linux-kernel - Re: [PATCH v2] filemap: add trace events for get_pages, map

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Message-ID: <CAH9xa6ej2g+DvCd=cqjj8sx9yZ=DjL6Ffu6aOfebvcjBmGs5pQ@mail.gmail.com>
Date: Tue, 2 Jul 2024 19:27:16 +0900
From: Takaya Saeki <takayas@...omium.org>
To: Steven Rostedt <rostedt@...dmis.org>
Cc: "Masami Hiramatsu (Google)" <mhiramat@...nel.org>, Matthew Wilcox <willy@...radead.org>, 
	Andrew Morton <akpm@...ux-foundation.org>, 
	Mathieu Desnoyers <mathieu.desnoyers@...icios.com>, Junichi Uekawa <uekawa@...omium.org>, 
	linux-kernel@...r.kernel.org, linux-trace-kernel@...r.kernel.org, 
	linux-fsdevel@...r.kernel.org, linux-mm@...ck.org
Subject: Re: [PATCH v2] filemap: add trace events for get_pages, map_pages,
 and fault

Hello all, and thank you so much for the review, Steven and Masami.

I'm currently considering replacing the `max_ofs` output with
`length`. Please let me know your thoughts.
With the current design, a memory range of an event is an inclusive
range of [ofs, max_ofs + 4096]. I found the `+4096` part confusing
during the ureadahead's upstreaming work. Replacing `max_ofs` with
`length` makes the range specified by an event much more concise.