perf symbols: Add new option --ignore-vmlinux for perf top

Running "perf top" on a machine with possibly invalid or non-matching
vmlinux at the various places results in no symbol resolving despite
/proc/kallsyms being present and valid.

Add a new option --ignore-vmlinux to explicitly indicate that we do not
want to use these kernels and just use what we have (kallsyms).

Signed-off-by: Willy Tarreau <w@1wt.eu>
Cc: Ingo Molnar <mingo@redhat.com>
Link: http://lkml.kernel.org/r/20130914083259.GA3418@1wt.eu
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

diff --git a/tools/perf/builtin-top.c b/tools/perf/builtin-top.c
index e846695..65c49b2 100644 (file)
--- a/tools/perf/builtin-top.c
+++ b/tools/perf/builtin-top.c
@@ -1073,6 +1073,8 @@ int cmd_top(int argc, const char **argv, const char *prefix __maybe_unused)
                    "list of cpus to monitor"),
        OPT_STRING('k', "vmlinux", &symbol_conf.vmlinux_name,
                   "file", "vmlinux pathname"),
+       OPT_BOOLEAN(0, "ignore-vmlinux", &symbol_conf.ignore_vmlinux,
+                   "don't load vmlinux even if found"),
        OPT_BOOLEAN('K', "hide_kernel_symbols", &top.hide_kernel_symbols,
                    "hide kernel symbols"),
        OPT_CALLBACK('m', "mmap-pages", &opts->mmap_pages, "pages",

diff --git a/tools/perf/util/symbol.c b/tools/perf/util/symbol.c
index cd1dcc4..48c3879 100644 (file)
--- a/tools/perf/util/symbol.c
+++ b/tools/perf/util/symbol.c
@@ -1215,7 +1215,7 @@ static int dso__load_kernel_sym(struct dso *dso, struct map *map,
                goto do_kallsyms;
        }
 
-       if (symbol_conf.vmlinux_name != NULL) {
+       if (!symbol_conf.ignore_vmlinux && symbol_conf.vmlinux_name != NULL) {
                err = dso__load_vmlinux(dso, map,
                                        symbol_conf.vmlinux_name, filter);
                if (err > 0) {
@@ -1227,7 +1227,7 @@ static int dso__load_kernel_sym(struct dso *dso, struct map *map,
                return err;
        }
 
-       if (vmlinux_path != NULL) {
+       if (!symbol_conf.ignore_vmlinux && vmlinux_path != NULL) {
                err = dso__load_vmlinux_path(dso, map, filter);
                if (err > 0)
                        return err;

diff --git a/tools/perf/util/symbol.h b/tools/perf/util/symbol.h
index 2a97bb1..9b8b213 100644 (file)
--- a/tools/perf/util/symbol.h
+++ b/tools/perf/util/symbol.h
@@ -85,6 +85,7 @@ struct symbol_conf {
        unsigned short  priv_size;
        unsigned short  nr_events;
        bool            try_vmlinux_path,
+                       ignore_vmlinux,
                        show_kernel_path,
                        use_modules,
                        sort_by_name,