linux-kernel - Re: [PATCH v2] bpf: BPF based latency tracing

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Message-ID: <5584B9A5.9030602@plumgrid.com>
Date:	Fri, 19 Jun 2015 17:53:57 -0700
From:	Alexei Starovoitov <ast@...mgrid.com>
To:	Daniel Wagner <daniel.wagner@...-carit.de>
CC:	"David S. Miller" <davem@...emloft.net>,
	Daniel Borkmann <daniel@...earbox.net>,
	Ingo Molnar <mingo@...nel.org>, linux-kernel@...r.kernel.org,
	netdev@...r.kernel.org
Subject: Re: [PATCH v2] bpf: BPF based latency tracing

On 6/19/15 7:00 AM, Daniel Wagner wrote:
> BPF offers another way to generate latency histograms. We attach
> kprobes at trace_preempt_off and trace_preempt_on and calculate the
> time it takes to from seeing the off/on transition.
...
> Signed-off-by: Daniel Wagner <daniel.wagner@...-carit.de>
...
> With the rebase on net-next no additinal patches are needed and this
> thing here runs fine.
...
> samples/bpf/Makefile       |   4 ++
>   samples/bpf/lathist_kern.c |  99 +++++++++++++++++++++++++++++++++++++++++++
>   samples/bpf/lathist_user.c | 103 +++++++++++++++++++++++++++++++++++++++++++++
>   3 files changed, 206 insertions(+)
>   create mode 100644 samples/bpf/lathist_kern.c
>   create mode 100644 samples/bpf/lathist_user.c

Thanks. That's a useful example.
Acked-by: Alexei Starovoitov <ast@...mgrid.com>

Dave,
this patch is for net-next and I hope it's not too late
for this merge window.

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