linux-kernel - Re: [PATCH] mm: add per-order mTHP swap-in fallback counters

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Message-ID: <2c641b7a-4114-4cc1-b87b-052e973b33bb@gmail.com>
Date: Fri, 22 Nov 2024 10:25:07 +0800
From: Wenchao Hao <haowenchao22@...il.com>
To: Barry Song <21cnbao@...il.com>
Cc: Jonathan Corbet <corbet@....net>,
 Andrew Morton <akpm@...ux-foundation.org>,
 David Hildenbrand <david@...hat.com>, Ryan Roberts <ryan.roberts@....com>,
 Baolin Wang <baolin.wang@...ux.alibaba.com>,
 Usama Arif <usamaarif642@...il.com>, Lance Yang <ioworker0@...il.com>,
 Matthew Wilcox <willy@...radead.org>, Peter Xu <peterx@...hat.com>,
 linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org, linux-mm@...ck.org
Subject: Re: [PATCH] mm: add per-order mTHP swap-in fallback counters

On 2024/11/22 06:32, Barry Song wrote:
> On Fri, Nov 22, 2024 at 5:28 AM Wenchao Hao <haowenchao22@...il.com> wrote:
>>
>> Now large folio swap-in is supported, but we do not have a method
>> to analyze the success ratio of large folio swap-ins. Similar to
>> anon_fault_fallback, we add a per-order mTHP swpin_fallback to help
>> calculate the success ratio. The new counter is located at:
>>
>> /sys/kernel/mm/transparent_hugepage/hugepages-<size>/stats/swpin_fallback
> 
> Well,  this could be useful for profiling, but why not also add
> MTHP_STAT_SWPIN_FALLBACK_CHARGE ?
> 

Hi, since my current testing scenario does not involve
MTHP_STAT_SWPIN_FALLBACK_CHARGE, I will soon resend a V2 version
to add it.

Thanks.