perf tools: Complete support for dynamic strings
Complete support for __str_loc type strings of ftrace events
which have dynamic offsets values set for each of them inside
their sammples.
Before:
geany-5759 [000] 0.000000: lock_release: name
geany-5759 [000] 0.000000: lock_release: name
geany-5759 [000] 0.000000: lock_release: name
kondemand/0-362 [000] 0.000000: lock_release: name
pdflush-421 [000] 0.000000: lock_release: name
After:
geany-5759 [000] 0.000000: lock_release: &u->lock
geany-5759 [000] 0.000000: lock_release: key
geany-5759 [000] 0.000000: lock_release: &group->notification_mutex
kondemand/0-362 [000] 0.000000: lock_release: &rq->lock
pdflush-421 [000] 0.000000: lock_release: &rq->lock
Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Steven Rostedt <rostedt@goodmis.org>
LKML-Reference: <1251693921-6579-4-git-send-email-fweisbec@gmail.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Steven Rostedt <rostedt@goodmis.org>
diff --git a/tools/perf/util/trace-event-parse.c b/tools/perf/util/trace-event-parse.c
index 96c5e97..665dac2 100644
--- a/tools/perf/util/trace-event-parse.c
+++ b/tools/perf/util/trace-event-parse.c
@@ -1548,6 +1548,7 @@
arg->type = PRINT_STRING;
arg->string.string = token;
+ arg->string.offset = -1;
if (read_expected(EVENT_DELIM, (char *)")") < 0)
return EVENT_ERROR;
@@ -2031,9 +2032,20 @@
case PRINT_TYPE:
break;
- case PRINT_STRING:
- printf("%s", arg->string.string);
+ case PRINT_STRING: {
+ int str_offset;
+
+ if (arg->string.offset == -1) {
+ struct format_field *f;
+
+ f = find_any_field(event, arg->string.string);
+ arg->string.offset = f->offset;
+ }
+ str_offset = *(int *)(data + arg->string.offset);
+ str_offset &= 0xffff;
+ printf("%s", ((char *)data) + str_offset);
break;
+ }
case PRINT_OP:
/*
* The only op for string should be ? :