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authorJesper Dangaard Brouer <brouer@redhat.com>2020-08-26 11:17:36 +0300
committerDaniel Borkmann <daniel@iogearbox.net>2020-08-28 14:58:19 +0300
commitfa4505675e093e895b7ec49a76d44f6b5ad9602e (patch)
treebddd75fbe80efe818d4d2ada27ba2823095bcd2b /tools
parent7787b6fc938e16aa418613c4a765c1dbb268ed9f (diff)
downloadlinux-fa4505675e093e895b7ec49a76d44f6b5ad9602e.tar.xz
selftests/bpf: Fix massive output from test_maps
When stdout output from the selftests tool 'test_maps' gets redirected into e.g file or pipe, then the output lines increase a lot (from 21 to 33949 lines). This is caused by the printf that happens before the fork() call, and there are user-space buffered printf data that seems to be duplicated into the forked process. To fix this fflush() stdout before the fork loop in __run_parallel(). Fixes: 1a97cf1fe503 ("selftests/bpf: speedup test_maps") Signed-off-by: Jesper Dangaard Brouer <brouer@redhat.com> Signed-off-by: Daniel Borkmann <daniel@iogearbox.net> Link: https://lore.kernel.org/bpf/159842985651.1050885.2154399297503372406.stgit@firesoul
Diffstat (limited to 'tools')
-rw-r--r--tools/testing/selftests/bpf/test_maps.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/tools/testing/selftests/bpf/test_maps.c b/tools/testing/selftests/bpf/test_maps.c
index 754cf611723e..0d92ebcb335d 100644
--- a/tools/testing/selftests/bpf/test_maps.c
+++ b/tools/testing/selftests/bpf/test_maps.c
@@ -1274,6 +1274,8 @@ static void __run_parallel(unsigned int tasks,
pid_t pid[tasks];
int i;
+ fflush(stdout);
+
for (i = 0; i < tasks; i++) {
pid[i] = fork();
if (pid[i] == 0) {