linux-kernel - Re: [RFC 03/11] mm: remove SWAP

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Message-Id: <339d97b2-aeda-29ff-514c-d883e87c7a14@linux.vnet.ibm.com>
Date:   Thu, 2 Mar 2017 20:12:59 +0530
From:   Anshuman Khandual <khandual@...ux.vnet.ibm.com>
To:     Minchan Kim <minchan@...nel.org>,
        Andrew Morton <akpm@...ux-foundation.org>
Cc:     kernel-team@....com, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org, Johannes Weiner <hannes@...xchg.org>,
        Michal Hocko <mhocko@...e.com>, Shaohua Li <shli@...nel.org>
Subject: Re: [RFC 03/11] mm: remove SWAP_DIRTY in ttu

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().