From: Oleg Nesterov <oleg@redhat.com>
To: Sebastian Sewior <bigeasy@linutronix.de>
Cc: Alexei Starovoitov <alexei.starovoitov@gmail.com>,
Peter Ziljstra <peterz@infradead.org>,
Andrii Nakryiko <andrii@kernel.org>, bpf <bpf@vger.kernel.org>,
Steven Rostedt <rostedt@goodmis.org>,
Jiri Olsa <jolsa@kernel.org>,
Masami Hiramatsu <mhiramat@kernel.org>
Subject: Re: uprobe splat in PREEMP_RT
Date: Wed, 2 Apr 2025 14:12:28 +0200 [thread overview]
Message-ID: <20250402121228.GH22091@redhat.com> (raw)
In-Reply-To: <20250402120649._gQHEtYM@linutronix.de>
On 04/02, Sebastian Sewior wrote:
>
> On 2025-04-02 13:31:43 [+0200], Oleg Nesterov wrote:
> >
> > IOW.
> >
> > I understand that seqcount_t is not RT-friendly, but why exactly do
> > you think the patch above can make the things worse?
>
> We wouldn't notice such a case.
Sebastian, could you spell please?
What case we wouldn't notice?
With this patch write_seqcount_begin(seqcount_t) will notice that
seqprop_preemptible() is true and do preempt_disable() itself.
Oleg.
next prev parent reply other threads:[~2025-04-02 12:13 UTC|newest]
Thread overview: 28+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-04-01 21:04 uprobe splat in PREEMP_RT Alexei Starovoitov
2025-04-01 21:22 ` Steven Rostedt
2025-04-01 22:01 ` Andrii Nakryiko
2025-04-02 10:33 ` Oleg Nesterov
2025-04-02 10:57 ` Sebastian Sewior
2025-04-02 11:23 ` Oleg Nesterov
2025-04-02 12:13 ` Sebastian Sewior
2025-04-02 12:18 ` Oleg Nesterov
2025-04-02 12:24 ` Sebastian Sewior
2025-04-02 14:12 ` Oleg Nesterov
2025-04-03 7:37 ` Sebastian Sewior
2025-04-03 12:27 ` Oleg Nesterov
2025-04-03 16:04 ` Andrii Nakryiko
2025-04-02 16:15 ` Andrii Nakryiko
2025-04-02 16:57 ` Oleg Nesterov
2025-04-02 12:21 ` Sebastian Sewior
2025-04-02 9:10 ` Oleg Nesterov
2025-04-02 10:54 ` Sebastian Sewior
2025-04-02 11:20 ` Oleg Nesterov
2025-04-02 11:31 ` Oleg Nesterov
2025-04-02 12:06 ` Sebastian Sewior
2025-04-02 12:12 ` Oleg Nesterov [this message]
2025-04-02 12:16 ` Sebastian Sewior
2025-04-02 13:56 ` Oleg Nesterov
2025-04-02 14:23 ` Oleg Nesterov
2025-04-03 9:08 ` Sebastian Sewior
2025-04-03 12:11 ` Oleg Nesterov
2025-04-03 12:43 ` Oleg Nesterov
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