linux-kernel - Re: [PATCH] mm: fix is_pinnable

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Date:   Tue, 3 May 2022 03:15:24 +0200
From:   David Hildenbrand <david@...hat.com>
To:     Minchan Kim <minchan@...nel.org>
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        linux-mm <linux-mm@...ck.org>,
        LKML <linux-kernel@...r.kernel.org>,
        John Hubbard <jhubbard@...dia.com>,
        John Dias <joaodias@...gle.com>
Subject: Re: [PATCH] mm: fix is_pinnable_page against on cma page


>>>> However, I assume we have the same issue right now already with
>> ZONE_MOVABLE and MIGRATE_CMA when trying to pin a page residing on these
> 
> ZONE_MOVALBE is also changed dynamically?
> 

Sorry, with "same issue" I meant failing to pin if having to migrate and
the page is temporarily unmovable.

>> there are temporarily unmovable and we fail to migrate. But it would now
>> apply even without ZONE_MOVABLE or MIGRATE_CMA. Hm...
> 
> Didn't parse your last mention.

On a system that neither uses ZONE_MOVABLE nor MIGRATE_CMA we might have
to migrate now when pinning.

-- 
Thanks,

David / dhildenb