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

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Message-Id: <20171109.090647.824552877953564084.davem@davemloft.net>
Date:   Thu, 09 Nov 2017 09:06:47 +0900 (KST)
From:   David Miller <davem@...emloft.net>
To:     yhs@...com
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

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.

Thank you.