linux-kernel - Re: [PATCH -V11 6/9] mm/vmscan: add helper for querying ability to age anonymous pages

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Message-ID: <0D3C3C4C-C25A-484F-A486-0C2ED5737578@nvidia.com>
Date:   Wed, 21 Jul 2021 17:15:25 -0400
From:   Zi Yan <ziy@...dia.com>
To:     Huang Ying <ying.huang@...el.com>
Cc:     Andrew Morton <akpm@...ux-foundation.org>, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Yang Shi <shy828301@...il.com>,
        Greg Thelen <gthelen@...gle.com>,
        Michal Hocko <mhocko@...e.com>, Wei Xu <weixugc@...gle.com>,
        Oscar Salvador <osalvador@...e.de>,
        David Rientjes <rientjes@...gle.com>,
        Dan Williams <dan.j.williams@...el.com>,
        David Hildenbrand <david@...hat.com>,
        Keith Busch <kbusch@...nel.org>,
        Yang Shi <yang.shi@...ux.alibaba.com>
Subject: Re: [PATCH -V11 6/9] mm/vmscan: add helper for querying ability to age anonymous pages

On 21 Jul 2021, at 2:39, Huang Ying wrote:

> From: Dave Hansen <dave.hansen@...ux.intel.com>
>
> Anonymous pages are kept on their own LRU(s).  These lists could
> theoretically always be scanned and maintained.  But, without swap, there
> is currently nothing the kernel can *do* with the results of a scanned,
> sorted LRU for anonymous pages.
>
> A check for '!total_swap_pages' currently serves as a valid check as to
> whether anonymous LRUs should be maintained.  However, another method will
> be added shortly: page demotion.
>
> Abstract out the 'total_swap_pages' checks into a helper, give it a
> logically significant name, and check for the possibility of page
> demotion.
>
> Link: https://lkml.kernel.org/r/20210715055145.195411-7-ying.huang@intel.com
> Signed-off-by: Dave Hansen <dave.hansen@...ux.intel.com>
> Signed-off-by: "Huang, Ying" <ying.huang@...el.com>
> Reviewed-by: Yang Shi <shy828301@...il.com>
> Reviewed-by: Greg Thelen <gthelen@...gle.com>
> Cc: Michal Hocko <mhocko@...e.com>
> Cc: Wei Xu <weixugc@...gle.com>
> Cc: Oscar Salvador <osalvador@...e.de>
> Cc: Zi Yan <ziy@...dia.com>
> Cc: David Rientjes <rientjes@...gle.com>
> Cc: Dan Williams <dan.j.williams@...el.com>
> Cc: David Hildenbrand <david@...hat.com>
> Cc: Keith Busch <kbusch@...nel.org>
> Cc: Yang Shi <yang.shi@...ux.alibaba.com>
> Signed-off-by: Andrew Morton <akpm@...ux-foundation.org>
> ---
>  mm/vmscan.c | 20 ++++++++++++++++++--
>  1 file changed, 18 insertions(+), 2 deletions(-)
>

LGTM. Reviewed-by: Zi Yan <ziy@...dia.com>

—
Best Regards,
Yan, Zi

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