linux-kernel - Re: [PATCH RFC 6/6] mm: madvise: don't split mTHP for MADV

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Message-ID: <3a3461fc-4b30-4ba1-94c9-c048d08d40c0@arm.com>
Date: Tue, 27 Feb 2024 14:40:17 +0000
From: Ryan Roberts <ryan.roberts@....com>
To: Barry Song <21cnbao@...il.com>, akpm@...ux-foundation.org,
 david@...hat.com, linux-mm@...ck.org
Cc: linux-kernel@...r.kernel.org, mhocko@...e.com, shy828301@...il.com,
 wangkefeng.wang@...wei.com, willy@...radead.org, xiang@...nel.org,
 ying.huang@...el.com, yuzhao@...gle.com, surenb@...gle.com,
 steven.price@....com, Chuanhua Han <hanchuanhua@...o.com>,
 Barry Song <v-songbaohua@...o.com>
Subject: Re: [PATCH RFC 6/6] mm: madvise: don't split mTHP for MADV_PAGEOUT

On 18/01/2024 11:10, Barry Song wrote:
> From: Chuanhua Han <hanchuanhua@...o.com>
> 
> MADV_PAGEOUT and MADV_FREE are common cases in Android. Ryan's patchset has
> supported swapping large folios out as a whole for vmscan case. This patch
> extends the feature to madvise.
> 
> If madvised range covers the whole large folio, we don't split it. Otherwise,
> we still need to split it.
> 
> This patch doesn't depend on ARM64's CONT-PTE, alternatively, it defines one
> helper named pte_range_cont_mapped() to check if all PTEs are contiguously
> mapped to a large folio.

I'm going to rework this patch and integrate it into my series if that's ok with
you?