[RFC PATCH 7/8] perf probe powerpc: Use DWARF info only if necessary
From: Naveen N. Rao <hidden>
Date: 2014-12-09 17:35:51
Also in:
lkml
Subsystem:
performance events subsystem, the rest · Maintainers:
Peter Zijlstra, Ingo Molnar, Arnaldo Carvalho de Melo, Namhyung Kim, Linus Torvalds
Use symbol table lookups by default if DWARF is not necessary, since powerpc ABIv2 encodes local entry points in the symbol table and the function entry address in DWARF may not be appropriate for kprobes, as described here: https://sourceware.org/bugzilla/show_bug.cgi?id=17638 Signed-off-by: Naveen N. Rao <redacted> --- tools/perf/util/probe-event.c | 8 ++++++++ 1 file changed, 8 insertions(+)
diff --git a/tools/perf/util/probe-event.c b/tools/perf/util/probe-event.c
index 174c22e..adcdbd2 100644
--- a/tools/perf/util/probe-event.c
+++ b/tools/perf/util/probe-event.c@@ -2382,6 +2382,14 @@ static int convert_to_probe_trace_events(struct perf_probe_event *pev, } } +#if defined(__powerpc64__) && defined(_CALL_ELF) && _CALL_ELF == 2 + if (!perf_probe_event_need_dwarf(pev)) { + ret = find_probe_trace_events_from_map(pev, tevs, max_tevs, target); + if (ret > 0) + return ret; /* Found in symbol table */ + } +#endif + /* Convert perf_probe_event with debuginfo */ ret = try_to_find_probe_trace_events(pev, tevs, max_tevs, target); if (ret != 0)
--
2.1.3