perf symbols: Check compatible symtab type before loading dso

When loading a dso it'll look for symbol tables of all possible types.
However it's just wasted of time to check incompatible types - like
trying kernel module when loading user library.

Signed-off-by: Namhyung Kim <namhyung@kernel.org>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Cody P Schafer <cody@linux.vnet.ibm.com>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Namhyung Kim <namhyung.kim@lge.com>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Stephane Eranian <eranian@google.com>
Link: http://lkml.kernel.org/r/1392859976-32760-4-git-send-email-namhyung@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

1 files changed, 52 insertions, 9 deletions

diff --git a/tools/perf/util/symbol.c b/tools/perf/util/symbol.c
index 46e2ede12c51..0ada68b3b096 100644
--- a/tools/perf/util/symbol.c
+++ b/tools/perf/util/symbol.c
@@ -1251,6 +1251,46 @@ out_failure:
         return -1;
 }
 
+static bool dso__is_compatible_symtab_type(struct dso *dso, bool kmod,
+                                           enum dso_binary_type type)
+{
+        switch (type) {
+        case DSO_BINARY_TYPE__JAVA_JIT:
+        case DSO_BINARY_TYPE__DEBUGLINK:
+        case DSO_BINARY_TYPE__SYSTEM_PATH_DSO:
+        case DSO_BINARY_TYPE__FEDORA_DEBUGINFO:
+        case DSO_BINARY_TYPE__UBUNTU_DEBUGINFO:
+        case DSO_BINARY_TYPE__BUILDID_DEBUGINFO:
+        case DSO_BINARY_TYPE__OPENEMBEDDED_DEBUGINFO:
+                return !kmod && dso->kernel == DSO_TYPE_USER;
+
+        case DSO_BINARY_TYPE__KALLSYMS:
+        case DSO_BINARY_TYPE__VMLINUX:
+        case DSO_BINARY_TYPE__KCORE:
+                return dso->kernel == DSO_TYPE_KERNEL;
+
+        case DSO_BINARY_TYPE__GUEST_KALLSYMS:
+        case DSO_BINARY_TYPE__GUEST_VMLINUX:
+        case DSO_BINARY_TYPE__GUEST_KCORE:
+                return dso->kernel == DSO_TYPE_GUEST_KERNEL;
+
+        case DSO_BINARY_TYPE__GUEST_KMODULE:
+        case DSO_BINARY_TYPE__SYSTEM_PATH_KMODULE:
+                /*
+                 * kernel modules know their symtab type - it's set when
+                 * creating a module dso in machine__new_module().
+                 */
+                return kmod && dso->symtab_type == type;
+
+        case DSO_BINARY_TYPE__BUILD_ID_CACHE:
+                return true;
+
+        case DSO_BINARY_TYPE__NOT_FOUND:
+        default:
+                return false;
+        }
+}
+
 int dso__load(struct dso *dso, struct map *map, symbol_filter_t filter)
 {
         char *name;
@@ -1261,6 +1301,7 @@ int dso__load(struct dso *dso, struct map *map, symbol_filter_t filter)
         int ss_pos = 0;
         struct symsrc ss_[2];
         struct symsrc *syms_ss = NULL, *runtime_ss = NULL;
+        bool kmod;
 
         dso__set_loaded(dso, map->type);
 
@@ -1301,7 +1342,11 @@ int dso__load(struct dso *dso, struct map *map, symbol_filter_t filter)
         if (!name)
                 return -1;
 
-        /* Iterate over candidate debug images.
+        kmod = dso->symtab_type == DSO_BINARY_TYPE__SYSTEM_PATH_KMODULE ||
+                dso->symtab_type == DSO_BINARY_TYPE__GUEST_KMODULE;
+
+        /*
+         * Iterate over candidate debug images.
          * Keep track of "interesting" ones (those which have a symtab, dynsym,
          * and/or opd section) for processing.
          */
@@ -1311,6 +1356,9 @@ int dso__load(struct dso *dso, struct map *map, symbol_filter_t filter)
 
                 enum dso_binary_type symtab_type = binary_type_symtab[i];
 
+                if (!dso__is_compatible_symtab_type(dso, kmod, symtab_type))
+                        continue;
+
                 if (dso__read_binary_type_filename(dso, symtab_type,
                                                    root_dir, name, PATH_MAX))
                         continue;
@@ -1351,15 +1399,10 @@ int dso__load(struct dso *dso, struct map *map, symbol_filter_t filter)
         if (!runtime_ss && syms_ss)
                 runtime_ss = syms_ss;
 
-        if (syms_ss) {
-                int km;
-
-                km = dso->symtab_type == DSO_BINARY_TYPE__SYSTEM_PATH_KMODULE ||
-                     dso->symtab_type == DSO_BINARY_TYPE__GUEST_KMODULE;
-                ret = dso__load_sym(dso, map, syms_ss, runtime_ss, filter, km);
-        } else {
+        if (syms_ss)
+                ret = dso__load_sym(dso, map, syms_ss, runtime_ss, filter, kmod);
+        else
                 ret = -1;
-        }
 
         if (ret > 0) {
                 int nr_plt;