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perf probe: Enable to put probe inline function call site 

Enable to put probe inline function call site. This will increase line-based
probe-ability.

<Without this patch>
$ ./perf probe -L schedule:48
<schedule:48>
                pre_schedule(rq, prev);

     50         if (unlikely(!rq->nr_running))
                        idle_balance(cpu, rq);

                put_prev_task(rq, prev);
                next = pick_next_task(rq);

     56         if (likely(prev != next)) {
                        sched_info_switch(prev, next);
                        trace_sched_switch_out(prev, next);
                        perf_event_task_sched_out(prev, next);

<With this patch>
$ ./perf probe -L schedule:48
<schedule:48>
     48         pre_schedule(rq, prev);

     50         if (unlikely(!rq->nr_running))
     51                 idle_balance(cpu, rq);

     53         put_prev_task(rq, prev);
     54         next = pick_next_task(rq);

     56         if (likely(prev != next)) {
     57                 sched_info_switch(prev, next);
     58                 trace_sched_switch_out(prev, next);
     59                 perf_event_task_sched_out(prev, next);

Cc: 2nddept-manager@sdl.hitachi.co.jp
Cc: Franck Bui-Huu <fbuihuu@gmail.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Srikar Dronamraju <srikar@linux.vnet.ibm.com>
Cc: Steven Rostedt <rostedt@goodmis.org>
LKML-Reference: <20110113124604.22426.48873.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 2011-01-13 21:46:05 +09:00 committed by Arnaldo Carvalho de Melo
parent 4cc9cec636
commit 5069ed86be
1 changed files with 48 additions and 8 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

56
tools/perf/util/probe-finder.c
View File

@ -280,6 +280,19 @@ static bool die_compare_name(Dwarf_Die *dw_die, const char *tname)
return name ? (strcmp(tname, name) == 0) : false;
}
/* Get callsite line number of inline-function instance */
static int die_get_call_lineno(Dwarf_Die *in_die)
{
Dwarf_Attribute attr;
Dwarf_Word ret;
if (!dwarf_attr(in_die, DW_AT_call_line, &attr))
return -ENOENT;
dwarf_formudata(&attr, &ret);
return (int)ret;
}
/* Get type die */
static Dwarf_Die *die_get_type(Dwarf_Die *vr_die, Dwarf_Die *die_mem)
{
@ -463,27 +476,54 @@ typedef int (* line_walk_handler_t) (const char *fname, int lineno,
Dwarf_Addr addr, void *data);
struct __line_walk_param {
const char *fname;
line_walk_handler_t handler;
void *data;
int retval;
};
/* Walk on decl lines in given DIE */
static int __die_walk_funclines_cb(Dwarf_Die *in_die, void *data)
{
struct __line_walk_param *lw = data;
Dwarf_Addr addr;
int lineno;
if (dwarf_tag(in_die) == DW_TAG_inlined_subroutine) {
lineno = die_get_call_lineno(in_die);
if (lineno > 0 && dwarf_entrypc(in_die, &addr) == 0) {
lw->retval = lw->handler(lw->fname, lineno, addr,
lw->data);
if (lw->retval != 0)
return DIE_FIND_CB_FOUND;
}
}
return DIE_FIND_CB_SIBLING;
}
/* Walk on lines of blocks included in given DIE */
static int __die_walk_funclines(Dwarf_Die *sp_die,
line_walk_handler_t handler, void *data)
{
const char *fname;
struct __line_walk_param lw = {
.handler = handler,
.data = data,
.retval = 0,
};
Dwarf_Die die_mem;
Dwarf_Addr addr;
int lineno, ret = 0;
int lineno;
/* Handle function declaration line */
fname = dwarf_decl_file(sp_die);
if (fname && dwarf_decl_line(sp_die, &lineno) == 0 &&
lw.fname = dwarf_decl_file(sp_die);
if (lw.fname && dwarf_decl_line(sp_die, &lineno) == 0 &&
dwarf_entrypc(sp_die, &addr) == 0) {
ret = handler(fname, lineno, addr, data);
lw.retval = handler(lw.fname, lineno, addr, data);
if (lw.retval != 0)
goto done;
}
return ret;
die_find_child(sp_die, __die_walk_funclines_cb, &lw, &die_mem);
done:
return lw.retval;
}
static int __die_walk_culines_cb(Dwarf_Die *sp_die, void *data)