linux-kernel - Re: [PATCH v3 bpf-next 1/4] tracing/probe: Add PERF_EVENT_IOC_QUERY

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Date:   Tue, 20 Aug 2019 16:45:03 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Daniel Xu <dxu@...uu.xyz>
Cc:     bpf@...r.kernel.org, songliubraving@...com, yhs@...com,
        andriin@...com, mingo@...hat.com, acme@...nel.org, ast@...com,
        alexander.shishkin@...ux.intel.com, jolsa@...hat.com,
        namhyung@...nel.org, linux-kernel@...r.kernel.org,
        kernel-team@...com
Subject: Re: [PATCH v3 bpf-next 1/4] tracing/probe: Add
 PERF_EVENT_IOC_QUERY_PROBE ioctl

On Fri, Aug 16, 2019 at 03:31:46PM -0700, Daniel Xu wrote:
> It's useful to know [uk]probe's nmissed and nhit stats. For example with
> tracing tools, it's important to know when events may have been lost.
> debugfs currently exposes a control file to get this information, but
> it is not compatible with probes registered with the perf API.

What is this nmissed and nhit stuff?