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

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Date: Fri, 21 Jun 2024 01:18:08 +0900
From: Takaya Saeki <takayas@...omium.org>
To: Matthew Wilcox <willy@...radead.org>
Cc: Andrew Morton <akpm@...ux-foundation.org>, Steven Rostedt <rostedt@...dmis.org>, 
	Masami Hiramatsu <mhiramat@...nel.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] filemap: add trace events for get_pages, map_pages, and fault

Thank you Matthew for taking a look at this!
I fix both points and send a V2 patch.

> This needs to be cast to an loff_t before shifting.

I found that this applies to add_to_page_cache and delete_from_page_cache, too.
I could fix them too, but I didn't since it will change the max value
of those traces from %lu to %lld on 32 bit environments, which would
be a breaking change. However, let me know if you think we should fix
existing events as well.