linux-kernel - Re: [RESEND PATCH] mm: align larger anonymous mappings on THP boundaries

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Message-ID: <2c14d9ad-c5a3-4f29-a6eb-633cdf3a5e9e@redhat.com>
Date: Tue, 7 May 2024 13:13:17 +0200
From: David Hildenbrand <david@...hat.com>
To: Kefeng Wang <wangkefeng.wang@...wei.com>,
 Ryan Roberts <ryan.roberts@....com>, Yang Shi <shy828301@...il.com>
Cc: Matthew Wilcox <willy@...radead.org>,
 Yang Shi <yang@...amperecomputing.com>, riel@...riel.com, cl@...ux.com,
 akpm@...ux-foundation.org, linux-kernel@...r.kernel.org, linux-mm@...ck.org,
 Ze Zuo <zuoze1@...wei.com>
Subject: Re: [RESEND PATCH] mm: align larger anonymous mappings on THP
 boundaries


> https://github.com/intel/lmbench/blob/master/src/lat_mem_rd.c#L95
> 
>> suggest. If you want to try something semi-randomly; it might be useful to rule
>> out the arm64 contpte feature. I don't see how that would be interacting here if
>> mTHP is disabled (is it?). But its new for 6.9 and arm64 only. Disable with
>> ARM64_CONTPTE (needs EXPERT) at compile time.
> I don't enabled mTHP, so it should be not related about ARM64_CONTPTE,
> but will have a try.

cont-pte can get active if we're just lucky when allocating pages in the 
right order, correct Ryan?

-- 
Cheers,

David / dhildenb