linux-kernel - [tip:perf/core] perf tools: Fix copyfile

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Date:   Wed, 17 Jan 2018 08:26:52 -0800
From:   tip-bot for Jiri Olsa <tipbot@...or.com>
To:     linux-tip-commits@...r.kernel.org
Cc:     jolsa@...nel.org, linux-kernel@...r.kernel.org,
        peterz@...radead.org, ak@...ux.intel.com, namhyung@...nel.org,
        hpa@...or.com, acme@...hat.com, tglx@...utronix.de,
        alexander.shishkin@...ux.intel.com, mingo@...nel.org,
        dsahern@...il.com
Subject: [tip:perf/core] perf tools: Fix copyfile_offset update of output
 offset

Commit-ID:  fa1195ccc0af2d121abe0fe266a1caee8c265eea
Gitweb:     https://git.kernel.org/tip/fa1195ccc0af2d121abe0fe266a1caee8c265eea
Author:     Jiri Olsa <jolsa@...nel.org>
AuthorDate: Tue, 9 Jan 2018 14:39:23 +0100
Committer:  Arnaldo Carvalho de Melo <acme@...hat.com>
CommitDate: Fri, 12 Jan 2018 16:57:16 -0300

perf tools: Fix copyfile_offset update of output offset

We need to increase output offset in each iteration, not decrease it as
we currently do.

I guess we were lucky to finish in most cases in first iteration, so the
bug never showed. However it shows a lot when working with big (~4GB)
size data.

Signed-off-by: Jiri Olsa <jolsa@...nel.org>
Cc: Alexander Shishkin <alexander.shishkin@...ux.intel.com>
Cc: Andi Kleen <ak@...ux.intel.com>
Cc: David Ahern <dsahern@...il.com>
Cc: Namhyung Kim <namhyung@...nel.org>
Cc: Peter Zijlstra <peterz@...radead.org>
Fixes: 9c9f5a2f1944 ("perf tools: Introduce copyfile_offset() function")
Link: http://lkml.kernel.org/r/20180109133923.25406-1-jolsa@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>
---
 tools/perf/util/util.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/perf/util/util.c b/tools/perf/util/util.c
index a789f95..443892d 100644
--- a/tools/perf/util/util.c
+++ b/tools/perf/util/util.c
@@ -210,7 +210,7 @@ static int copyfile_offset(int ifd, loff_t off_in, int ofd, loff_t off_out, u64
 
 		size -= ret;
 		off_in += ret;
-		off_out -= ret;
+		off_out += ret;
 	}
 	munmap(ptr, off_in + size);