linux-kernel - Re: [PATCH 01/10] mm/page-flags: introduce PageHighMemZone()

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Message-ID: <1b13af90-6e76-bde7-e861-5eb99c249e1d@codeaurora.org>
Date:   Wed, 10 Feb 2021 18:26:49 +0530
From:   Prakash Gupta <guptap@...eaurora.org>
To:     Joonsoo Kim <js1304@...il.com>, Vlastimil Babka <vbabka@...e.cz>
Cc:     Matthew Wilcox <willy@...radead.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Linux Memory Management List <linux-mm@...ck.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Laura Abbott <labbott@...hat.com>,
        "Aneesh Kumar K . V" <aneesh.kumar@...ux.ibm.com>,
        Mel Gorman <mgorman@...hsingularity.net>,
        Michal Hocko <mhocko@...e.com>,
        Johannes Weiner <hannes@...xchg.org>,
        Roman Gushchin <guro@...com>, Minchan Kim <minchan@...nel.org>,
        Rik van Riel <riel@...riel.com>,
        Christian Koenig <christian.koenig@....com>,
        Huang Rui <ray.huang@....com>,
        Eric Biederman <ebiederm@...ssion.com>,
        "Rafael J . Wysocki" <rjw@...ysocki.net>,
        Pavel Machek <pavel@....cz>,
        Joonsoo Kim <iamjoonsoo.kim@....com>
Subject: Re: [PATCH 01/10] mm/page-flags: introduce PageHighMemZone()


On 4/21/2020 12:13 PM, Joonsoo Kim wrote:
> This patchset is a preparation for my future patchset "mm/cma: manage the memory
> of the CMA area by using the ZONE_MOVABLE" [1] to solve the many CMA problems.
>
> CMA areas can be on the all the memory range, from ZONE_DMA to ZONE_HIGHMEM.
> And, in my future patchset [1], all the CMA areas are managed through
> the ZONE_MOVABLE
> and the range of the ZONE_MOVABLE is extended to cover all the CMA
> areas. In this
> case, following scenario would be possible.
>
> CMA area 1: 32MB size on the memory range 16MB~48MB (originally on the
> ZONE_NORMAL)
> CMA area 2: 32MB size on the memory range 896MB~928MB (originally on
> the ZONE_HIGHMEM)
>
> With my future patchset [1], ZONE_MOVABLE manages all the pages from
> CMA area 1 and 2.
> So, ZONE_MOVABLE has both direct mapped page and un-mapped page. Since one zone
> has two types of pages, current PageHighMem() implemented by using
> zone index could not
> work correctly. So, I make this patchset to change the PagHighMem()
> implementation.

Hello Joonsoo,

Resurrecting this thread. I wanted to check if you are still working on [1].

If yes, would you be posting it soon.

I think these would be useful for high CMA system.


Thanks,

Prakash