From 428aff82e92a29da0e4276623180f9a98f2d5b16 Mon Sep 17 00:00:00 2001 From: Masami Hiramatsu Date: Fri, 26 Aug 2016 01:24:42 +0900 Subject: 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 Cc: Jiri Olsa Cc: Peter Zijlstra Link: http://lkml.kernel.org/r/147214228193.23638.12581984840822162131.stgit@devbox Signed-off-by: Arnaldo Carvalho de Melo --- tools/perf/Documentation/perf-probe.txt | 2 ++ 1 file changed, 2 insertions(+) (limited to 'tools/perf/Documentation') diff --git a/tools/perf/Documentation/perf-probe.txt b/tools/perf/Documentation/perf-probe.txt index 56db4d40d27e..e6c9902c6d82 100644 --- a/tools/perf/Documentation/perf-probe.txt +++ b/tools/perf/Documentation/perf-probe.txt @@ -36,6 +36,8 @@ OPTIONS -k:: --vmlinux=PATH:: Specify vmlinux path which has debuginfo (Dwarf binary). + Only when using this with --definition, you can give an offline + vmlinux file. -m:: --module=MODNAME|PATH:: -- cgit v1.2.3