linux-kernel - Re: [PATCH v1] mm: Enable suspend-only swap spaces

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Message-ID: <c178b1f1-73ee-d5a8-dfda-b2d53aa8d83d@redhat.com>
Date:   Mon, 5 Jul 2021 09:44:30 +0200
From:   David Hildenbrand <david@...hat.com>
To:     Evan Green <evgreen@...omium.org>,
        Andrew Morton <akpm@...ux-foundation.org>
Cc:     Alex Shi <alexs@...nel.org>, Alistair Popple <apopple@...dia.com>,
        Jens Axboe <axboe@...nel.dk>,
        Johannes Weiner <hannes@...xchg.org>,
        Joonsoo Kim <iamjoonsoo.kim@....com>,
        "Matthew Wilcox (Oracle)" <willy@...radead.org>,
        Miaohe Lin <linmiaohe@...wei.com>,
        Minchan Kim <minchan@...nel.org>,
        Stephen Rothwell <sfr@...b.auug.org.au>,
        Vlastimil Babka <vbabka@...e.cz>, linux-kernel@...r.kernel.org,
        linux-mm@...ck.org
Subject: Re: [PATCH v1] mm: Enable suspend-only swap spaces

On 30.06.21 19:07, Evan Green wrote:
> Currently it's not possible to enable hibernation without also enabling
> generic swap for a given swap area. These two use cases are not the
> same. For example there may be users who want to enable hibernation,
> but whose drives don't have the write endurance for generic swap
> activities.
> 
> Add a new SWAP_FLAG_NOSWAP that adds a swap region but refuses to allow
> generic swapping to it. This region can still be wired up for use in
> suspend-to-disk activities, but will never have regular pages swapped to
> it.

Just to confirm: things like /proc/meminfo won't show this "swap that's 
not actually swap" as free/total swap, correct? Maybe it's worth 
spelling the expected system behavior out here.


-- 
Thanks,

David / dhildenb