linux-kernel - Re: [PATCH 1/1] suspend: delete sys

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Date:	Mon, 11 May 2015 16:22:26 -0400
From:	Len Brown <lenb@...nel.org>
To:	Dave Chinner <david@...morbit.com>
Cc:	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	Linux PM list <linux-pm@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Len Brown <len.brown@...el.com>
Subject: Re: [PATCH 1/1] suspend: delete sys_sync()

On Sun, May 10, 2015 at 9:44 PM, Dave Chinner <david@...morbit.com> wrote:

> ...Please explain what your use case is that makes this
> so prohibitively expensive it needs to be removed.

wake on packet, process packet without turning on the display,
immediately suspend.  Do this potentially several times per second.

>> The user-space utilities s2ram and s2disk choose to invoke sync() today.
>> A user can invoke suspend directly via /sys/power/state to skip that cost.
>
> So, you want to have s2disk write all the dirty pages in memory to
> the suspend image, rather than to the filesystem?

The s2disk utility is unchanged by this proposal, it already includes a sync().

cheers,
Len Brown, Intel Open Source Technology Center
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