linux-kernel - Re: [PATCH v3 0/3] Enable >0 order folio memory compaction

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Date: Mon, 05 Feb 2024 09:18:20 -0500
From: Zi Yan <ziy@...dia.com>
To: Baolin Wang <baolin.wang@...ux.alibaba.com>
Cc: linux-mm@...ck.org, linux-kernel@...r.kernel.org,
 "\"Huang, Ying\"" <ying.huang@...el.com>,
 Ryan Roberts <ryan.roberts@....com>,
 Andrew Morton <akpm@...ux-foundation.org>,
 "\"Matthew Wilcox (Oracle)\"" <willy@...radead.org>,
 David Hildenbrand <david@...hat.com>,
 "\"Yin, Fengwei\"" <fengwei.yin@...el.com>, Yu Zhao <yuzhao@...gle.com>,
 Vlastimil Babka <vbabka@...e.cz>,
 "\"Kirill A . Shutemov\"" <kirill.shutemov@...ux.intel.com>,
 Johannes Weiner <hannes@...xchg.org>, Kemeng Shi <shikemeng@...weicloud.com>,
 Mel Gorman <mgorman@...hsingularity.net>,
 Rohan Puri <rohan.puri15@...il.com>, Mcgrof Chamberlain <mcgrof@...nel.org>,
 Adam Manzanares <a.manzanares@...sung.com>,
 "\"Vishal Moola (Oracle)\"" <vishal.moola@...il.com>
Subject: Re: [PATCH v3 0/3] Enable >0 order folio memory compaction

On 5 Feb 2024, at 3:16, Baolin Wang wrote:

> On 2/3/2024 12:15 AM, Zi Yan wrote:
>> From: Zi Yan <ziy@...dia.com>
>>
>> Hi all,
>>
>> This patchset enables >0 order folio memory compaction, which is one of
>> the prerequisitions for large folio support[1]. It includes the fix[4] for
>> V2 and is on top of mm-everything-2024-01-29-07-19.
>>
>> I am aware of that split free pages is necessary for folio
>> migration in compaction, since if >0 order free pages are never split
>> and no order-0 free page is scanned, compaction will end prematurely due
>> to migration returns -ENOMEM. Free page split becomes a must instead of
>> an optimization.
>>
>> lkp ncompare results for default LRU (-no-mglru) and CONFIG_LRU_GEN are
>> shown at the bottom (on a 8-CPU (Intel Xeon E5-2650 v4 @ 2.20GHz) 16G VM).
>> In sum, most of vm-scalability applications do not see performance change,
>> and the others see ~4% to ~26% performance boost under default LRU and
>> ~2% to ~6% performance boost under CONFIG_LRU_GEN.
>
> For the whole series, looks good to me. And I did not find any regression after running thpcompact. So feel free to add:
> Reviewed-by: Baolin Wang <baolin.wang@...ux.alibaba.com>
> Tested-by: Baolin Wang <baolin.wang@...ux.alibaba.com>

Thank you for the review and testing.

--
Best Regards,
Yan, Zi

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