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Subject: Re: [RFC 03/11] mm: remove SWAP_DIRTY in ttu
References: <1488436765-32350-1-git-send-email-minchan@kernel.org>
 <1488436765-32350-4-git-send-email-minchan@kernel.org>
From: Anshuman Khandual <khandual@linux.vnet.ibm.com>
Date: Thu, 2 Mar 2017 20:12:59 +0530
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To: Minchan Kim <minchan@kernel.org>, Andrew Morton <akpm@linux-foundation.org>
Cc: kernel-team@lge.com, linux-mm@kvack.org, linux-kernel@vger.kernel.org, Johannes Weiner <hannes@cmpxchg.org>, Michal Hocko <mhocko@suse.com>, Shaohua Li <shli@kernel.org>

On 03/02/2017 12:09 PM, Minchan Kim wrote:
> If we found lazyfree page is dirty, ttuo can just SetPageSwapBakced
> in there like PG_mlocked page and just return with SWAP_FAIL which
> is very natural because the page is not swappable right now so that
> vmscan can activate it. There is no point to introduce new return
> value SWAP_DIRTY in ttu at the moment.

Yeah makes sense. In the process, SetPageSwapBacked marking of the page
is moved from the shrink_page_list() to try_to_unmap_one().

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