From 8b42b7e5e8b5692bc5e57342bf00c40d64978407 Mon Sep 17 00:00:00 2001 From: Jiri Olsa Date: Fri, 17 Aug 2018 11:48:10 +0200 Subject: 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 Cc: Alexander Shishkin Cc: David Ahern Cc: Michael Petlan Cc: Namhyung Kim Cc: Peter Zijlstra Link: http://lkml.kernel.org/r/20180817094813.15086-11-jolsa@kernel.org Signed-off-by: Arnaldo Carvalho de Melo --- tools/perf/util/dso.c | 23 ++++++++++++++++++++--- 1 file changed, 20 insertions(+), 3 deletions(-) (limited to 'tools/perf/util/dso.c') 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; -- cgit v1.2.3