Pass external callchain entry to get_perf_callchain #6176
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From bpf stack map, we want to use our own buffers to avoid unnecessary copy, so let us pass it directly. BPF will use this in the next patch. Signed-off-by: Tao Chen <[email protected]>
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As Alexei noted, get_perf_callchain() return values may be reused if a task is preempted after the BPF program enters migrate disable mode. Drawing on the per-cpu design of bpf_bprintf_buffers, per-cpu BPF callchain entry is used here. Signed-off-by: Tao Chen <[email protected]>
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Pull request for series with
subject: Pass external callchain entry to get_perf_callchain
version: 3
url: https://patchwork.kernel.org/project/netdevbpf/list/?series=1013305