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Date:   Tue, 12 Sep 2023 13:32:38 -0400
From:   Johannes Weiner <hannes@cmpxchg.org>
To:     Zi Yan <zi.yan@sent.com>
Cc:     linux-mm@kvack.org, linux-kernel@vger.kernel.org,
        Zi Yan <ziy@nvidia.com>, Ryan Roberts <ryan.roberts@arm.com>,
        Andrew Morton <akpm@linux-foundation.org>,
        "Matthew Wilcox (Oracle)" <willy@infradead.org>,
        David Hildenbrand <david@redhat.com>,
        "Yin, Fengwei" <fengwei.yin@intel.com>,
        Yu Zhao <yuzhao@google.com>, Vlastimil Babka <vbabka@suse.cz>,
        Baolin Wang <baolin.wang@linux.alibaba.com>,
        Kemeng Shi <shikemeng@huaweicloud.com>,
        Mel Gorman <mgorman@techsingularity.net>,
        Rohan Puri <rohan.puri15@gmail.com>,
        Mcgrof Chamberlain <mcgrof@kernel.org>,
        Adam Manzanares <a.manzanares@samsung.com>,
        John Hubbard <jhubbard@nvidia.com>
Subject: Re: [RFC PATCH 1/4] mm/compaction: add support for >0 order folio
 memory compaction.
Message-ID: <20230912173238.GB34089@cmpxchg.org>
References: <20230912162815.440749-1-zi.yan@sent.com>
 <20230912162815.440749-2-zi.yan@sent.com>
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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.