linux-kernel - Re: [PATCH mmotm] mm: __isolate_lru_page_prepare() in isolate_migratepages

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Date:   Sun, 6 Mar 2022 14:07:40 -0800 (PST)
From:   David Rientjes <rientjes@...gle.com>
To:     Hugh Dickins <hughd@...gle.com>
cc:     Andrew Morton <akpm@...ux-foundation.org>,
        Alex Shi <alexs@...nel.org>,
        Alexander Duyck <alexander.duyck@...il.com>,
        linux-kernel@...r.kernel.org, linux-mm@...ck.org
Subject: Re: [PATCH mmotm] mm: __isolate_lru_page_prepare() in
 isolate_migratepages_block()

On Fri, 4 Mar 2022, Hugh Dickins wrote:

> __isolate_lru_page_prepare() conflates two unrelated functions, with
> the flags to one disjoint from the flags to the other; and hides some
> of the important checks outside of isolate_migratepages_block(), where
> the sequence is better to be visible.  It comes from the days of lumpy
> reclaim, before compaction, when the combination made more sense.
> 
> Move what's needed by mm/compaction.c isolate_migratepages_block() inline
> there, and what's needed by mm/vmscan.c isolate_lru_pages() inline there.
> 
> Shorten "isolate_mode" to "mode", so the sequence of conditions is easier
> to read.  Declare a "mapping" variable, to save one call to page_mapping()
> (but not another: calling again after page is locked is necessary).
> Simplify isolate_lru_pages() with a "move_to" list pointer.
> 
> Signed-off-by: Hugh Dickins <hughd@...gle.com>

Acked-by: David Rientjes <rientjes@...gle.com>