From: Jiri Olsa <jolsa@kernel.org>
To: Steven Rostedt <rostedt@goodmis.org>,
Masami Hiramatsu <mhiramat@kernel.org>,
Oleg Nesterov <oleg@redhat.com>,
Alexei Starovoitov <ast@kernel.org>,
Daniel Borkmann <daniel@iogearbox.net>,
Andrii Nakryiko <andrii@kernel.org>
Cc: linux-kernel@vger.kernel.org, linux-trace-kernel@vger.kernel.org,
linux-api@vger.kernel.org, linux-man@vger.kernel.org,
x86@kernel.org, bpf@vger.kernel.org,
Song Liu <songliubraving@fb.com>, Yonghong Song <yhs@fb.com>,
John Fastabend <john.fastabend@gmail.com>,
Peter Zijlstra <peterz@infradead.org>,
Thomas Gleixner <tglx@linutronix.de>,
"Borislav Petkov (AMD)" <bp@alien8.de>,
Ingo Molnar <mingo@redhat.com>, Andy Lutomirski <luto@kernel.org>
Subject: [PATCHv4 bpf-next 0/7] uprobe: uretprobe speed up
Date: Thu, 2 May 2024 14:23:06 +0200 [thread overview]
Message-ID: <20240502122313.1579719-1-jolsa@kernel.org> (raw)
hi,
as part of the effort on speeding up the uprobes [0] coming with
return uprobe optimization by using syscall instead of the trap
on the uretprobe trampoline.
The speed up depends on instruction type that uprobe is installed
and depends on specific HW type, please check patch 1 for details.
Patches 1-6 are based on bpf-next/master, but path 1 and 2 are
apply-able on linux-trace.git tree probes/for-next branch.
Patch 7 is based on man-pages master.
v4 changes:
- added acks [Oleg,Andrii,Masami]
- reworded the man page and adding more info to NOTE section [Masami]
- rewrote bpf tests not to use trace_pipe [Andrii]
- cc-ed linux-man list
Also available at:
https://git.kernel.org/pub/scm/linux/kernel/git/jolsa/perf.git
uretprobe_syscall
thanks,
jirka
Notes to check list items in Documentation/process/adding-syscalls.rst:
- System Call Alternatives
New syscall seems like the best way in here, becase we need
just to quickly enter kernel with no extra arguments processing,
which we'd need to do if we decided to use another syscall.
- Designing the API: Planning for Extension
The uretprobe syscall is very specific and most likely won't be
extended in the future.
At the moment it does not take any arguments and even if it does
in future, it's allowed to be called only from trampoline prepared
by kernel, so there'll be no broken user.
- Designing the API: Other Considerations
N/A because uretprobe syscall does not return reference to kernel
object.
- Proposing the API
Wiring up of the uretprobe system call si in separate change,
selftests and man page changes are part of the patchset.
- Generic System Call Implementation
There's no CONFIG option for the new functionality because it
keeps the same behaviour from the user POV.
- x86 System Call Implementation
It's 64-bit syscall only.
- Compatibility System Calls (Generic)
N/A uretprobe syscall has no arguments and is not supported
for compat processes.
- Compatibility System Calls (x86)
N/A uretprobe syscall is not supported for compat processes.
- System Calls Returning Elsewhere
N/A.
- Other Details
N/A.
- Testing
Adding new bpf selftests and ran ltp on top of this change.
- Man Page
Attached.
- Do not call System Calls in the Kernel
N/A.
[0] https://lore.kernel.org/bpf/ZeCXHKJ--iYYbmLj@krava/
---
Jiri Olsa (6):
uprobe: Wire up uretprobe system call
uprobe: Add uretprobe syscall to speed up return probe
selftests/bpf: Add uretprobe syscall test for regs integrity
selftests/bpf: Add uretprobe syscall test for regs changes
selftests/bpf: Add uretprobe syscall call from user space test
selftests/bpf: Add uretprobe compat test
arch/x86/entry/syscalls/syscall_64.tbl | 1 +
arch/x86/kernel/uprobes.c | 115 ++++++++++++++++++++++++++++
include/linux/syscalls.h | 2 +
include/linux/uprobes.h | 3 +
include/uapi/asm-generic/unistd.h | 5 +-
kernel/events/uprobes.c | 24 ++++--
kernel/sys_ni.c | 2 +
tools/include/linux/compiler.h | 4 +
tools/testing/selftests/bpf/.gitignore | 1 +
tools/testing/selftests/bpf/Makefile | 7 +-
tools/testing/selftests/bpf/bpf_testmod/bpf_testmod.c | 123 ++++++++++++++++++++++++++++-
tools/testing/selftests/bpf/prog_tests/uprobe_syscall.c | 382 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
tools/testing/selftests/bpf/progs/uprobe_syscall.c | 15 ++++
tools/testing/selftests/bpf/progs/uprobe_syscall_executed.c | 17 +++++
14 files changed, 691 insertions(+), 10 deletions(-)
create mode 100644 tools/testing/selftests/bpf/prog_tests/uprobe_syscall.c
create mode 100644 tools/testing/selftests/bpf/progs/uprobe_syscall.c
create mode 100644 tools/testing/selftests/bpf/progs/uprobe_syscall_executed.c
Jiri Olsa (1):
man2: Add uretprobe syscall page
man2/uretprobe.2 | 45 +++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 45 insertions(+)
create mode 100644 man2/uretprobe.2
next reply other threads:[~2024-05-02 12:23 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-05-02 12:23 Jiri Olsa [this message]
2024-05-02 12:23 ` [PATCHv4 bpf-next 1/7] uprobe: Wire up uretprobe system call Jiri Olsa
2024-05-02 12:23 ` [PATCHv4 bpf-next 2/7] uprobe: Add uretprobe syscall to speed up return probe Jiri Olsa
2024-05-03 11:34 ` Peter Zijlstra
2024-05-03 13:04 ` Jiri Olsa
2024-05-03 15:53 ` Edgecombe, Rick P
2024-05-03 19:18 ` Jiri Olsa
2024-05-03 19:38 ` Edgecombe, Rick P
2024-05-03 20:17 ` Jiri Olsa
2024-05-03 20:35 ` Edgecombe, Rick P
2024-05-06 10:56 ` Jiri Olsa
2024-05-03 23:01 ` Deepak Gupta
2024-05-02 12:23 ` [PATCHv4 bpf-next 3/7] selftests/bpf: Add uretprobe syscall test for regs integrity Jiri Olsa
2024-05-02 12:23 ` [PATCHv4 bpf-next 4/7] selftests/bpf: Add uretprobe syscall test for regs changes Jiri Olsa
2024-05-02 12:23 ` [PATCHv4 bpf-next 5/7] selftests/bpf: Add uretprobe syscall call from user space test Jiri Olsa
2024-05-02 16:33 ` Andrii Nakryiko
2024-05-02 12:23 ` [PATCHv4 bpf-next 6/7] selftests/bpf: Add uretprobe compat test Jiri Olsa
2024-05-02 16:35 ` Andrii Nakryiko
2024-05-02 12:23 ` [PATCHv4 7/7] man2: Add uretprobe syscall page Jiri Olsa
2024-05-02 13:43 ` Alejandro Colomar
2024-05-02 20:13 ` Jiri Olsa
2024-05-02 22:06 ` Alejandro Colomar
2024-05-02 16:43 ` [PATCHv4 bpf-next 0/7] uprobe: uretprobe speed up Andrii Nakryiko
2024-05-02 20:04 ` Jiri Olsa
2024-05-03 18:03 ` Andrii Nakryiko
2024-05-03 20:39 ` Jiri Olsa
2024-05-07 7:47 ` Jiri Olsa
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