netdev - Re: [RFC PATCH 12/12] PM / hibernate: update the resume offset on SNAPSHOT_SET_SWAP

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Message-ID: <23092841-89AD-4D68-9790-AF0BD8702F0A@amazon.com>
Date:   Thu, 14 Jun 2018 19:50:15 +0000
From:   "Besogonov, Aleksei" <cyberax@...zon.com>
To:     Pavel Machek <pavel@....cz>,
        "Agarwal, Anchal" <anchalag@...zon.com>
CC:     "tglx@...utronix.de" <tglx@...utronix.de>,
        "mingo@...hat.com" <mingo@...hat.com>,
        "hpa@...or.com" <hpa@...or.com>, "x86@...nel.org" <x86@...nel.org>,
        "boris.ostrovsky@...cle.com" <boris.ostrovsky@...cle.com>,
        "konrad.wilk@...cle.com" <konrad.wilk@...cle.com>,
        "roger.pau@...rix.com" <roger.pau@...rix.com>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "jgross@...e.com" <jgross@...e.com>,
        "xen-devel@...ts.xenproject.org" <xen-devel@...ts.xenproject.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "Kamata, Munehisa" <kamatam@...zon.com>,
        "van der Linden, Frank" <fllinden@...zon.com>,
        "Vaidyeshwara, Vallish" <vallish@...zon.com>,
        "Anbalagane, Guru" <guruanb@...zon.com>,
        "Valentin, Eduardo" <eduval@...zon.com>,
        "rjw@...ysocki.net" <rjw@...ysocki.net>,
        "len.brown@...el.com" <len.brown@...el.com>,
        "linux-pm@...r.kernel.org" <linux-pm@...r.kernel.org>
Subject: Re: [RFC PATCH 12/12] PM / hibernate: update the resume offset on
 SNAPSHOT_SET_SWAP_AREA

(sorry for top-posting)

Well, not completely broken. It just required a restart for the offset setting to take an effect.

On 6/14/18, 12:46, "Pavel Machek" <pavel@....cz> wrote:

    Hi!
    
    > From: Aleksei Besogonov <cyberax@...zon.com>
    > 
    > The SNAPSHOT_SET_SWAP_AREA is supposed to be used to set the hibernation
    > offset on a running kernel to enable hibernating to a swap file.
    > However, it doesn't actually update the swsusp_resume_block variable. As
    > a result, the hibernation fails at the last step (after all the data is
    > written out) in the validation of the swap signature in
    > mark_swapfiles().
    > 
    > Before this patch, the command line processing was the only place where
    > swsusp_resume_block was set.
    
    Are you saying that suspend-to-file was broken, even on
    non-virtualized systems?
    
    If so, we may this to go in first...
    								Pavel
    								
    -- 
    (english) http://www.livejournal.com/~pavelmachek
    (cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html