linux-kernel - Re: [PATCH 2/2] mm: rename and move get/set_freepage

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Message-ID: <alpine.DEB.2.10.1507211547000.3833@chino.kir.corp.google.com>
Date:	Tue, 21 Jul 2015 15:47:11 -0700 (PDT)
From:	David Rientjes <rientjes@...gle.com>
To:	Vlastimil Babka <vbabka@...e.cz>
cc:	Andrew Morton <akpm@...ux-foundation.org>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org,
	"minkyung88.kim" <minkyung88.kim@....com>, kmk3210@...il.com,
	Seungho Park <seungho1.park@....com>,
	Joonsoo Kim <iamjoonsoo.kim@....com>,
	Minchan Kim <minchan@...nel.org>,
	Michal Nazarewicz <mina86@...a86.com>,
	Laura Abbott <lauraa@...eaurora.org>,
	Naoya Horiguchi <n-horiguchi@...jp.nec.com>,
	"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
	Mel Gorman <mgorman@...e.de>,
	Johannes Weiner <hannes@...xchg.org>
Subject: Re: [PATCH 2/2] mm: rename and move get/set_freepage_migratetype

On Tue, 21 Jul 2015, Vlastimil Babka wrote:

> The pair of get/set_freepage_migratetype() functions are used to cache
> pageblock migratetype for a page put on a pcplist, so that it does not have
> to be retrieved again when the page is put on a free list (e.g. when pcplists
> become full). Historically it was also assumed that the value is accurate for
> pages on freelists (as the functions' names unfortunately suggest), but that
> cannot be guaranteed without affecting various allocator fast paths. It is in
> fact not needed and all such uses have been removed.
> 
> The last remaining (but pointless) usage related to pages of freelists is in
> move_freepages(), which this patch removes.
> 
> To prevent further confusion, rename the functions to
> get/set_pcppage_migratetype() and expand their description. Since all the
> users are now in mm/page_alloc.c, move the functions there from the shared
> header.
> 
> Signed-off-by: Vlastimil Babka <vbabka@...e.cz>
> Cc: Joonsoo Kim <iamjoonsoo.kim@....com>
> Cc: Minchan Kim <minchan@...nel.org>
> Cc: Michal Nazarewicz <mina86@...a86.com>
> Cc: Laura Abbott <lauraa@...eaurora.org>
> Cc: Naoya Horiguchi <n-horiguchi@...jp.nec.com>
> Cc: Kirill A. Shutemov <kirill.shutemov@...ux.intel.com>
> Cc: Mel Gorman <mgorman@...e.de>
> Cc: Johannes Weiner <hannes@...xchg.org>

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