perf tools: Preserving event modifiers

[Arnaldo Carvalho de Melo <acme@ghostprotocols.net>]

Hi Jiri,

We need to preserve the original event name so that we can show it on the TUI,
for instance. Humm, when rebuilding it from perf.data we'll need to look at
perf_event_attr.precise bits too...

(gdb) run top -e cycles:p
Starting program: /root/bin/perf top -e cycles:p
[Thread debugging using libthread_db enabled]

Breakpoint 1, perf_evsel__init (evsel=0x909c50, attr=0x7fffffffad30, idx=0) at util/evsel.c:50
50	{
(gdb) n
51		evsel->idx	   = idx;
(gdb) n
52		evsel->attr	   = *attr;
(gdb) 
53		INIT_LIST_HEAD(&evsel->node);
(gdb) 
54		hists__init(&evsel->hists);
(gdb) 
55	}
(gdb) 
perf_evsel__new (attr=0x7fffffffad30, idx=0) at util/evsel.c:64
64		return evsel;
(gdb) 
65	}
(gdb) 
add_event (_list=0x7fffffffadc0, idx=0x7fffffffb6c0, attr=0x7fffffffad30, name=0x54598b "cycles") at util/parse-events.c:376
376		if (!evsel) {
(gdb) 
381		evsel->name = strdup(name);
(gdb) p name
$5 = 0x54598b "cycles"
(gdb) p name
$6 = 0x54598b "cycles"
(gdb) bt
#0  add_event (_list=0x7fffffffadc0, idx=0x7fffffffb6c0, attr=0x7fffffffad30, name=0x54598b "cycles") at util/parse-events.c:381
#1  0x000000000044e483 in parse_events_add_numeric (list=0x7fffffffadc0, idx=0x7fffffffb6c0, type=0, config=0, head_config=0x0) at util/parse-events.c:674
#2  0x000000000047667d in parse_events_parse (list_all=0x7fffffffb6a0, idx=0x7fffffffb6c0) at util/parse-events.y:117
#3  0x000000000044e9fd in parse_events (evlist=0x9083c0, str=0x7fffffffe899 "cycles:p", unset=0) at util/parse-events.c:807
#4  0x000000000044eaf1 in parse_events_option (opt=0x7fffffffba10, str=0x7fffffffe899 "cycles:p", unset=0) at util/parse-events.c:833
#5  0x000000000044b68f in get_value (p=0x7fffffffb840, opt=0x7fffffffba10, flags=1) at util/parse-options.c:112
#6  0x000000000044ba8b in parse_short_opt (p=0x7fffffffb840, options=0x7fffffffba10) at util/parse-options.c:191
#7  0x000000000044c0bd in parse_options_step (ctx=0x7fffffffb840, options=0x7fffffffba10, usagestr=0x53f9f0) at util/parse-options.c:342
#8  0x000000000044c46e in parse_options (argc=3, argv=0x7fffffffe640, options=0x7fffffffba10, usagestr=0x53f9f0, flags=0) at util/parse-options.c:417
#9  0x000000000042eead in cmd_top (argc=3, argv=0x7fffffffe640, prefix=0x0) at builtin-top.c:1250
#10 0x0000000000415359 in run_builtin (p=0x79b8a8, argc=3, argv=0x7fffffffe640) at perf.c:273
#11 0x000000000041555c in handle_internal_command (argc=3, argv=0x7fffffffe640) at perf.c:345
#12 0x00000000004156a8 in run_argv (argcp=0x7fffffffe52c, argv=0x7fffffffe520) at perf.c:389
#13 0x000000000041592e in main (argc=3, argv=0x7fffffffe640) at perf.c:487
(gdb)