linux-kernel - Re: [RFC PATCH 1/4] mm/compaction: add support for >0 order folio memory compaction.

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Date:   Tue, 12 Sep 2023 13:38:01 -0400
From:   Zi Yan <ziy@...dia.com>
To:     Johannes Weiner <hannes@...xchg.org>
Cc:     linux-mm@...ck.org, linux-kernel@...r.kernel.org,
        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>,
        Baolin Wang <baolin.wang@...ux.alibaba.com>,
        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>,
        John Hubbard <jhubbard@...dia.com>
Subject: Re: [RFC PATCH 1/4] mm/compaction: add support for >0 order folio
 memory compaction.

On 12 Sep 2023, at 13:32, Johannes Weiner wrote:

> On Tue, Sep 12, 2023 at 12:28:12PM -0400, Zi Yan wrote:
>> @@ -1439,7 +1478,8 @@ fast_isolate_around(struct compact_control *cc, unsigned long pfn)
>>  	if (!page)
>>  		return;
>>
>> -	isolate_freepages_block(cc, &start_pfn, end_pfn, &cc->freepages, 1, false);
>> +	isolate_freepages_block(cc, &start_pfn, end_pfn, &freelist, 1, false);
>> +	sort_free_pages(&freelist, cc->freepages);
>
> Can you make isolate_freepages_block() put the pages directly into a
> sorted struct free_list?
>
> AFAICS, the only place that doesn't technically need it is
> isolate_freepages_range(). But that's then also the sole caller of
> split_map_pages(), which can be made to work on struct free_list too
> without notable overhead.

Sure. Will do that in the next version.

--
Best Regards,
Yan, Zi

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