Re: [PATCH 1/1] suspend: delete sys_sync()

[Len Brown]

On Sun, May 10, 2015 at 9:44 PM, Dave Chinner <david@xxxxxxxxxxxxx> 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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