On 11/8/17 10:53 PM, Thomas Gleixner wrote:
> On Wed, 8 Nov 2017, Yonghong Song wrote:
>> On 11/8/17 4:06 PM, David Miller wrote:
>>> From: Yonghong Song <[email protected]>
>>> Date: Wed, 8 Nov 2017 13:37:12 -0800
>>>
>>>> Uprobe is a tracing mechanism for userspace programs.
>>>> Typical uprobe will incur overhead of two traps.
>>>> First trap is caused by replaced trap insn, and
>>>> the second trap is to execute the original displaced
>>>> insn in user space.
>>> ...
>>>
>>> I don't understand how this is bpf related, and if it is you don't
>>> explain it well in the commit message.
>>
>> Right. This is not related to bpf. Will remove the "bpf" from the subject line
>> in the next revision.
>
> The proper subject is something like:
>
> [PATCH] uprobes/x86: .......
Thanks, Thomas,
I will fix the subject etc. Previously, I added x86/urgent as the branch
I did my test on top of it (similar to net-next). I will add that
information in the comments and re-submit.
>
> which you can figure out by looking at the subsystem prefixes via
>
> git log arch/x86/kernel/uprobes.c
>
> Note, that it says [PATCH} and nothing else. That patch is a nice
> performance improvement, but certainly not x86/urgent material. x86/urgent
> is for bug and regression fixes.
>
> Thanks,
>
> tglx
>
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