From: Matthew Wilcox <willy@infradead.org>
To: Peter Zijlstra <peterz@infradead.org>
Cc: "Paul E. McKenney" <paulmck@kernel.org>,
Andrii Nakryiko <andrii.nakryiko@gmail.com>,
Masami Hiramatsu <mhiramat@kernel.org>,
mingo@kernel.org, andrii@kernel.org,
linux-kernel@vger.kernel.org, rostedt@goodmis.org,
oleg@redhat.com, jolsa@kernel.org, clm@meta.com,
bpf <bpf@vger.kernel.org>
Subject: Re: [PATCH 00/10] perf/uprobe: Optimize uprobes
Date: Tue, 9 Jul 2024 17:30:38 +0100 [thread overview]
Message-ID: <Zo1lrpO3suceheVj@casper.infradead.org> (raw)
In-Reply-To: <Zo1hBFS7c_J-Yx-7@casper.infradead.org>
On Tue, Jul 09, 2024 at 05:10:45PM +0100, Matthew Wilcox wrote:
> > So I fundamentally do not believe in per-VMA locking. Specifically for
> > this case that would be trading one hot line for another. I tried
> > telling people that, but it doesn't seem to stick :/
>
> SRCU also had its own performance problems, so we've got problems one
> way or the other. The per-VMA lock probably doesn't work quite the way
> you think it does, but it absoutely can be a hot cacheline.
>
> I did propose a store-free variant at LSFMM 2022 and again at 2023,
> but was voted down. https://lwn.net/Articles/932298/
Actually, the 2022 version has a bit more of the flavour of the
argument: https://lwn.net/Articles/893906/
next prev parent reply other threads:[~2024-07-09 16:30 UTC|newest]
Thread overview: 52+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20240708091241.544262971@infradead.org>
[not found] ` <20240709075651.122204f1358f9f78d1e64b62@kernel.org>
2024-07-09 0:25 ` [PATCH 00/10] perf/uprobe: Optimize uprobes Andrii Nakryiko
2024-07-09 9:01 ` Peter Zijlstra
2024-07-09 14:11 ` Paul E. McKenney
2024-07-09 14:29 ` Peter Zijlstra
2024-07-09 14:36 ` Paul E. McKenney
2024-07-09 15:31 ` Peter Zijlstra
2024-07-09 15:56 ` Paul E. McKenney
2024-07-09 16:10 ` Matthew Wilcox
2024-07-09 16:30 ` Matthew Wilcox [this message]
2024-07-09 16:57 ` Paul E. McKenney
2024-07-10 9:16 ` Peter Zijlstra
2024-07-10 9:40 ` Peter Zijlstra
2024-07-22 19:09 ` Suren Baghdasaryan
2024-07-27 0:20 ` Andrii Nakryiko
2024-07-27 1:29 ` Suren Baghdasaryan
2024-07-27 3:45 ` Matthew Wilcox
2024-07-30 3:18 ` Andrii Nakryiko
2024-07-30 13:10 ` Peter Zijlstra
2024-07-30 18:10 ` Suren Baghdasaryan
2024-08-03 5:47 ` Andrii Nakryiko
2024-08-03 8:53 ` Peter Zijlstra
2024-08-04 23:22 ` Andrii Nakryiko
2024-08-06 4:08 ` Andrii Nakryiko
2024-08-06 14:50 ` Suren Baghdasaryan
2024-08-06 17:40 ` Andrii Nakryiko
2024-08-06 17:44 ` Suren Baghdasaryan
2024-08-07 1:36 ` Suren Baghdasaryan
2024-08-07 5:13 ` Suren Baghdasaryan
2024-08-07 17:49 ` Andrii Nakryiko
2024-08-07 18:04 ` Suren Baghdasaryan
2024-08-07 18:30 ` Andrii Nakryiko
2024-08-07 18:33 ` Suren Baghdasaryan
2024-08-08 0:47 ` Andrii Nakryiko
2024-07-30 13:46 ` Peter Zijlstra
2024-07-30 18:16 ` Suren Baghdasaryan
2024-07-09 16:42 ` Andrii Nakryiko
2024-07-09 9:03 ` Peter Zijlstra
2024-07-09 10:01 ` Jiri Olsa
2024-07-09 10:16 ` Peter Zijlstra
2024-07-09 22:10 ` Masami Hiramatsu
2024-07-10 10:10 ` Peter Zijlstra
2024-07-10 14:56 ` Masami Hiramatsu
2024-07-10 18:40 ` Andrii Nakryiko
2024-07-11 8:51 ` Peter Zijlstra
2024-07-11 15:17 ` Masami Hiramatsu
2024-07-11 15:22 ` Peter Zijlstra
2024-07-11 17:47 ` Steven Rostedt
2024-07-11 23:59 ` Masami Hiramatsu
2024-07-10 0:55 ` Masami Hiramatsu
2024-07-09 21:47 ` Andrii Nakryiko
2024-07-10 10:12 ` Peter Zijlstra
2024-07-10 12:34 ` Peter Zijlstra
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