Hello:
This patch was applied to bpf/bpf-next.git (master)
by Alexei Starovoitov <ast@xxxxxxxxxx>:
On Wed, 27 Mar 2024 11:20:22 +0800 you wrote:
> Following the recent upgrade of one of our BPF programs, we encountered
> significant latency spikes affecting other applications running on the same
> host. After thorough investigation, we identified that these spikes were
> primarily caused by the prolonged duration required to free a
> non-preallocated htab with approximately 2 million keys.
>
> Notably, our kernel configuration lacks the presence of CONFIG_PREEMPT. In
> scenarios where kernel execution extends excessively, other threads might
> be starved of CPU time, resulting in latency issues across the system. To
> mitigate this, we've adopted a proactive approach by incorporating
> cond_resched() calls within the kernel code. This ensures that during
> lengthy kernel operations, the scheduler is invoked periodically to provide
> opportunities for other threads to execute.
>
> [...]
Here is the summary with links:
- [bpf-next,v2,1/1] bpf: Mitigate latency spikes associated with freeing non-preallocated htab
https://git.kernel.org/bpf/bpf-next/c/cb7b8322017e
You are awesome, thank you!
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