linux-kernel - Re: [linus:master] [mm] c0bff412e6: stress-ng.clone.ops_per

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Message-ID: <c56fefdd-ffe4-4eee-ab0d-8a495daf3d5d@redhat.com>
Date: Thu, 1 Aug 2024 09:54:19 +0200
From: David Hildenbrand <david@...hat.com>
To: "Yin, Fengwei" <fengwei.yin@...el.com>,
 kernel test robot <oliver.sang@...el.com>, Peter Xu <peterx@...hat.com>
Cc: oe-lkp@...ts.linux.dev, lkp@...el.com, linux-kernel@...r.kernel.org,
 Andrew Morton <akpm@...ux-foundation.org>,
 Huacai Chen <chenhuacai@...nel.org>, Jason Gunthorpe <jgg@...dia.com>,
 Matthew Wilcox <willy@...radead.org>, Nathan Chancellor <nathan@...nel.org>,
 Ryan Roberts <ryan.roberts@....com>, WANG Xuerui <kernel@...0n.name>,
 linux-mm@...ck.org, ying.huang@...el.com, feng.tang@...el.com
Subject: Re: [linus:master] [mm] c0bff412e6: stress-ng.clone.ops_per_sec -2.9%
 regression

On 01.08.24 09:44, Yin, Fengwei wrote:
> Hi David,
> 
> On 8/1/2024 2:49 PM, David Hildenbrand wrote:
>> We now have to do a page_folio(page) and then test for hugetlb.
>>
>>       return folio_test_hugetlb(page_folio(page));
>>
>> Nowadays, folio_test_hugetlb() will be faster than at c0bff412e6 times,
>> so maybe at least part of the overhead is gone.
> This is great. We will check the trend to know whether it's recovered
> in some level.

Oh, I think d99e3140a4d33e26066183ff727d8f02f56bec64 went upstream 
before c0bff412e67b781d761e330ff9578aa9ed2be79e, so at the time of 
c0bff412e6 we already should have had the faster check!

-- 
Cheers,

David / dhildenb