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To: Brendan Gregg <brendan.d.gregg@gmail.com>
Cc: Richard Henderson <rth@redhat.com>, systemtap@sourceware.org,        iovisor-dev@lists.iovisor.org,        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
Subject: Re: BPF runtime for systemtap
References: <72b69807-4cd7-afab-0acd-51af8c76469e@redhat.com>	<CAE40pdftVg+vuDpYhwsuBj_Ptk9P+TrB3M4GDB0xtvEqxYEt2Q@mail.gmail.com>
From: fche@redhat.com (Frank Ch. Eigler)
Date: Wed, 15 Jun 2016 01:50:00 -0000
In-Reply-To: <CAE40pdftVg+vuDpYhwsuBj_Ptk9P+TrB3M4GDB0xtvEqxYEt2Q@mail.gmail.com> (Brendan Gregg's message of "Tue, 14 Jun 2016 16:53:58 -0700")
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brendan.d.gregg wrote:

> [...]
> Great! Is there a hello world example in there somewhere? I found this:
> [...]

Yup.  Here is a smoke test.  (A great many other things are not yet
working.)

% sudo ./stap  -v  --runtime=bpf -e 'global foo
    probe kprobe.function("vfs_read"), kprobe.function("do_select") { foo++ } 
    probe begin { printf("systemtap starting probe\n") }
    probe end { printf("systemtap ending probe\n"); printf("foo = %d\n", foo) }'

Pass 1: parsed user script and 35 library scripts using 198460virt/15804res/6416shr/9208data kb, in 0usr/0sys/71real ms.
Pass 2: analyzed script: 4 probes, 0 functions, 0 embeds, 1 global using 198460virt/15804res/6416shr/9208data kb, in 0usr/0sys/0real ms.
Pass 4: compiled BPF into "stap_32349.bo" in 0usr/0sys/0real ms.
Pass 5: starting run.
systemtap starting probe
^Csystemtap ending probe
foo = 108812
Pass 5: run completed in 0usr/10sys/2525real ms.