linux-kernel - Re: [PATCH v3 2/2] mm: add docs for per-order mTHP split counters

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Message-ID: <20240705110816.75871-1-ioworker0@gmail.com>
Date: Fri,  5 Jul 2024 19:08:16 +0800
From: Lance Yang <ioworker0@...il.com>
To: david@...hat.com
Cc: 21cnbao@...il.com,
	akpm@...ux-foundation.org,
	baohua@...nel.org,
	baolin.wang@...ux.alibaba.com,
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	ryan.roberts@....com,
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Subject: Re: [PATCH v3 2/2] mm: add docs for per-order mTHP split counters

Hi David and Ryan,

Thanks for taking time to review!

Updated the doc. How about the following?

split
	is incremented every time a huge page is successfully split into
	smaller orders. This can happen for a variety of reasons but a
	common reason is that a huge page is old and is being reclaimed.

split_failed
	is incremented if kernel fails to split huge
	page. This can happen if the page was pinned by somebody.

split_deferred
	is incremented when a huge page is put onto split queue.
	This happens when a huge page is partially unmapped and splitting
	it would free up some memory. Pages on split queue are going to
	be split under memory pressure, if splitting is possible.

Thanks,
Lance