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perf probe: Add --dry-run option

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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>
This commit is contained in:
Masami Hiramatsu 2010-03-16 18:06:05 -04:00 committed by Ingo Molnar
parent 016f262e4f
commit f4d7da499e
4 changed files with 24 additions and 8 deletions
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5
tools/perf/Documentation/perf-probe.txt
View File

@ -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.

1
tools/perf/builtin-probe.c
View File

@ -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()
};

24
tools/perf/util/probe-event.c
View File

@ -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);

2
tools/perf/util/probe-event.h
View File

@ -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);