linux-kernel - Re: PM: hibernation: Image allocation is 28906 pages short

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Date: Fri, 29 Mar 2024 19:59:14 +0100
From: Paul Menzel <pmenzel@...gen.mpg.de>
To: Pavel Machek <pavel@....cz>
Cc: "Rafael J. Wysocki" <rafael@...nel.org>, linux-pm@...r.kernel.org,
 LKML <linux-kernel@...r.kernel.org>
Subject: Re: PM: hibernation: Image allocation is 28906 pages short

Dear Pavel,

Thank you very much.

Am 29.03.24 um 18:03 schrieb Pavel Machek:

>> On a Dell XPS 13 9360/0596KF, BIOS 2.21.0 06/02/2022 with Debian
>> sid/unstable and self-built Linux 6.9-rc1+ with one patch on top [1] and
>> KASAN enabled
>>
>>      $ git log --no-decorate --oneline -2 a2ce022afcbb
>>      a2ce022afcbb [PATCH] kbuild: Disable KCSAN for autogenerated *.mod.c intermediaries
>>      8d025e2092e2 Merge tag 'erofs-for-6.9-rc2-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/xiang/erofs
>>
>> the system tried to hibernate, but failed:
> 
>> Where is that image allocated? On the disk? There is still 65 GB of space,
>> so 16 GB of memory should fit? Could the error message be improved, so users
>> know more details to fix it?
> 
> In swap. See docs.

Thank you. Unfortunately, I am not seeing my case described in 
`Documentation/power/`. Only:

> Q:
>   If my application(s) causes lots of memory & swap space to be used
>   (over half of the total system RAM), is it correct that it is likely
>   to be useless to try to suspend to disk while that app is running?
> 
> A:
>   No, it should work okay, as long as your app does not mlock()
>   it. Just prepare big enough swap partition.

I have 16 GB RAM and 8 GB swap partition.

     $ LANG= free
                    total        used        free      shared 
buff/cache   available
     Mem:        13828768     9760192     3115932     5383256 
6681400     4068576
     Swap:        8387904     1531820     6856084

Shouldn’t user space (systemd or GNOME?) then know beforehand if 
hibernate is possible? Is there a script for users to check, if 
hibernation would be possible?

Kind regards,

Paul