linux-kernel - Re: [PATCH v2] mm: Enable suspend-only swap spaces

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Message-ID: <20210727120135.GA32265@duo.ucw.cz>
Date:   Tue, 27 Jul 2021 14:01:35 +0200
From:   Pavel Machek <pavel@....cz>
To:     David Hildenbrand <david@...hat.com>
Cc:     Michal Hocko <mhocko@...e.com>, Evan Green <evgreen@...omium.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        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>,
        Vlastimil Babka <vbabka@...e.cz>, linux-kernel@...r.kernel.org,
        linux-mm@...ck.org, linux-api@...r.kernel.org
Subject: Re: [PATCH v2] mm: Enable suspend-only swap spaces

Hi!

> > Could you expand some more on why a strict exclusion is really
> > necessary? I do understand that one might not want to have swap storage
> > available all the time but considering that swapon is really a light
> > operation so something like the following should be a reasonable
> > workaround, no?
> > 	swapon storage/file
> > 	s2disk
> > 	swapoff storage
> 
> I'm certainly not a hibernation expert, but I'd guess this can also be
> triggered by HW events, so from the kernel and not only from user space
> where your workaround would apply.

I should know about hibernation, and I'm not aware of any case where
we do hibernation from kernel. Userspace should be always involved.

Best regards,
								Pavel

-- 
http://www.livejournal.com/~pavelmachek

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