From: Jiri Olsa <olsajiri@gmail.com>
To: Oleg Nesterov <oleg@redhat.com>
Cc: "Peter Zijlstra" <peterz@infradead.org>,
"Andrii Nakryiko" <andrii@kernel.org>,
bpf@vger.kernel.org, linux-kernel@vger.kernel.org,
linux-trace-kernel@vger.kernel.org, x86@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>,
"David Laight" <David.Laight@aculab.com>,
"Thomas Weißschuh" <thomas@t-8ch.de>,
"Ingo Molnar" <mingo@kernel.org>
Subject: Re: [PATCH perf/core 07/22] uprobes: Remove breakpoint in unapply_uprobe under mmap_write_lock
Date: Mon, 28 Apr 2025 13:11:12 +0200 [thread overview]
Message-ID: <aA9iUIsdiWfrFcRR@krava> (raw)
In-Reply-To: <20250427142400.GB9350@redhat.com>
On Sun, Apr 27, 2025 at 04:24:01PM +0200, Oleg Nesterov wrote:
> On 04/21, Jiri Olsa wrote:
> >
> > @@ -1483,7 +1483,7 @@ static int unapply_uprobe(struct uprobe *uprobe, struct mm_struct *mm)
> > struct vm_area_struct *vma;
> > int err = 0;
> >
> > - mmap_read_lock(mm);
> > + mmap_write_lock(mm);
>
> So uprobe_write_opcode() is always called under down_write(), right?
> Then this
>
> * Called with mm->mmap_lock held for read or write.
>
> comment should be probably updated.
yes
>
> And perhaps the comment above mmap_write_lock() in register_for_each_vma()
> should be updated too... or even removed.
hum, not sure now how it's related to this change, but will stare at it bit more
thanks,
jirka
next prev parent reply other threads:[~2025-04-28 11:11 UTC|newest]
Thread overview: 74+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-04-21 21:44 [PATCH perf/core 00/22] uprobes: Add support to optimize usdt probes on x86_64 Jiri Olsa
2025-04-21 21:44 ` [PATCH perf/core 01/22] uprobes: Rename arch_uretprobe_trampoline function Jiri Olsa
2025-04-21 21:44 ` [PATCH perf/core 02/22] uprobes: Make copy_from_page global Jiri Olsa
2025-04-21 21:44 ` [PATCH perf/core 03/22] uprobes: Move ref_ctr_offset update out of uprobe_write_opcode Jiri Olsa
2025-04-22 23:48 ` Andrii Nakryiko
2025-04-27 14:13 ` Oleg Nesterov
2025-04-28 10:51 ` Jiri Olsa
2025-04-29 13:44 ` Jiri Olsa
2025-05-06 13:11 ` Jiri Olsa
2025-05-06 14:01 ` Oleg Nesterov
2025-05-08 22:56 ` Jiri Olsa
2025-05-12 13:37 ` Oleg Nesterov
2025-04-21 21:44 ` [PATCH perf/core 04/22] uprobes: Add uprobe_write function Jiri Olsa
2025-04-21 21:44 ` [PATCH perf/core 05/22] uprobes: Add nbytes argument to uprobe_write Jiri Olsa
2025-04-22 23:48 ` Andrii Nakryiko
2025-04-21 21:44 ` [PATCH perf/core 06/22] uprobes: Add is_register argument to uprobe_write and uprobe_write_opcode Jiri Olsa
2025-04-22 23:48 ` Andrii Nakryiko
2025-04-21 21:44 ` [PATCH perf/core 07/22] uprobes: Remove breakpoint in unapply_uprobe under mmap_write_lock Jiri Olsa
2025-04-22 23:48 ` Andrii Nakryiko
2025-04-27 14:24 ` Oleg Nesterov
2025-04-28 11:11 ` Jiri Olsa [this message]
2025-04-28 11:40 ` Oleg Nesterov
2025-04-21 21:44 ` [PATCH perf/core 08/22] uprobes/x86: Add mapping for optimized uprobe trampolines Jiri Olsa
2025-04-22 23:51 ` Andrii Nakryiko
2025-04-27 14:56 ` Oleg Nesterov
2025-04-27 17:34 ` Oleg Nesterov
2025-04-28 13:48 ` Jiri Olsa
2025-04-27 18:04 ` Oleg Nesterov
2025-04-28 13:52 ` Jiri Olsa
2025-04-21 21:44 ` [PATCH perf/core 09/22] uprobes/x86: Add uprobe syscall to speed up uprobe Jiri Olsa
2025-04-22 23:48 ` Andrii Nakryiko
2025-04-27 15:51 ` Oleg Nesterov
2025-04-21 21:44 ` [PATCH perf/core 10/22] uprobes/x86: Add support to optimize uprobes Jiri Olsa
2025-04-23 0:04 ` Andrii Nakryiko
2025-04-24 12:49 ` Jiri Olsa
2025-04-24 16:06 ` Andrii Nakryiko
2025-04-27 17:11 ` Oleg Nesterov
2025-04-28 13:24 ` Jiri Olsa
2025-04-28 13:24 ` Jiri Olsa
2025-04-21 21:44 ` [PATCH perf/core 11/22] selftests/bpf: Use 5-byte nop for x86 usdt probes Jiri Olsa
2025-04-23 17:33 ` Andrii Nakryiko
2025-04-24 12:49 ` Jiri Olsa
2025-04-24 16:29 ` Andrii Nakryiko
2025-04-24 18:20 ` Andrii Nakryiko
2025-04-25 13:20 ` Jiri Olsa
2025-04-21 21:44 ` [PATCH perf/core 12/22] selftests/bpf: Reorg the uprobe_syscall test function Jiri Olsa
2025-04-23 17:34 ` Andrii Nakryiko
2025-04-21 21:44 ` [PATCH perf/core 13/22] selftests/bpf: Rename uprobe_syscall_executed prog to test_uretprobe_multi Jiri Olsa
2025-04-23 17:36 ` Andrii Nakryiko
2025-04-24 12:49 ` Jiri Olsa
2025-04-21 21:44 ` [PATCH perf/core 14/22] selftests/bpf: Add uprobe/usdt syscall tests Jiri Olsa
2025-04-23 17:40 ` Andrii Nakryiko
2025-04-24 12:49 ` Jiri Olsa
2025-04-21 21:44 ` [PATCH perf/core 15/22] selftests/bpf: Add hit/attach/detach race optimized uprobe test Jiri Olsa
2025-04-23 17:42 ` Andrii Nakryiko
2025-04-24 12:51 ` Jiri Olsa
2025-04-24 16:30 ` Andrii Nakryiko
2025-04-21 21:44 ` [PATCH perf/core 16/22] selftests/bpf: Add uprobe syscall sigill signal test Jiri Olsa
2025-04-21 21:44 ` [PATCH perf/core 17/22] selftests/bpf: Add optimized usdt variant for basic usdt test Jiri Olsa
2025-04-23 17:44 ` Andrii Nakryiko
2025-04-21 21:44 ` [PATCH perf/core 18/22] selftests/bpf: Add uprobe_regs_equal test Jiri Olsa
2025-04-23 17:46 ` Andrii Nakryiko
2025-04-24 12:51 ` Jiri Olsa
2025-04-21 21:44 ` [PATCH perf/core 19/22] selftests/bpf: Change test_uretprobe_regs_change for uprobe and uretprobe Jiri Olsa
2025-04-21 21:44 ` [PATCH perf/core 20/22] seccomp: passthrough uprobe systemcall without filtering Jiri Olsa
2025-04-21 23:04 ` Kees Cook
2025-04-21 21:44 ` [PATCH perf/core 21/22] selftests/seccomp: validate uprobe syscall passes through seccomp Jiri Olsa
2025-04-21 23:04 ` Kees Cook
2025-04-21 21:44 ` [PATCH 22/22] man2: Add uprobe syscall page Jiri Olsa
2025-04-22 7:00 ` Alejandro Colomar
2025-04-22 14:01 ` Jiri Olsa
2025-04-22 20:45 ` Alejandro Colomar
2025-05-01 21:26 ` Alejandro Colomar
2025-05-02 8:47 ` Jiri Olsa
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