feat(perf): Compute sample deltas without per-tick counter reset#184
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Reuse persistent perf read buffers per CPU/group context and replace the per-sample PERF_EVENT_IOC_RESET ioctl with userspace delta computation.
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This PR refactors the perf sampling path to reduce per-sample overhead :
PERF_EVENT_IOC_RESETafter each perf read and computes counter deltas in userspace instead.The startup reset/enable flow is kept unchanged, so first-sample behavior remains consistent with the previous implementation.