From: Peter Zijlstra <peterz@infradead.org>
To: Daniel Xu <dxu@dxuuu.xyz>
Cc: bpf@vger.kernel.org, songliubraving@fb.com, yhs@fb.com,
andriin@fb.com, mingo@redhat.com, acme@kernel.org, ast@fb.com,
alexander.shishkin@linux.intel.com, jolsa@redhat.com,
namhyung@kernel.org, linux-kernel@vger.kernel.org,
kernel-team@fb.com
Subject: Re: [PATCH v3 bpf-next 1/4] tracing/probe: Add PERF_EVENT_IOC_QUERY_PROBE ioctl
Date: Tue, 20 Aug 2019 16:45:03 +0200 [thread overview]
Message-ID: <20190820144503.GV2332@hirez.programming.kicks-ass.net> (raw)
In-Reply-To: <20190816223149.5714-2-dxu@dxuuu.xyz>
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?
next prev parent reply other threads:[~2019-08-20 14:45 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-08-16 22:31 [PATCH v3 bpf-next 0/4] tracing/probe: Add PERF_EVENT_IOC_QUERY_PROBE Daniel Xu
2019-08-16 22:31 ` [PATCH v3 bpf-next 1/4] tracing/probe: Add PERF_EVENT_IOC_QUERY_PROBE ioctl Daniel Xu
2019-08-19 18:22 ` kbuild test robot
2019-08-20 1:26 ` Alexei Starovoitov
2019-08-20 2:34 ` Daniel Xu
2019-08-20 2:52 ` Alexei Starovoitov
2019-08-20 2:04 ` kbuild test robot
2019-08-20 14:45 ` Peter Zijlstra [this message]
2019-08-20 17:58 ` Daniel Xu
2019-08-21 11:08 ` Peter Zijlstra
2019-08-21 16:54 ` Yonghong Song
2019-08-21 18:31 ` Peter Zijlstra
2019-08-21 18:43 ` Yonghong Song
2019-08-21 20:04 ` Arnaldo Carvalho de Melo
2019-08-22 7:47 ` Peter Zijlstra
2019-08-22 7:54 ` Song Liu
2019-08-22 9:05 ` Peter Zijlstra
2019-08-22 21:08 ` Daniel Xu
2019-08-21 20:07 ` Arnaldo Carvalho de Melo
2019-08-21 22:10 ` Yonghong Song
2019-08-16 22:31 ` [PATCH v3 bpf-next 2/4] libbpf: Add helpers to extract perf fd from bpf_link Daniel Xu
2019-08-19 17:45 ` Andrii Nakryiko
2019-08-19 21:30 ` Daniel Xu
2019-08-16 22:31 ` [PATCH v3 bpf-next 3/4] tracing/probe: Sync perf_event.h to tools Daniel Xu
2019-08-16 22:31 ` [PATCH v3 bpf-next 4/4] tracing/probe: Add self test for PERF_EVENT_IOC_QUERY_PROBE Daniel Xu
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