netdev - Re: [PATCH bpf-next v8 09/10] tools/bpf: add a test for bpf_get

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Message-ID: <CAH3MdRVpmJE9gqz=41fddmxjRw_ZF0sAqiewEHnYxWYij0jfew@mail.gmail.com>
Date:   Sat, 28 Apr 2018 11:17:30 -0700
From:   Y Song <ys114321@...il.com>
To:     Alexei Starovoitov <alexei.starovoitov@...il.com>
Cc:     Yonghong Song <yhs@...com>, Alexei Starovoitov <ast@...com>,
        Daniel Borkmann <daniel@...earbox.net>,
        netdev <netdev@...r.kernel.org>, kernel-team@...com
Subject: Re: [PATCH bpf-next v8 09/10] tools/bpf: add a test for bpf_get_stack
 with raw tracepoint prog

On Sat, Apr 28, 2018 at 9:56 AM, Alexei Starovoitov
<alexei.starovoitov@...il.com> wrote:
> On Sat, Apr 28, 2018 at 12:02:04AM -0700, Yonghong Song wrote:
>> The test attached a raw_tracepoint program to sched/sched_switch.
>> It tested to get stack for user space, kernel space and user
>> space with build_id request. It also tested to get user
>> and kernel stack into the same buffer with back-to-back
>> bpf_get_stack helper calls.
>>
>> Whenever the kernel stack is available, the user space
>> application will check to ensure that the kernel function
>> for raw_tracepoint ___bpf_prog_run is part of the stack.
>>
>> Signed-off-by: Yonghong Song <yhs@...com>
> ...
>> +static int get_stack_print_output(void *data, int size)
>> +{
>> +     bool good_kern_stack = false, good_user_stack = false;
>> +     const char *expected_func = "___bpf_prog_run";
>
> so the test works with interpreter only?
> I guess that's ok for now, but needs to fixed for
> configs with CONFIG_BPF_JIT_ALWAYS_ON=y

I did not test CONFIG_BPF_JIT_ALWAYS_ON=y.
I can have a followup patch for this if the patch set does not need respin.