linux-kernel - RE: [RFC] power/hibernate: Make passing hibernate offsets more friendly

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Message-ID: <836fd1d7923d4432b17607351b302a56@ausx13mpc124.AMER.DELL.COM>
Date:   Fri, 2 Mar 2018 13:41:12 +0000
From:   <Mario.Limonciello@...l.com>
To:     <rafael@...nel.org>
CC:     <andy.shevchenko@...il.com>, <rjw@...ysocki.net>,
        <linux-acpi@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: RE: [RFC] power/hibernate: Make passing hibernate offsets more
 friendly

> -----Original Message-----
> From: rjwysocki@...il.com [mailto:rjwysocki@...il.com] On Behalf Of Rafael J.
> Wysocki
> Sent: Friday, March 2, 2018 3:43 AM
> To: Limonciello, Mario <Mario_Limonciello@...l.com>
> Cc: Andy Shevchenko <andy.shevchenko@...il.com>; Rafael J. Wysocki
> <rjw@...ysocki.net>; ACPI Devel Maling List <linux-acpi@...r.kernel.org>; Linux
> Kernel Mailing List <linux-kernel@...r.kernel.org>
> Subject: Re: [RFC] power/hibernate: Make passing hibernate offsets more friendly
> 
> On Wed, Feb 28, 2018 at 9:05 PM,  <Mario.Limonciello@...l.com> wrote:
> >
> >
> >> -----Original Message-----
> >> From: Andy Shevchenko [mailto:andy.shevchenko@...il.com]
> >> Sent: Wednesday, February 28, 2018 12:11 PM
> >> To: Limonciello, Mario <Mario_Limonciello@...l.com>
> >> Cc: Rafael J . Wysocki <rjw@...ysocki.net>; ACPI Devel Maling List <linux-
> >> acpi@...r.kernel.org>; LKML <linux-kernel@...r.kernel.org>
> >> Subject: Re: [RFC] power/hibernate: Make passing hibernate offsets more friendly
> >>
> >> On Wed, Feb 28, 2018 at 7:43 PM, Mario Limonciello
> >> <mario.limonciello@...l.com> wrote:
> >> > Currently the only way to specify a hibernate offset for a swap
> >> > file is on the kernel command line.
> >> >
> >> > This makes some changes to improve:
> >> > 1) Add a new /sys/power/disk_offset that lets userspace specify
> >> > the offset and disk to use when initiating a hibernate cycle.
> >> >
> >> > 2) Adjust /sys/power/resume interpretation to also read in an
> >> > offset.
> >>
> >> Read is okay per se (not consistent though), showing is not.
> >> It might break an ABI.
> >
> > Right this is part of why I was proposing making a new attribute.
> >
> > The current RFC implementation I sent keeps the read output the
> > same for /sys/power/resume.
> 
> You also need to retain the write behavior of it.
> 
> A new attribute is fine if it helps, but the behavior of the existing
> one cannot change (both sides).

Thanks for your feedback, I'll adjust it as such.