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

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Date:	Tue, 23 Jun 2015 06:10:31 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	ast@...mgrid.com
Cc:	daniel.wagner@...-carit.de, daniel@...earbox.net, mingo@...nel.org,
	linux-kernel@...r.kernel.org, netdev@...r.kernel.org
Subject: Re: [PATCH v2] bpf: BPF based latency tracing

From: Alexei Starovoitov <ast@...mgrid.com>
Date: Fri, 19 Jun 2015 17:53:57 -0700

> 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>

Applied, thanks.
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