From: Steven Rostedt <rostedt@goodmis.org>
To: "Masami Hiramatsu (Google)" <mhiramat@kernel.org>
Cc: linux-kernel@vger.kernel.org, linux-trace-kernel@vger.kernel.org,
Mark Rutland <mark.rutland@arm.com>,
Mathieu Desnoyers <mathieu.desnoyers@efficios.com>,
Andrew Morton <akpm@linux-foundation.org>,
Tzvetomir Stoyanov <tz.stoyanov@gmail.com>,
Vincent Donnefort <vdonnefort@google.com>,
Kent Overstreet <kent.overstreet@gmail.com>
Subject: Re: [PATCH v5 15/15] tracing: Update subbuffer with kilobytes not page order
Date: Wed, 20 Dec 2023 20:57:05 -0500 [thread overview]
Message-ID: <20231220205705.64de0424@gandalf.local.home> (raw)
In-Reply-To: <20231221092621.c3d4ecc23b852d3c4183370d@kernel.org>
On Thu, 21 Dec 2023 09:26:21 +0900
Masami Hiramatsu (Google) <mhiramat@kernel.org> wrote:
> > If the user specifies 3 via:
> >
> > echo 3 > buffer_subbuf_size_kb
> >
> > Then the sub-buffer size will round up to 4kb (on a 4kb page size system).
> >
> > If they specify:
> >
> > echo 6 > buffer_subbuf_size_kb
> >
> > The sub-buffer size will become 8kb.
>
> I think this is better interface. Can we apply this earlier in the series
> to avoid rewriting the document and test code?
I kept it separate for testing purposes.
Through out all this, it was a good way to make sure the two approaches
were compatible. I still like to keep them separate as that's the way it
was developed. It's good to keep that history.
-- Steve
next prev parent reply other threads:[~2023-12-21 1:56 UTC|newest]
Thread overview: 36+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-12-19 18:54 [PATCH v5 00/15] ring-buffer/tracing: Allow ring buffer to have bigger sub buffers Steven Rostedt
2023-12-19 18:54 ` [PATCH v5 01/15] ring-buffer: Refactor ring buffer implementation Steven Rostedt
2023-12-20 9:48 ` Masami Hiramatsu
2023-12-20 12:53 ` Steven Rostedt
2023-12-19 18:54 ` [PATCH v5 02/15] ring-buffer: Page size per ring buffer Steven Rostedt
2023-12-20 8:48 ` David Laight
2023-12-20 13:01 ` Steven Rostedt
2023-12-21 9:17 ` David Laight
2023-12-21 14:19 ` Steven Rostedt
2023-12-21 14:51 ` David Laight
2023-12-21 14:57 ` Steven Rostedt
2023-12-19 18:54 ` [PATCH v5 03/15] ring-buffer: Add interface for configuring trace sub buffer size Steven Rostedt
2023-12-20 14:26 ` Masami Hiramatsu
2023-12-20 14:40 ` Steven Rostedt
2023-12-21 0:10 ` Masami Hiramatsu
2023-12-19 18:54 ` [PATCH v5 04/15] ring-buffer: Set new size of the ring buffer sub page Steven Rostedt
2023-12-20 16:34 ` Masami Hiramatsu
2023-12-20 16:56 ` Steven Rostedt
2023-12-21 0:11 ` Masami Hiramatsu
2023-12-19 18:54 ` [PATCH v5 05/15] ring-buffer: Read and write to ring buffers with custom sub buffer size Steven Rostedt
2023-12-19 18:54 ` [PATCH v5 06/15] ring-buffer: Clear pages on error in ring_buffer_subbuf_order_set() failure Steven Rostedt
2023-12-20 16:23 ` Masami Hiramatsu
2023-12-20 16:30 ` Steven Rostedt
2023-12-19 18:54 ` [PATCH v5 07/15] ring-buffer: Do no swap cpu buffers if order is different Steven Rostedt
2023-12-19 18:54 ` [PATCH v5 08/15] ring-buffer: Make sure the spare sub buffer used for reads has same size Steven Rostedt
2023-12-19 18:54 ` [PATCH v5 09/15] tracing: Update snapshot order along with main buffer order Steven Rostedt
2023-12-19 18:54 ` [PATCH v5 10/15] tracing: Stop the tracing while changing the ring buffer subbuf size Steven Rostedt
2023-12-19 18:54 ` [PATCH v5 11/15] ring-buffer: Keep the same size when updating the order Steven Rostedt
2023-12-19 18:54 ` [PATCH v5 12/15] ring-buffer: Just update the subbuffers when changing their allocation order Steven Rostedt
2023-12-19 18:54 ` [PATCH v5 13/15] ring-buffer: Add documentation on the buffer_subbuf_order file Steven Rostedt
2023-12-19 18:54 ` [PATCH v5 14/15] ringbuffer/selftest: Add basic selftest to test changing subbuf order Steven Rostedt
2023-12-21 0:23 ` Masami Hiramatsu
2023-12-19 18:54 ` [PATCH v5 15/15] tracing: Update subbuffer with kilobytes not page order Steven Rostedt
2023-12-21 0:26 ` Masami Hiramatsu
2023-12-21 1:57 ` Steven Rostedt [this message]
2023-12-19 22:38 ` [PATCH v5 16/15] ring-buffer: Use subbuf_order for buffer page masking Steven Rostedt
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