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selftests/bpf: Close cgrp fd before calling cleanup_cgroup_environment()
There is error log when htab-mem benchmark completes. The error log looks as follows: $ ./bench htab-mem -d1 Setting up benchmark 'htab-mem'... Benchmark 'htab-mem' started. ...... (cgroup_helpers.c:353: errno: Device or resource busy) umount cgroup2 Fix it by closing cgrp fd before invoking cleanup_cgroup_environment(). Signed-off-by: Hou Tao <houtao1@huawei.com> Link: https://lore.kernel.org/r/20231219135727.2661527-1-houtao@huaweicloud.com Signed-off-by: Alexei Starovoitov <ast@kernel.org>
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@ -335,6 +335,7 @@ static void htab_mem_report_final(struct bench_res res[], int res_cnt)
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" peak memory usage %7.2lfMiB\n",
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loop_mean, loop_stddev, mem_mean, mem_stddev, peak_mem / 1048576.0);
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close(ctx.fd);
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cleanup_cgroup_environment();
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}
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