linux-kernel - Re: [PATCH 0/2] mm: introduce per-order mTHP split counters

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Date: Wed, 24 Apr 2024 17:00:01 +0200
From: David Hildenbrand <david@...hat.com>
To: Lance Yang <ioworker0@...il.com>, akpm@...ux-foundation.org
Cc: 21cnbao@...il.com, ryan.roberts@....com, baolin.wang@...ux.alibaba.com,
 linux-kernel@...r.kernel.org, linux-mm@...ck.org
Subject: Re: [PATCH 0/2] mm: introduce per-order mTHP split counters

On 24.04.24 15:51, Lance Yang wrote:
> Hi all,
> 
> At present, the split counters in THP statistics no longer include
> PTE-mapped mTHP. Therefore, we want to introduce per-order mTHP split
> counters to monitor the frequency of mTHP splits. This will assist
> developers in better analyzing and optimizing system performance.
> 
> /sys/kernel/mm/transparent_hugepage/hugepages-<size>/stats
>          split_page
>          split_page_failed
>          deferred_split_page
> 
> Thanks,
> Lance
> ---
> 
> Lance Yang (2):
>   mm: add per-order mTHP split counters
>   mm: add docs for per-order mTHP split counters
> 
>   Documentation/admin-guide/mm/transhuge.rst | 16 ----------------

We really have to start documenting these, and what the sementics are.

E.g., is split_page_failed contained in split_page? Is 
deferred_split_page contained in split_page?

But also: just don't call it "split_page". Drop the "_page".

split
split_failed
split_deferred

?

-- 
Cheers,

David / dhildenb