Em Sat, Aug 29, 2015 at 04:22:01AM +0000, Wang Nan escreveu: > From: He Kuang <[email protected]> > > Make perf-record command support --vmlinux option if BPF_PROLOGUE is on.
Ok, this should be supported, i.e. letting the user specify a vmlinux path to use. But it shouldn't be _required_, i.e. we have things like vmlinux_path to try to find it in well known places. Right now it will search for it in the process of trying to load its symtab, but I think we should have a function that tries to find a vmlinux that matches the build-id of the running kernel, for things that want to have access directly to the ELF file with debuginfo without having to load the symtab in a struct dso, etc. I'll look at the next patches to check how you make use of this info... - Arnaldo > 'perf record' needs vmlinux as the source of DWARF info to generate > prologue for BPF programs, so path of vmlinux should be specified. > > Short name 'k' has been taken by 'clockid'. This patch skips the short > option name and use '--vmlinux' for vmlinux path. > > Signed-off-by: He Kuang <[email protected]> > Signed-off-by: Wang Nan <[email protected]> > Cc: Alexei Starovoitov <[email protected]> > Cc: Brendan Gregg <[email protected]> > Cc: Daniel Borkmann <[email protected]> > Cc: David Ahern <[email protected]> > Cc: He Kuang <[email protected]> > Cc: Jiri Olsa <[email protected]> > Cc: Kaixu Xia <[email protected]> > Cc: Masami Hiramatsu <[email protected]> > Cc: Namhyung Kim <[email protected]> > Cc: Paul Mackerras <[email protected]> > Cc: Peter Zijlstra <[email protected]> > Cc: Zefan Li <[email protected]> > Cc: [email protected] > Cc: Arnaldo Carvalho de Melo <[email protected]> > Link: > http://lkml.kernel.org/n/[email protected] > --- > tools/perf/builtin-record.c | 4 ++++ > 1 file changed, 4 insertions(+) > > diff --git a/tools/perf/builtin-record.c b/tools/perf/builtin-record.c > index 212718c..8eb39d5 100644 > --- a/tools/perf/builtin-record.c > +++ b/tools/perf/builtin-record.c > @@ -1100,6 +1100,10 @@ struct option __record_options[] = { > "clang binary to use for compiling BPF scriptlets"), > OPT_STRING(0, "clang-opt", &llvm_param.clang_opt, "clang options", > "options passed to clang when compiling BPF scriptlets"), > +#ifdef HAVE_BPF_PROLOGUE > + OPT_STRING(0, "vmlinux", &symbol_conf.vmlinux_name, > + "file", "vmlinux pathname"), > +#endif > #endif > OPT_END() > }; > -- > 2.1.0 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
