linux-kernel - [RFC PATCH 3/4] perf-probe: Ignore vmlinux buildid if offline kernel is given

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Message-Id: <147201830716.5713.4198150817987792737.stgit@devbox>
Date:   Wed, 24 Aug 2016 14:58:27 +0900
From:   Masami Hiramatsu <mhiramat@...nel.org>
To:     Arnaldo Carvalho de Melo <acme@...nel.org>
Cc:     Masami Hiramatsu <mhiramat@...nel.org>,
        linux-kernel@...r.kernel.org,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>, Jiri Olsa <jolsa@...hat.com>
Subject: [RFC PATCH 3/4] perf-probe: Ignore vmlinux buildid if offline kernel is given

Ignore the buildid of running kernel when both --outdir and
--vmlinux is given and --outdir is not tracing_path,
because that kernel should be off-line.

Signed-off-by: Masami Hiramatsu <mhiramat@...nel.org>
---
 tools/perf/builtin-probe.c   |    6 ++++++
 tools/perf/util/symbol-elf.c |    2 +-
 2 files changed, 7 insertions(+), 1 deletion(-)

diff --git a/tools/perf/builtin-probe.c b/tools/perf/builtin-probe.c
index 5b45ec8..773cea0 100644
--- a/tools/perf/builtin-probe.c
+++ b/tools/perf/builtin-probe.c
@@ -602,6 +602,12 @@ __cmd_probe(int argc, const char **argv, const char *prefix __maybe_unused)
 	 */
 	symbol_conf.try_vmlinux_path = (symbol_conf.vmlinux_name == NULL);
 
+	/* If user gives output directory and offline vmlinux, ignore buildid */
+	if (probe_conf.output_dir && symbol_conf.vmlinux_name &&
+	    strcmp(probe_conf.output_dir, tracing_path) != 0) {
+		symbol_conf.ignore_vmlinux_buildid = true;
+	}
+
 	switch (params.command) {
 	case 'l':
 		if (params.uprobes) {
diff --git a/tools/perf/util/symbol-elf.c b/tools/perf/util/symbol-elf.c
index a811c13..013cebf 100644
--- a/tools/perf/util/symbol-elf.c
+++ b/tools/perf/util/symbol-elf.c
@@ -685,7 +685,7 @@ int symsrc__init(struct symsrc *ss, struct dso *dso, const char *name,
 	}
 
 	/* Always reject images with a mismatched build-id: */
-	if (dso->has_build_id) {
+	if (dso->has_build_id && !symbol_conf.ignore_vmlinux_buildid) {
 		u8 build_id[BUILD_ID_SIZE];
 
 		if (elf_read_build_id(elf, build_id, BUILD_ID_SIZE) < 0) {