From: Alexei Starovoitov <alexei.starovoitov@gmail.com>
To: Andy Lutomirski <luto@amacapital.net>
Cc: Andy Lutomirski <luto@kernel.org>, bpf <bpf@vger.kernel.org>,
Oleg Nesterov <oleg@redhat.com>,
Masami Hiramatsu <mhiramat@kernel.org>,
Peter Zijlstra <peterz@infradead.org>,
LKML <linux-kernel@vger.kernel.org>,
Anil S Keshavamurthy <anil.s.keshavamurthy@intel.com>,
"David S. Miller" <davem@davemloft.net>, X86 ML <x86@kernel.org>,
Andrew Cooper <andrew.cooper3@citrix.com>
Subject: Re: Why do kprobes and uprobes singlestep?
Date: Tue, 2 Mar 2021 17:22:30 -0800 [thread overview]
Message-ID: <CAADnVQJtpvB8wDFv46O0GEaHkwmT1Ea70BJfgS36kDX0u4uZ-g@mail.gmail.com> (raw)
In-Reply-To: <EECBE373-7CA1-4ED8-9F03-406BBED607FD@amacapital.net>
On Tue, Mar 2, 2021 at 1:02 PM Andy Lutomirski <luto@amacapital.net> wrote:
>
>
> > On Mar 2, 2021, at 12:24 PM, Alexei Starovoitov <alexei.starovoitov@gmail.com> wrote:
> >
> > On Tue, Mar 2, 2021 at 10:38 AM Andy Lutomirski <luto@kernel.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.
Any test case to repro the issue you found?
Is it a bug or just messy code?
Nowadays a good chunk of popular applications (python, mysql, etc) has
USDTs in them.
Issues reported with bcc:
https://github.com/iovisor/bcc/issues?q=is%3Aissue+USDT
Similar thing with bpftrace.
Both standard USDT and semaphore based are used in the wild.
uprobe for containers has been a long standing feature request.
If you can improve uprobe performance that would be awesome.
That's another thing that people report often. We optimized it a bit.
More can be done.
next prev parent reply other threads:[~2021-03-03 3:56 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <CALCETrXzXv-V3A3SpN_Pdj_PNG8Gw0AVsZD7+VO-q_xCAu2T2A@mail.gmail.com>
[not found] ` <20210301165130.GA5351@redhat.com>
[not found] ` <CALCETrU2Rc4ejSoYyWgbk00U8tSc=aZDaj0mm+Ep62wOirZG7g@mail.gmail.com>
2021-03-02 20:24 ` Why do kprobes and uprobes singlestep? Alexei Starovoitov
2021-03-02 21:02 ` Andy Lutomirski
2021-03-03 1:22 ` Alexei Starovoitov [this message]
2021-03-03 1:46 ` Andy Lutomirski
2021-03-03 2:18 ` Alexei Starovoitov
2021-03-03 13:27 ` Oleg Nesterov
2021-03-03 18:11 ` Daniel Xu
2021-03-03 19:14 ` Andy Lutomirski
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