Re: shrinking memory for suspend?

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On Mon, 30 Apr 2007, Johannes Berg wrote:

> Hi,
> 
> Paul Mackerras noticed that even for suspend to ram we currently free
> some memory in suspend_prepare. Is that necessary because we freeze
> userspace so devices can allocate a bit of memory for suspend? Why do we
> freeze userspace anyway?

So that user processes don't generate I/O requests while the devices are
suspended -- such requests would be bound to fail.

Alan Stern

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