perf annotate: Allow annotation for decompressed kernel modules

Decompressing kernel module file for objdump command if needed.
Annotation commands now display annotation for compressed kernel
modules.

Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Acked-by: Namhyung Kim <namhyung@kernel.org>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Corey Ashford <cjashfor@linux.vnet.ibm.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Frederic Weisbecker <fweisbec@gmail.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/n/tip-x4jcytk2d5qjmnjvb0w75q3f@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

diff --git a/tools/perf/util/annotate.c b/tools/perf/util/annotate.c
index 61bf912..b72086e 100644 (file)
--- a/tools/perf/util/annotate.c
+++ b/tools/perf/util/annotate.c
@@ -1008,6 +1008,32 @@ fallback:
                        }
                        filename = symfs_filename;
                }
+       } else if (dso__needs_decompress(dso)) {
+               char tmp[PATH_MAX];
+               struct kmod_path m;
+               int fd;
+               bool ret;
+
+               if (kmod_path__parse_ext(&m, symfs_filename))
+                       goto out_free_filename;
+
+               snprintf(tmp, PATH_MAX, "/tmp/perf-kmod-XXXXXX");
+
+               fd = mkstemp(tmp);
+               if (fd < 0) {
+                       free(m.ext);
+                       goto out_free_filename;
+               }
+
+               ret = decompress_to_file(m.ext, symfs_filename, fd);
+
+               free(m.ext);
+               close(fd);
+
+               if (!ret)
+                       goto out_free_filename;
+
+               strcpy(symfs_filename, tmp);
        }
 
        snprintf(command, sizeof(command),
@@ -1027,7 +1053,7 @@ fallback:
 
        file = popen(command, "r");
        if (!file)
-               goto out_free_filename;
+               goto out_remove_tmp;
 
        while (!feof(file))
                if (symbol__parse_objdump_line(sym, map, file, privsize,
@@ -1042,6 +1068,10 @@ fallback:
                delete_last_nop(sym);
 
        pclose(file);
+
+out_remove_tmp:
+       if (dso__needs_decompress(dso))
+               unlink(symfs_filename);
 out_free_filename:
        if (delete_extract)
                kcore_extract__delete(&kce);