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Date: Thu, 24 Dec 2020 00:40:06 +0000 From: patchwork-bot+netdevbpf@...nel.org To: Andrii Nakryiko <andrii@...nel.org> Cc: bpf@...r.kernel.org, netdev@...r.kernel.org, ast@...com, daniel@...earbox.net, kernel-team@...com, songliubraving@...com Subject: Re: [PATCH v2 bpf] selftests/bpf: work-around EBUSY errors from hashmap update/delete Hello: This patch was applied to bpf/bpf.git (refs/heads/master): On Wed, 23 Dec 2020 12:06:52 -0800 you wrote: > 20b6cc34ea74 ("bpf: Avoid hashtab deadlock with map_locked") introduced > a possibility of getting EBUSY error on lock contention, which seems to happen > very deterministically in test_maps when running 1024 threads on low-CPU > machine. In libbpf CI case, it's a 2 CPU VM and it's hitting this 100% of the > time. Work around by retrying on EBUSY (and EAGAIN, while we are at it) after > a small sleep. sched_yield() is too agressive and fails even after 20 retries, > so I went with usleep(1) for backoff. > > [...] Here is the summary with links: - [v2,bpf] selftests/bpf: work-around EBUSY errors from hashmap update/delete https://git.kernel.org/bpf/bpf/c/11b844b0b7c7 You are awesome, thank you! -- Deet-doot-dot, I am a bot. https://korg.docs.kernel.org/patchwork/pwbot.html
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