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authorJiri Olsa <jolsa@kernel.org>2018-08-17 11:48:10 +0200
committerArnaldo Carvalho de Melo <acme@redhat.com>2018-08-20 08:54:59 -0300
commit8b42b7e5e8b5692bc5e57342bf00c40d64978407 (patch)
tree92cf5327174b5136e4ab83f080f4c3cad98c87cc
parentc9a8a6131fb68f6eabec34fd855e69b4855155e4 (diff)
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perf tools: Add is_compressed callback to compressions array
Add is_compressed callback to the compressions array, that returns 0 if the file is compressed or != 0 if not. The new callback is used to recognize the situation when we have a 'compressed' object, like: /lib/modules/.../drivers/net/ethernet/intel/igb/igb.ko.xz but we need to read its debug data from debuginfo files, which might not be compressed, like: /root/.debug/.build-id/d6/...c4b301f/debug So even for a 'compressed' object we read debug data from a plain uncompressed object. To keep this transparent, we detect this in decompress_kmodule() and return the file descriptor to the uncompressed file. Signed-off-by: Jiri Olsa <jolsa@kernel.org> Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com> Cc: David Ahern <dsahern@gmail.com> Cc: Michael Petlan <mpetlan@redhat.com> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Peter Zijlstra <peterz@infradead.org> Link: http://lkml.kernel.org/r/20180817094813.15086-11-jolsa@kernel.org Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
-rw-r--r--tools/perf/util/compress.h2
-rw-r--r--tools/perf/util/dso.c23
-rw-r--r--tools/perf/util/lzma.c5
-rw-r--r--tools/perf/util/zlib.c6
4 files changed, 33 insertions, 3 deletions
diff --git a/tools/perf/util/compress.h b/tools/perf/util/compress.h
index ecca688a25fb..892e92e7e7fc 100644
--- a/tools/perf/util/compress.h
+++ b/tools/perf/util/compress.h
@@ -4,10 +4,12 @@
#ifdef HAVE_ZLIB_SUPPORT
int gzip_decompress_to_file(const char *input, int output_fd);
+bool gzip_is_compressed(const char *input);
#endif
#ifdef HAVE_LZMA_SUPPORT
int lzma_decompress_to_file(const char *input, int output_fd);
+bool lzma_is_compressed(const char *input);
#endif
#endif /* PERF_COMPRESS_H */
diff --git a/tools/perf/util/dso.c b/tools/perf/util/dso.c
index cbeecf683333..8b9243f13b88 100644
--- a/tools/perf/util/dso.c
+++ b/tools/perf/util/dso.c
@@ -196,15 +196,16 @@ enum {
static const struct {
const char *fmt;
int (*decompress)(const char *input, int output);
+ bool (*is_compressed)(const char *input);
} compressions[] = {
[COMP_ID__NONE] = { .fmt = NULL, },
#ifdef HAVE_ZLIB_SUPPORT
- { "gz", gzip_decompress_to_file },
+ { "gz", gzip_decompress_to_file, gzip_is_compressed },
#endif
#ifdef HAVE_LZMA_SUPPORT
- { "xz", lzma_decompress_to_file },
+ { "xz", lzma_decompress_to_file, lzma_is_compressed },
#endif
- { NULL, NULL },
+ { NULL, NULL, NULL },
};
static int is_supported_compression(const char *ext)
@@ -262,6 +263,22 @@ static int decompress_kmodule(struct dso *dso, const char *name,
if (dso->comp == COMP_ID__NONE)
return -1;
+ /*
+ * We have proper compression id for DSO and yet the file
+ * behind the 'name' can still be plain uncompressed object.
+ *
+ * The reason is behind the logic we open the DSO object files,
+ * when we try all possible 'debug' objects until we find the
+ * data. So even if the DSO is represented by 'krava.xz' module,
+ * we can end up here opening ~/.debug/....23432432/debug' file
+ * which is not compressed.
+ *
+ * To keep this transparent, we detect this and return the file
+ * descriptor to the uncompressed file.
+ */
+ if (!compressions[dso->comp].is_compressed(name))
+ return open(name, O_RDONLY);
+
fd = mkstemp(tmpbuf);
if (fd < 0) {
dso->load_errno = errno;
diff --git a/tools/perf/util/lzma.c b/tools/perf/util/lzma.c
index 07498eaddc08..7032caaf75eb 100644
--- a/tools/perf/util/lzma.c
+++ b/tools/perf/util/lzma.c
@@ -99,3 +99,8 @@ err_fclose:
fclose(infile);
return err;
}
+
+bool lzma_is_compressed(const char *input __maybe_unused)
+{
+ return true;
+}
diff --git a/tools/perf/util/zlib.c b/tools/perf/util/zlib.c
index a725b958cf31..e68317214679 100644
--- a/tools/perf/util/zlib.c
+++ b/tools/perf/util/zlib.c
@@ -5,6 +5,7 @@
#include <sys/stat.h>
#include <sys/mman.h>
#include <zlib.h>
+#include <linux/compiler.h>
#include "util/compress.h"
#include "util/util.h"
@@ -79,3 +80,8 @@ out_close:
return ret == Z_STREAM_END ? 0 : -1;
}
+
+bool gzip_is_compressed(const char *input __maybe_unused)
+{
+ return true;
+}