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