From: Jiri Olsa <olsajiri@gmail.com>
To: Peter Zijlstra <peterz@infradead.org>
Cc: Andrii Nakryiko <andrii.nakryiko@gmail.com>,
Jiri Olsa <olsajiri@gmail.com>, Oleg Nesterov <oleg@redhat.com>,
Andrii Nakryiko <andrii@kernel.org>,
bpf@vger.kernel.org, Song Liu <songliubraving@fb.com>,
Yonghong Song <yhs@fb.com>,
John Fastabend <john.fastabend@gmail.com>,
Hao Luo <haoluo@google.com>, Steven Rostedt <rostedt@goodmis.org>,
Masami Hiramatsu <mhiramat@kernel.org>,
Alan Maguire <alan.maguire@oracle.com>,
linux-kernel@vger.kernel.org, linux-trace-kernel@vger.kernel.org
Subject: Re: [RFC perf/core 05/11] uprobes: Add mapping for optimized uprobe trampolines
Date: Tue, 19 Nov 2024 16:15:42 +0100 [thread overview]
Message-ID: <Zzyrnvnw1I8HfAYN@krava> (raw)
In-Reply-To: <20241119091348.GE11903@noisy.programming.kicks-ass.net>
On Tue, Nov 19, 2024 at 10:13:48AM +0100, Peter Zijlstra wrote:
> On Mon, Nov 18, 2024 at 10:06:51PM -0800, Andrii Nakryiko wrote:
>
> > > > Jiri, we could also have an option to support 64-bit call, right? We'd
> > > > need nop9 for that, but it's an option as well to future-proofing this
> > > > approach, no?
> > >
> > > hm, I don't think there's call with relative 64bit offset
> >
> > why do you need a relative, when you have 64 bits? ;) there is a call
> > to absolute address, no?
>
> No, there is not :/ You get to use an indirect call, which means
> multiple instructions and all the speculation joy.
>
> IFF USDT thingies have AX clobbered (I couldn't find in a hurry) then
> patching the multi instruction thing is relatively straight forward, if
> they don't, its going to be a pain.
I don't follow, what's the reason for that?
jirka
next prev parent reply other threads:[~2024-11-19 15:15 UTC|newest]
Thread overview: 51+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-11-05 13:33 [RFC 00/11] uprobes: Add support to optimize usdt probes on x86_64 Jiri Olsa
2024-11-05 13:33 ` [RFC perf/core 01/11] uprobes: Rename arch_uretprobe_trampoline function Jiri Olsa
2024-11-05 13:33 ` [RFC perf/core 02/11] uprobes: Make copy_from_page global Jiri Olsa
2024-11-14 23:40 ` Andrii Nakryiko
2024-11-16 21:41 ` Jiri Olsa
2024-11-05 13:33 ` [RFC perf/core 03/11] uprobes: Add len argument to uprobe_write_opcode Jiri Olsa
2024-11-14 23:41 ` Andrii Nakryiko
2024-11-16 21:41 ` Jiri Olsa
2024-11-05 13:33 ` [RFC perf/core 04/11] uprobes: Add data argument to uprobe_write_opcode function Jiri Olsa
2024-11-14 23:41 ` Andrii Nakryiko
2024-11-16 21:43 ` Jiri Olsa
2024-11-05 13:33 ` [RFC perf/core 05/11] uprobes: Add mapping for optimized uprobe trampolines Jiri Olsa
2024-11-05 14:23 ` Peter Zijlstra
2024-11-05 16:33 ` Jiri Olsa
2024-11-14 23:44 ` Andrii Nakryiko
2024-11-16 21:44 ` Jiri Olsa
2024-11-19 6:06 ` Andrii Nakryiko
2024-11-19 9:13 ` Peter Zijlstra
2024-11-19 15:15 ` Jiri Olsa [this message]
2024-11-21 0:07 ` Andrii Nakryiko
2024-11-21 11:53 ` Peter Zijlstra
2024-11-21 16:02 ` Alexei Starovoitov
2024-11-21 16:34 ` Peter Zijlstra
2024-11-21 16:47 ` Alexei Starovoitov
2024-11-21 19:38 ` Mark Rutland
2024-11-14 23:44 ` Andrii Nakryiko
2024-11-16 21:44 ` Jiri Olsa
2024-11-19 6:05 ` Andrii Nakryiko
2024-11-19 15:14 ` Jiri Olsa
2024-11-21 0:10 ` Andrii Nakryiko
2024-11-05 13:34 ` [RFC perf/core 06/11] uprobes: Add uprobe syscall to speed up uprobe Jiri Olsa
2024-11-05 13:34 ` [RFC perf/core 07/11] uprobes/x86: Add support to optimize uprobes Jiri Olsa
2024-11-14 23:44 ` Andrii Nakryiko
2024-11-16 21:44 ` Jiri Olsa
2024-11-18 8:18 ` Masami Hiramatsu
2024-11-18 9:39 ` Jiri Olsa
2024-11-05 13:34 ` [RFC bpf-next 08/11] selftests/bpf: Use 5-byte nop for x86 usdt probes Jiri Olsa
2024-11-05 13:34 ` [RFC bpf-next 09/11] selftests/bpf: Add usdt trigger bench Jiri Olsa
2024-11-14 23:40 ` Andrii Nakryiko
2024-11-16 21:45 ` Jiri Olsa
2024-11-19 6:08 ` Andrii Nakryiko
2024-11-05 13:34 ` [RFC bpf-next 10/11] selftests/bpf: Add uprobe/usdt optimized test Jiri Olsa
2024-11-05 13:34 ` [RFC bpf-next 11/11] selftests/bpf: Add hit/attach/detach race optimized uprobe test Jiri Olsa
2024-11-17 11:49 ` [RFC 00/11] uprobes: Add support to optimize usdt probes on x86_64 Peter Zijlstra
2024-11-18 9:29 ` Jiri Olsa
2024-11-18 10:06 ` Mark Rutland
2024-11-19 6:13 ` Andrii Nakryiko
2024-11-21 18:18 ` Mark Rutland
2024-11-26 19:13 ` Andrii Nakryiko
2024-11-18 8:04 ` Masami Hiramatsu
2024-11-18 9:52 ` Jiri Olsa
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