[maemo-developers] [maemo-developers] swapfile is a huge improvement!

[From: Danny Milosavljevic]

Hi,

Am Sonntag, den 15.01.2006, 18:33 +0200 schrieb Juha Yrjölä:
> On Sat, 2006-01-14 at 11:55 -0500, ext Vladislav Grinchenko wrote:
> 
> > with swap on, what happens to the system when you manually remove the
> > mmc card? Or when you connect the USB cable to the unit?
> 
> Removing the MMC card will definitely cause Bad Things to happen.  It's
> also very tricky to protect against the Bad Things.
> 
> The system should listen on the MMC cover events, and turn off swap
> whenever the MMC cover is opened (which means we have a risk of the card
> departing).  Then the system should hurry to swap in all the pages on
> the MMC partition, which can take a *long* time depending on the amount
> of pages on swap.  

That's okay, put a RED LED next to the MMC card that can only be seen
when the slot is open :)

And when user isn't supposed to remove card, light it (on activity, or
when used for swap)... The one who still removes it deserves anything
happening after that ...

> Then, most likely, physical memory would run out.  At
> that point we are in a very bad situation indeed, if pages from some
> critical system processes are still swapped out.

Yeah ...

> 
> USB Mass Storage is not a problem if the swap resides on a separate
> partition.
> 
> Cheers,
> Juha

cheers,
   Danny