linux-kernel - [tip:perf/core] perf symbols: Support to read compressed module from build-id cache

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Date:	Fri, 30 Jan 2015 10:33:37 -0800
From:	tip-bot for Namhyung Kim <tipbot@...or.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	adrian.hunter@...el.com, namhyung@...nel.org, mingo@...nel.org,
	dsahern@...il.com, hpa@...or.com, eranian@...gle.com,
	acme@...hat.com, fweisbec@...il.com, jolsa@...hat.com,
	linux-kernel@...r.kernel.org, tglx@...utronix.de,
	a.p.zijlstra@...llo.nl, andi@...stfloor.org
Subject: [tip:perf/core] perf symbols:
  Support to read compressed module from build-id cache

Commit-ID:  0b064f43001fc2627ff8c3020647b85db040235f
Gitweb:     http://git.kernel.org/tip/0b064f43001fc2627ff8c3020647b85db040235f
Author:     Namhyung Kim <namhyung@...nel.org>
AuthorDate: Thu, 29 Jan 2015 17:06:42 +0900
Committer:  Arnaldo Carvalho de Melo <acme@...hat.com>
CommitDate: Thu, 29 Jan 2015 16:56:54 -0300

perf symbols: Support to read compressed module from build-id cache

The commit c00c48fc6e6e ("perf symbols: Preparation for compressed
kernel module support") added support for compressed kernel modules but
it only supports system path DSOs.  When a dso is read from build-id
cache, its filename doesn't end with ".gz" but has build-id.  In this
case, we should fallback to the original dso->name.

Signed-off-by: Namhyung Kim <namhyung@...nel.org>
Cc: Adrian Hunter <adrian.hunter@...el.com>
Cc: Andi Kleen <andi@...stfloor.org>
Cc: David Ahern <dsahern@...il.com>
Cc: Frederic Weisbecker <fweisbec@...il.com>
Cc: Jiri Olsa <jolsa@...hat.com>
Cc: Peter Zijlstra <a.p.zijlstra@...llo.nl>
Cc: Stephane Eranian <eranian@...gle.com>
Link: http://lkml.kernel.org/r/1422518843-25818-2-git-send-email-namhyung@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>
---
 tools/perf/util/symbol-elf.c | 13 ++++++++-----
 1 file changed, 8 insertions(+), 5 deletions(-)

diff --git a/tools/perf/util/symbol-elf.c b/tools/perf/util/symbol-elf.c
index 06fcd1b..b24f9d8 100644
--- a/tools/perf/util/symbol-elf.c
+++ b/tools/perf/util/symbol-elf.c
@@ -574,13 +574,16 @@ static int decompress_kmodule(struct dso *dso, const char *name,
 	const char *ext = strrchr(name, '.');
 	char tmpbuf[] = "/tmp/perf-kmod-XXXXXX";
 
-	if ((type != DSO_BINARY_TYPE__SYSTEM_PATH_KMODULE_COMP &&
-	     type != DSO_BINARY_TYPE__GUEST_KMODULE_COMP) ||
-	    type != dso->symtab_type)
+	if (type != DSO_BINARY_TYPE__SYSTEM_PATH_KMODULE_COMP &&
+	    type != DSO_BINARY_TYPE__GUEST_KMODULE_COMP &&
+	    type != DSO_BINARY_TYPE__BUILD_ID_CACHE)
 		return -1;
 
-	if (!ext || !is_supported_compression(ext + 1))
-		return -1;
+	if (!ext || !is_supported_compression(ext + 1)) {
+		ext = strrchr(dso->name, '.');
+		if (!ext || !is_supported_compression(ext + 1))
+			return -1;
+	}
 
 	fd = mkstemp(tmpbuf);
 	if (fd < 0)
--
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