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authorMasami Hiramatsu <mhiramat@redhat.com>2010-03-16 18:06:05 -0400
committerIngo Molnar <mingo@elte.hu>2010-03-17 11:32:31 +0100
commitf4d7da499e4fc1fdff8f26fdeb1a058d475a7a6c (patch)
tree5ca14cb193ccc56c675a95ab8b97d6515575c83d /tools
parent016f262e4fb10c6ecff709317098912f94a21efa (diff)
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perf probe: Add --dry-run option
Add --dry-run option for debugging and testing. Signed-off-by: Masami Hiramatsu <mhiramat@redhat.com> Cc: systemtap <systemtap@sources.redhat.com> Cc: DLE <dle-develop@lists.sourceforge.net> 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> LKML-Reference: <20100316220605.32050.6571.stgit@localhost6.localdomain6> Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'tools')
-rw-r--r--tools/perf/Documentation/perf-probe.txt5
-rw-r--r--tools/perf/builtin-probe.c1
-rw-r--r--tools/perf/util/probe-event.c24
-rw-r--r--tools/perf/util/probe-event.h2
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);