diff options
| author | Masami Hiramatsu <mhiramat@kernel.org> | 2016-08-25 18:24:42 +0200 |
|---|---|---|
| committer | Arnaldo Carvalho de Melo <acme@redhat.com> | 2016-09-01 14:44:14 +0200 |
| commit | 428aff82e92a29da0e4276623180f9a98f2d5b16 (patch) | |
| tree | 90b34a229cdba27e44389408b75d4b33ae9fd2ea /tools/perf/Documentation | |
| parent | perf probe: Show trace event definition (diff) | |
| download | linux-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/Documentation')
| -rw-r--r-- | tools/perf/Documentation/perf-probe.txt | 2 |
1 files changed, 2 insertions, 0 deletions
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:: |