netdev - Re: [PATCH x86/urgent] bpf: emulate push insns for uprobe on x86

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Message-ID: <526920a7-0329-cc2b-0cae-1af221a48aee@fb.com>
Date:   Wed, 8 Nov 2017 16:10:19 -0800
From:   Yonghong Song <yhs@...com>
To:     David Miller <davem@...emloft.net>
CC:     <mingo@...nel.org>, <tglx@...utronix.de>, <oleg@...hat.com>,
        <peterz@...radead.org>, <linux-kernel@...r.kernel.org>,
        <x86@...nel.org>, <netdev@...r.kernel.org>, <ast@...com>,
        <kernel-team@...com>
Subject: Re: [PATCH x86/urgent] bpf: emulate push insns for uprobe on x86



On 11/8/17 4:06 PM, David Miller wrote:
> From: Yonghong Song <yhs@...com>
> 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.

> 
> Thank you.
>