linux-kernel - [tip:perf/urgent] perf tools: Decompress kernel module when reading DSO data

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Date:   Thu, 8 Jun 2017 15:51:44 -0700
From:   tip-bot for Namhyung Kim <tipbot@...or.com>
To:     linux-tip-commits@...r.kernel.org
Cc:     tglx@...utronix.de, linux-kernel@...r.kernel.org,
        namhyung@...nel.org, mingo@...nel.org, dsahern@...il.com,
        jolsa@...nel.org, a.p.zijlstra@...llo.nl, acme@...hat.com,
        adrian.hunter@...el.com, hpa@...or.com, wangnan0@...wei.com
Subject: [tip:perf/urgent] perf tools: Decompress kernel module when reading
 DSO data

Commit-ID:  1d6b3c9ba756a5134fd7ad1959acac776d17404b
Gitweb:     http://git.kernel.org/tip/1d6b3c9ba756a5134fd7ad1959acac776d17404b
Author:     Namhyung Kim <namhyung@...nel.org>
AuthorDate: Thu, 8 Jun 2017 16:31:05 +0900
Committer:  Arnaldo Carvalho de Melo <acme@...hat.com>
CommitDate: Thu, 8 Jun 2017 15:39:07 -0300

perf tools: Decompress kernel module when reading DSO data

Currently perf decompresses kernel modules when loading the symbol table
but it missed to do it when reading raw data.

Signed-off-by: Namhyung Kim <namhyung@...nel.org>
Acked-by: Jiri Olsa <jolsa@...nel.org>
Cc: Adrian Hunter <adrian.hunter@...el.com>
Cc: David Ahern <dsahern@...il.com>
Cc: Peter Zijlstra <a.p.zijlstra@...llo.nl>
Cc: Wang Nan <wangnan0@...wei.com>
Cc: kernel-team@....com
Link: http://lkml.kernel.org/r/20170608073109.30699-6-namhyung@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>
---
 tools/perf/util/dso.c | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/tools/perf/util/dso.c b/tools/perf/util/dso.c
index b346b8e..c63525d 100644
--- a/tools/perf/util/dso.c
+++ b/tools/perf/util/dso.c
@@ -475,7 +475,23 @@ static int __open_dso(struct dso *dso, struct machine *machine)
 		return -EINVAL;
 	}
 
+	if (dso__needs_decompress(dso)) {
+		char newpath[KMOD_DECOMP_LEN];
+		size_t len = sizeof(newpath);
+
+		if (dso__decompress_kmodule_path(dso, name, newpath, len) < 0) {
+			free(name);
+			return -dso->load_errno;
+		}
+
+		strcpy(name, newpath);
+	}
+
 	fd = do_open(name);
+
+	if (dso__needs_decompress(dso))
+		unlink(name);
+
 	free(name);
 	return fd;
 }