linux-kernel - Re: Why do kprobes and uprobes singlestep?

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Message-Id: <EECBE373-7CA1-4ED8-9F03-406BBED607FD@amacapital.net>
Date:   Tue, 2 Mar 2021 13:02:57 -0800
From:   Andy Lutomirski <luto@...capital.net>
To:     Alexei Starovoitov <alexei.starovoitov@...il.com>
Cc:     Andy Lutomirski <luto@...nel.org>, bpf <bpf@...r.kernel.org>,
        Oleg Nesterov <oleg@...hat.com>,
        Masami Hiramatsu <mhiramat@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Anil S Keshavamurthy <anil.s.keshavamurthy@...el.com>,
        "David S. Miller" <davem@...emloft.net>, X86 ML <x86@...nel.org>,
        Andrew Cooper <andrew.cooper3@...rix.com>
Subject: Re: Why do kprobes and uprobes singlestep?


> On Mar 2, 2021, at 12:24 PM, Alexei Starovoitov <alexei.starovoitov@...il.com> wrote:
> 
> On Tue, Mar 2, 2021 at 10:38 AM Andy Lutomirski <luto@...nel.org> wrote:
>> 
>> Is there something like a uprobe test suite?  How maintained /
>> actively used is uprobe?
> 
> uprobe+bpf is heavily used in production.
> selftests/bpf has only one test for it though.
> 
> Why are you asking?

Because the integration with the x86 entry code is a mess, and I want to know whether to mark it BROKEN or how to make sure the any cleanups actually work.