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authorMasami Hiramatsu <mhiramat@kernel.org>2016-08-25 18:24:42 +0200
committerArnaldo Carvalho de Melo <acme@redhat.com>2016-09-01 14:44:14 +0200
commit428aff82e92a29da0e4276623180f9a98f2d5b16 (patch)
tree90b34a229cdba27e44389408b75d4b33ae9fd2ea /tools/perf/builtin-probe.c
parentperf probe: Show trace event definition (diff)
downloadlinux-428aff82e92a29da0e4276623180f9a98f2d5b16.tar.xz
linux-428aff82e92a29da0e4276623180f9a98f2d5b16.zip
perf probe: Ignore vmlinux buildid if offline kernel is given
Ignore the buildid of running kernel when both of --definition and --vmlinux is given because that kernel should be off-line. This also skips post-processing of kprobe event for relocating symbol and checking blacklist, because it can not be done on off-line kernel. E.g. without this fix perf shows an error as below ---- $ perf probe --vmlinux=./vmlinux-arm --definition do_sys_open ./vmlinux-arm with build id 7a1f76dd56e9c4da707cd3d6333f50748141434b not found, continuing without symbols Failed to find symbol do_sys_open in kernel Error: Failed to add events. ---- with this fix, we can get the definition ---- $ perf probe --vmlinux=./vmlinux-arm --definition do_sys_open p:probe/do_sys_open do_sys_open+0 ---- Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org> Cc: Jiri Olsa <jolsa@redhat.com> Cc: Peter Zijlstra <peterz@infradead.org> Link: http://lkml.kernel.org/r/147214228193.23638.12581984840822162131.stgit@devbox Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Diffstat (limited to 'tools/perf/builtin-probe.c')
-rw-r--r--tools/perf/builtin-probe.c10
1 files changed, 9 insertions, 1 deletions
diff --git a/tools/perf/builtin-probe.c b/tools/perf/builtin-probe.c
index 7a3d8c47ed29..b4220cd4acd8 100644
--- a/tools/perf/builtin-probe.c
+++ b/tools/perf/builtin-probe.c
@@ -654,8 +654,16 @@ __cmd_probe(int argc, const char **argv, const char *prefix __maybe_unused)
return ret;
}
break;
- case 'a':
case 'D':
+ /*
+ * If user gives offline vmlinux, ignore buildid, since
+ * --definition doesn't change running kernel.
+ */
+ if (symbol_conf.vmlinux_name)
+ symbol_conf.ignore_vmlinux_buildid = true;
+ /* fall through */
+ case 'a':
+
/* Ensure the last given target is used */
if (params.target && !params.target_used) {
pr_err(" Error: -x/-m must follow the probe definitions.\n");