linux-kernel - [PATCH v4 5/9] perf tools: Decompress kernel module when reading DSO data

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Date:   Thu,  8 Jun 2017 16:31:05 +0900
From:   Namhyung Kim <namhyung@...nel.org>
To:     Arnaldo Carvalho de Melo <acme@...nel.org>
Cc:     Ingo Molnar <mingo@...nel.org>,
        Peter Zijlstra <a.p.zijlstra@...llo.nl>,
        Jiri Olsa <jolsa@...nel.org>,
        LKML <linux-kernel@...r.kernel.org>, kernel-team@....com,
        David Ahern <dsahern@...il.com>,
        Adrian Hunter <adrian.hunter@...el.com>,
        Wang Nan <wangnan0@...wei.com>
Subject: [PATCH v4 5/9] perf tools: Decompress kernel module when reading DSO data

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

Signed-off-by: Namhyung Kim <namhyung@...nel.org>
---
 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 b346b8eba65c..c63525d845c5 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;
 }
-- 
2.13.1