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Subject[PATCH 2/3] perf probe: Make --source avaiable when probe with lazy_line
Date
Use get_real_path() to enable --source option when probe with lazy_line
pattern.

Before this patch:

$ perf probe -s ./kernel_src/ -k ./vmlinux --add='fs/super.c;s->s_count=1;'
Failed to open fs/super.c: No such file or directory
Error: Failed to add events.

After this patch:

$ perf probe -s ./kernel_src/ -k ./vmlinux --add='fs/super.c;s->s_count=1;'
Added new events:
probe:_stext (on @fs/super.c)
probe:_stext_1 (on @fs/super.c)
...

Signed-off-by: He Kuang <hekuang@huawei.com>
---
tools/perf/util/probe-event.c | 2 +-
tools/perf/util/probe-event.h | 2 ++
tools/perf/util/probe-finder.c | 18 +++++++++++++++---
3 files changed, 18 insertions(+), 4 deletions(-)

diff --git a/tools/perf/util/probe-event.c b/tools/perf/util/probe-event.c
index 5483d98..35ee51a 100644
--- a/tools/perf/util/probe-event.c
+++ b/tools/perf/util/probe-event.c
@@ -661,7 +661,7 @@ static int try_to_find_probe_trace_events(struct perf_probe_event *pev,
* a newly allocated path on success.
* Return 0 if file was found and readable, -errno otherwise.
*/
-static int get_real_path(const char *raw_path, const char *comp_dir,
+int get_real_path(const char *raw_path, const char *comp_dir,
char **new_path)
{
const char *prefix = symbol_conf.source_prefix;
diff --git a/tools/perf/util/probe-event.h b/tools/perf/util/probe-event.h
index d6b7834..21809ea 100644
--- a/tools/perf/util/probe-event.h
+++ b/tools/perf/util/probe-event.h
@@ -135,6 +135,8 @@ extern int show_available_vars(struct perf_probe_event *pevs, int npevs,
struct strfilter *filter, bool externs);
extern int show_available_funcs(const char *module, struct strfilter *filter,
bool user);
+extern int get_real_path(const char *raw_path, const char *comp_dir,
+ char **new_path);

/* Maximum index number of event-name postfix */
#define MAX_EVENT_INDEX 1024
diff --git a/tools/perf/util/probe-finder.c b/tools/perf/util/probe-finder.c
index 7831e2d..431c12d 100644
--- a/tools/perf/util/probe-finder.c
+++ b/tools/perf/util/probe-finder.c
@@ -791,11 +791,20 @@ static int find_lazy_match_lines(struct intlist *list,
ssize_t len;
int count = 0, linenum = 1;
char sbuf[STRERR_BUFSIZE];
+ char *realname = NULL;
+ int ret;

- fp = fopen(fname, "r");
+ ret = get_real_path(fname, NULL, &realname);
+ if (ret < 0) {
+ pr_warning("Failed to find source file %s.\n", fname);
+ return ret;
+ }
+
+ fp = fopen(realname, "r");
if (!fp) {
- pr_warning("Failed to open %s: %s\n", fname,
+ pr_warning("Failed to open %s: %s\n", realname,
strerror_r(errno, sbuf, sizeof(sbuf)));
+ free(realname);
return -errno;
}

@@ -817,7 +826,10 @@ static int find_lazy_match_lines(struct intlist *list,
fclose(fp);

if (count == 0)
- pr_debug("No matched lines found in %s.\n", fname);
+ pr_debug("No matched lines found in %s.\n", realname);
+
+ free(realname);
+
return count;
}

--
2.3.3.220.g9ab698f


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