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perf probe: Show accessible local variables

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Add -V (--vars) option for listing accessible local variables at given probe
point. This will help finding which local variables are available for event
arguments.

e.g.)
 # perf probe -V call_timer_fn:23
 Available variables at call_timer_fn:23
         @<run_timer_softirq+345>
                 function_type*  fn
                 int     preempt_count
                 long unsigned int       data
                 struct list_head        work_list
                 struct list_head*       head
                 struct timer_list*      timer
                 struct tvec_base*       base

Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
LKML-Reference: <20101021101323.3542.40282.stgit@ltc236.sdl.hitachi.co.jp>
Signed-off-by: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Masami Hiramatsu 2010-10-21 19:13:23 +09:00 • committed by Arnaldo Carvalho de Melo
parent 632941c4f8
commit cf6eb489e5
6 changed files with 480 additions and 105 deletions
Download patch file Download diff file Expand all files Collapse all files

72
tools/perf/util/probe-event.c
View file

@ -378,6 +378,72 @@ end:
return ret;
}
static int show_available_vars_at(int fd, struct perf_probe_event *pev,
int max_vls)
{
char *buf;
int ret, i;
struct str_node *node;
struct variable_list *vls = NULL, *vl;
buf = synthesize_perf_probe_point(&pev->point);
if (!buf)
return -EINVAL;
pr_debug("Searching variables at %s\n", buf);
ret = find_available_vars_at(fd, pev, &vls, max_vls);
if (ret > 0) {
/* Some variables were found */
fprintf(stdout, "Available variables at %s\n", buf);
for (i = 0; i < ret; i++) {
vl = &vls[i];
/*
* A probe point might be converted to
* several trace points.
*/
fprintf(stdout, "\t@<%s+%lu>\n", vl->point.symbol,
vl->point.offset);
free(vl->point.symbol);
if (vl->vars) {
strlist__for_each(node, vl->vars)
fprintf(stdout, "\t\t%s\n", node->s);
strlist__delete(vl->vars);
} else
fprintf(stdout, "(No variables)\n");
}
free(vls);
} else
pr_err("Failed to find variables at %s (%d)\n", buf, ret);
free(buf);
return ret;
}
/* Show available variables on given probe point */
int show_available_vars(struct perf_probe_event *pevs, int npevs,
int max_vls)
{
int i, fd, ret = 0;
ret = init_vmlinux();
if (ret < 0)
return ret;
fd = open_vmlinux();
if (fd < 0) {
pr_warning("Failed to open debuginfo file.\n");
return fd;
}
setup_pager();
for (i = 0; i < npevs && ret >= 0; i++)
ret = show_available_vars_at(fd, &pevs[i], max_vls);
close(fd);
return ret;
}
#else /* !DWARF_SUPPORT */
static int kprobe_convert_to_perf_probe(struct probe_trace_point *tp,
@ -409,6 +475,12 @@ int show_line_range(struct line_range *lr __unused)
return -ENOSYS;
}
int show_available_vars(struct perf_probe_event *pevs __unused,
int npevs __unused, int max_probe_points __unused)
{
pr_warning("Debuginfo-analysis is not supported.\n");
return -ENOSYS;
}
#endif
int parse_line_range_desc(const char *arg, struct line_range *lr)