Hibernate brokes my swap partition.
news at pointerstop.ca
Mon Mar 13 18:06:20 UTC 2006
Carl Karsten wrote:
> Can someone explain or give me a URL of how this works? How can it use
> the swap
> partition? Let's say I have 512mb ram and 1g swap. I run some apps that
> all the ram and all but 100mb of swap. What happens when it hibernates?
OK, I don't know the details of the implementation (I did a few years back,
but it didn't actually work for me then :-) ), but essentially:
- freeze all processes: at this point the only thing that runs is the
- flush all read-only pages out of virtual memory (it's possible that it
actually only gets rid of as much as it needs): on startup, the swapper
will reload them for processes that need those pages back. On most
systems, many of those pages are never going to be reused anyway.
- copy all real-memory pages to swap: fail if there isn't enough swap space.
- change the swap-space signature so that the boot code can recognize it
- recognize the swap-space signature, and go into resume mode
- fix the swap-space signature
Then the first thing the OS swapping routines are going to do is bring some
of those swapped pages back into real memory.
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