From: Steven Rostedt <rostedt@goodmis.org>
To: Vincent Donnefort <vdonnefort@google.com>
Cc: mhiramat@kernel.org, linux-trace-kernel@vger.kernel.org,
mathieu.desnoyers@efficios.com, kernel-team@android.com,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH v5 07/10] ring-buffer: Dynamically calculate max_data_size
Date: Thu, 13 Aug 2026 21:34:07 -0400 [thread overview]
Message-ID: <20260813213407.6bc29cc9@gandalf.local.home> (raw)
In-Reply-To: <20260813131152.3589632-8-vdonnefort@google.com>
On Thu, 13 Aug 2026 14:11:49 +0100
Vincent Donnefort <vdonnefort@google.com> wrote:
> The ring buffer order can be dynamically modified and temporarily
> disables writing to do so. It is therefore safe to use the updated value
> to calculate the maximum event size which can be written onto the ring
> buffer.
>
> However, notice it is hardly making any difference for trace_marker
> because of the TRACE_MARKER_MAX_SIZE limit. For an 8KiB subbuf size,
> trace_marker can take 4096 characters while it can 'only' take 4054
> bytes for smaller subbufs.
>
> Fixes: f9b94daa542a ("ring-buffer: Set new size of the ring buffer sub page")
Why the fixes tag? What is it fixing?
-- Steve
> Signed-off-by: Vincent Donnefort <vdonnefort@google.com>
next prev parent reply other threads:[~2026-08-14 1:34 UTC|newest]
Thread overview: 29+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-08-13 13:11 [PATCH v5 00/10] ring-buffer: Fixes for subbuf resizing and persistent buffers Vincent Donnefort
2026-08-13 13:11 ` [PATCH v5 01/10] ring-buffer: Free cpu_buffer::free_page with subbuf_order Vincent Donnefort
2026-08-13 13:54 ` sashiko-bot
2026-08-13 15:49 ` Masami Hiramatsu
2026-08-13 16:02 ` Vincent Donnefort
2026-08-13 16:03 ` Vincent Donnefort
2026-08-13 16:18 ` Masami Hiramatsu
2026-08-13 13:11 ` [PATCH v5 02/10] ring-buffer: Hold cpu_buffer::lock when resizing a subbuf Vincent Donnefort
2026-08-13 14:01 ` sashiko-bot
2026-08-13 13:11 ` [PATCH v5 03/10] ring-buffer: Make cpu_buffer::free_page a buffer_data_read_page Vincent Donnefort
2026-08-13 13:56 ` sashiko-bot
2026-08-14 1:04 ` Steven Rostedt
2026-08-13 13:11 ` [PATCH v5 04/10] ring-buffer: Fix subbuf resize race with ring buffer readers Vincent Donnefort
2026-08-13 13:51 ` sashiko-bot
2026-08-14 1:12 ` Steven Rostedt
2026-08-13 13:11 ` [PATCH v5 05/10] ring-buffer: Fix subbuf resize race with ring_buffer_alloc_read_page() Vincent Donnefort
2026-08-13 13:11 ` [PATCH v5 06/10] tracing: Fix subbuf resize races with trace_pipe_raw readers Vincent Donnefort
2026-08-13 13:53 ` sashiko-bot
2026-08-14 1:31 ` Steven Rostedt
2026-08-14 8:02 ` Vincent Donnefort
2026-08-13 13:11 ` [PATCH v5 07/10] ring-buffer: Dynamically calculate max_data_size Vincent Donnefort
2026-08-14 1:34 ` Steven Rostedt [this message]
2026-08-14 7:59 ` Vincent Donnefort
2026-08-13 13:11 ` [PATCH v5 08/10] ring-buffer: Remove trace_buffer::cpus Vincent Donnefort
2026-08-13 13:11 ` [PATCH v5 09/10] ring-buffer: Remove ring_buffer_per_cpu::mapped Vincent Donnefort
2026-08-13 13:11 ` [PATCH v5 10/10] ring-buffer: Make nr_pages unsigned int Vincent Donnefort
2026-08-13 13:55 ` sashiko-bot
2026-08-14 1:41 ` Steven Rostedt
2026-08-14 8:07 ` Vincent Donnefort
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