARGS 128
#define PERFPROBE_GROUP "probe"

+bool probe_event_dry_run; /* Dry run flag */
+
#define semantic_error(msg ...) die("Semantic error :" msg)

/* If there is no space to write, returns -E2BIG. */
@@ -430,7 +432,7 @@ error:
return ret;
}

-static int open_kprobe_events(int flags, int mode)
+static int open_kprobe_events(bool readwrite)
{
char buf[PATH_MAX];
int ret;
@@ -439,7 +441,11 @@ static int open_kprobe_events(int flags, int mode)
if (ret < 0)
die("Failed to make kprobe_events path.");

- ret = open(buf, flags, mode);
+ if (readwrite && !probe_event_dry_run)
+ ret = open(buf, O_RDWR, O_APPEND);
+ else
+ ret = open(buf, O_RDONLY, 0);
+
if (ret < 0) {
if (errno == ENOENT)
die("kprobe_events file does not exist -"
@@ -535,7 +541,7 @@ void show_perf_probe_events(void)
setup_pager();
memset(&pp, 0, sizeof(pp));

- fd = open_kprobe_events(O_RDONLY, 0);
+ fd = open_kprobe_events(false);
rawlist = get_trace_kprobe_event_rawlist(fd);
close(fd);

@@ -585,9 +591,11 @@ 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 write event: %s", strerror(errno));
+ if (!probe_event_dry_run) {
+ ret = write(fd, buf, strlen(buf));
+ if (ret <= 0)
+ die("Failed to write event: %s", strerror(errno));
+ }
}

static void get_new_event_name(char *buf, size_t len, const char *base,
@@ -630,7 +638,7 @@ static void __add_trace_kprobe_events(struct probe_point *probes,
struct strlist *namelist;
bool allow_suffix;

- fd = open_kprobe_events(O_RDWR, O_APPEND);
+ fd = open_kprobe_events(true);
/* Get current event names */
namelist = get_perf_event_names(fd, false);

@@ -814,7 +822,7 @@ void del_trace_kprobe_events(struct strlist *dellist)
struct str_node *ent;
struct strlist *namelist;

- fd = open_kprobe_events(O_RDWR, O_APPEND);
+ fd = open_kprobe_events(true);
/* Get current event names */
namelist = get_perf_event_names(fd, true);

diff --git a/tools/perf/util/probe-event.h b/tools/perf/util/probe-event.h
index 3865e16..703b887 100644
--- a/tools/perf/util/probe-event.h
+++ b/tools/perf/util/probe-event.h
@@ -5,6 +5,8 @@
#include "probe-finder.h"
#include "strlist.h"

+extern bool probe_event_dry_run;
+
extern void parse_line_range_desc(const char *arg, struct line_range *lr);
extern void parse_perf_probe_event(const char *str, struct probe_point *pp,
bool *need_dwarf);

--
Masami Hiramatsu
e-mail: mhiramat@redhat.com


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