From fa1195ccc0af2d121abe0fe266a1caee8c265eea Mon Sep 17 00:00:00 2001 From: Jiri Olsa Date: Tue, 9 Jan 2018 14:39:23 +0100 Subject: [PATCH] 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 Cc: Alexander Shishkin Cc: Andi Kleen Cc: David Ahern Cc: Namhyung Kim Cc: Peter Zijlstra 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 --- 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 a789f952b3e9b..443892dabedbe 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);