linux-kernel - Re: [PATCH 3/7] remove putback_lru_pages() in hugepage migration context

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Date:	Fri, 21 Jan 2011 15:40:35 +0900
From:	Minchan Kim <minchan.kim@...il.com>
To:	Naoya Horiguchi <n-horiguchi@...jp.nec.com>
Cc:	Andi Kleen <tatsu@...jp.nec.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Wu Fengguang <fengguang.wu@...el.com>,
	Mel Gorman <mel@....ul.ie>,
	Christoph Lameter <cl@...ux-foundation.org>,
	Huang Ying <ying.huang@...el.com>,
	Fernando Luis Vazquez Cao <fernando@....ntt.co.jp>,
	tony.luck@...el.com, LKML <linux-kernel@...r.kernel.org>,
	linux-mm <linux-mm@...ck.org>
Subject: Re: [PATCH 3/7] remove putback_lru_pages() in hugepage migration context

Hello,

On Fri, Jan 21, 2011 at 3:28 PM, Naoya Horiguchi
<n-horiguchi@...jp.nec.com> wrote:
> This putback_lru_pages() is inserted at cf608ac19c to allow
> memory compaction to count the number of migration failed pages.
>
> But we should not do it for a hugepage because page->lru of a hugepage
> is used differently from that of a normal page:
>
>   in-use hugepage : page->lru is unlinked,
>   free hugepage   : page->lru is linked to the free hugepage list,
>
> so putting back hugepages to LRU lists collapses this rule.
> We just drop this change (without any impact on memory compaction.)
>
> Signed-off-by: Naoya Horiguchi <n-horiguchi@...jp.nec.com>
> Cc: Minchan Kim <minchan.kim@...il.com>

As I said previously, It seems mistake during patch merge.
I didn't add it in my original patch. You can see my final patch.
https://lkml.org/lkml/2010/8/24/248

Anyway, I realized it recently so I sent the patch to Andrew.
Could you see this one?
https://lkml.org/lkml/2011/1/20/241

Thanks for notice me.



-- 
Kind regards,
Minchan Kim
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