Re: syncing the disks when entering sleep

[Nigel Cunningham <ncunningham@crca.org.au>]

Hi.

Pavel Machek wrote:
>> So you're asking to give this knob "one shot behavior" (i.e. "then
>> next sleep won't sync")?
> 
> Yes.
> 
>> But I'm primarily interested in the behavior on embedded systems
>> (where you control all the processes running -- there's no "user"
>> involved.
>> 
> 
> Well, then "one shot behaviour" does not hurt you, right?
> 
>> If a user starts messing with default settings, any unwanted
>> behavior is the users problem (besides, this should only be
>> writable as root).
>> 
> 
> I'd rather not add traps for the user unless absolutely neccessary.
> Not even for root user. Pavel

But that's precisely what you're doing. You're advocating making the
behaviour inconsistent. If what you're suggesting is done, you won't be
able to simply cat the sysfs entry to know whether sys_syncing is going
to be done on the next cycle. You'll also have to have knowledge of
whether a cycle has been done since the last time the value is set. The
end result will be someone getting trapped and caught out because they
think '1' in /sys/power/dont_sync (or whatever it's called) means what
it says.

Regards,

Nigel