linux-kernel - [PATCH v2 2/3] perf tools: Decompress kernel module when reading DSO data

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Date:   Sat,  3 Jun 2017 11:00:32 +0900
From:   Namhyung Kim <namhyung@...nel.org>
To:     Arnaldo Carvalho de Melo <acme@...nel.org>
Cc:     Ingo Molnar <mingo@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        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>
Subject: [PATCH v2 2/3] 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, 15 insertions(+), 1 deletion(-)

diff --git a/tools/perf/util/dso.c b/tools/perf/util/dso.c
index fc4747a8c283..77e5701e38b9 100644
--- a/tools/perf/util/dso.c
+++ b/tools/perf/util/dso.c
@@ -463,8 +463,22 @@ static int __open_dso(struct dso *dso, struct machine *machine)
 		return -EINVAL;
 	}
 
-	if (!is_regular_file(name))
+	if (!is_regular_file(name)) {
+		free(name);
 		return -EINVAL;
+	}
+
+	if (dso__needs_decompress(dso)) {
+		char newpath[32];
+		size_t len = sizeof(newpath);
+
+		if (dso__decompress_kmodule_path(dso, name, newpath, len) < 0) {
+			free(name);
+			return -1;
+		}
+
+		strcpy(name, newpath);
+	}
 
 	fd = do_open(name);
 	free(name);
-- 
2.13.0