linux-kernel - [PATCH v2 1/5] selftests/bpf: enlarge select() timeout for test

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Message-ID: <20210820015556.23276-2-lizhijian@cn.fujitsu.com>
Date:   Fri, 20 Aug 2021 09:55:53 +0800
From:   Li Zhijian <lizhijian@...fujitsu.com>
To:     <shuah@...nel.org>, <linux-kselftest@...r.kernel.org>,
        <netdev@...r.kernel.org>, <bpf@...r.kernel.org>
CC:     <ast@...nel.org>, <daniel@...earbox.net>, <andrii@...nel.org>,
        <kafai@...com>, <songliubraving@...com>, <yhs@...com>,
        <kpsingh@...nel.org>, <linux-kernel@...r.kernel.org>,
        <philip.li@...el.com>, <yifeix.zhu@...el.com>,
        Li Zhijian <lizhijian@...fujitsu.com>,
        "kernel test robot" <lkp@...el.com>
Subject: [PATCH v2 1/5] selftests/bpf: enlarge select() timeout for test_maps

0Day robot observed that it's easily timeout on a heavy load host.
-------------------
 # selftests: bpf: test_maps
 # Fork 1024 tasks to 'test_update_delete'
 # Fork 1024 tasks to 'test_update_delete'
 # Fork 100 tasks to 'test_hashmap'
 # Fork 100 tasks to 'test_hashmap_percpu'
 # Fork 100 tasks to 'test_hashmap_sizes'
 # Fork 100 tasks to 'test_hashmap_walk'
 # Fork 100 tasks to 'test_arraymap'
 # Fork 100 tasks to 'test_arraymap_percpu'
 # Failed sockmap unexpected timeout
 not ok 3 selftests: bpf: test_maps # exit=1
 # selftests: bpf: test_lru_map
 # nr_cpus:8
-------------------
Since this test will be scheduled by 0Day to a random host that could have
only a few cpus(2-8), enlarge the timeout to avoid a false NG report.

In practice, i tried to pin it to only one cpu by 'taskset 0x01 ./test_maps',
and knew 10S is likely enough, but i still perfer to a larger value 30.

Reported-by: kernel test robot <lkp@...el.com>
Signed-off-by: Li Zhijian <lizhijian@...fujitsu.com>
Acked-by: Song Liu <songliubraving@...com>

---
V2: update to 30 seconds
3S is not enough sometimes on a very busy host
taskset 1,1 ./test_maps 9
Fork 1024 tasks to 'test_update_delete'
Fork 1024 tasks to 'test_update_delete'
Fork 100 tasks to 'test_hashmap'
Fork 100 tasks to 'test_hashmap_percpu'
Fork 100 tasks to 'test_hashmap_sizes'
Fork 100 tasks to 'test_hashmap_walk'
Fork 100 tasks to 'test_arraymap'
Fork 100 tasks to 'test_arraymap_percpu'
Failed sockmap unexpected timeout

taskset 1,1 ./test_maps 10
Fork 1024 tasks to 'test_update_delete'
Fork 1024 tasks to 'test_update_delete'
Fork 100 tasks to 'test_hashmap'
Fork 100 tasks to 'test_hashmap_percpu'
Fork 100 tasks to 'test_hashmap_sizes'
Fork 100 tasks to 'test_hashmap_walk'
Fork 100 tasks to 'test_arraymap'
Fork 100 tasks to 'test_arraymap_percpu'
Fork 1024 tasks to 'test_update_delete'
Fork 1024 tasks to 'test_update_delete'
Fork 100 tasks to 'test_hashmap'
Fork 100 tasks to 'test_hashmap_percpu'
Fork 100 tasks to 'test_hashmap_sizes'
Fork 100 tasks to 'test_hashmap_walk'
Fork 100 tasks to 'test_arraymap'
Fork 100 tasks to 'test_arraymap_percpu'
test_array_map_batch_ops:PASS
test_array_percpu_map_batch_ops:PASS
test_htab_map_batch_ops:PASS
test_htab_percpu_map_batch_ops:PASS
test_lpm_trie_map_batch_ops:PASS
test_sk_storage_map:PASS
test_maps: OK, 0 SKIPPED

taskset 0x01 ./test_maps 9
Fork 1024 tasks to 'test_update_delete'
Fork 1024 tasks to 'test_update_delete'
Fork 100 tasks to 'test_hashmap'
Fork 100 tasks to 'test_hashmap_percpu'
Fork 100 tasks to 'test_hashmap_sizes'
Fork 100 tasks to 'test_hashmap_walk'
Fork 100 tasks to 'test_arraymap'
Fork 100 tasks to 'test_arraymap_percpu'
Fork 1024 tasks to 'test_update_delete'
Fork 1024 tasks to 'test_update_delete'
Fork 100 tasks to 'test_hashmap'
Fork 100 tasks to 'test_hashmap_percpu'
Fork 100 tasks to 'test_hashmap_sizes'
Fork 100 tasks to 'test_hashmap_walk'
Fork 100 tasks to 'test_arraymap'
Fork 100 tasks to 'test_arraymap_percpu'
test_array_map_batch_ops:PASS
test_array_percpu_map_batch_ops:PASS
test_htab_map_batch_ops:PASS
test_htab_percpu_map_batch_ops:PASS
test_lpm_trie_map_batch_ops:PASS
test_sk_storage_map:PASS
test_maps: OK, 0 SKIPPED

taskset 0x01 ./test_maps 10
Fork 1024 tasks to 'test_update_delete'
Fork 1024 tasks to 'test_update_delete'
Fork 100 tasks to 'test_hashmap'
Fork 100 tasks to 'test_hashmap_percpu'
Fork 100 tasks to 'test_hashmap_sizes'
Fork 100 tasks to 'test_hashmap_walk'
Fork 100 tasks to 'test_arraymap'
Fork 100 tasks to 'test_arraymap_percpu'
Fork 1024 tasks to 'test_update_delete'
Fork 1024 tasks to 'test_update_delete'
Fork 100 tasks to 'test_hashmap'
Fork 100 tasks to 'test_hashmap_percpu'
Fork 100 tasks to 'test_hashmap_sizes'
Fork 100 tasks to 'test_hashmap_walk'
Fork 100 tasks to 'test_arraymap'
Fork 100 tasks to 'test_arraymap_percpu'
test_array_map_batch_ops:PASS
test_array_percpu_map_batch_ops:PASS
test_htab_map_batch_ops:PASS
test_htab_percpu_map_batch_ops:PASS
test_lpm_trie_map_batch_ops:PASS
test_sk_storage_map:PASS
test_maps: OK, 0 SKIPPED
---
 tools/testing/selftests/bpf/test_maps.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/testing/selftests/bpf/test_maps.c b/tools/testing/selftests/bpf/test_maps.c
index 30cbf5d98f7d..de58a3070eea 100644
--- a/tools/testing/selftests/bpf/test_maps.c
+++ b/tools/testing/selftests/bpf/test_maps.c
@@ -985,7 +985,7 @@ static void test_sockmap(unsigned int tasks, void *data)
 
 		FD_ZERO(&w);
 		FD_SET(sfd[3], &w);
-		to.tv_sec = 1;
+		to.tv_sec = 30;
 		to.tv_usec = 0;
 		s = select(sfd[3] + 1, &w, NULL, NULL, &to);
 		if (s == -1) {
-- 
2.32.0