Re: [RFC] userland swsusp
From: Stefan Rompf
Date: Thu Nov 17 2005 - 02:18:36 EST
Am Mittwoch 16 November 2005 20:07 schrieb Pavel Machek:
> No. Writing to file would trash the filesystem. But you can bmap the file,
> then write to the block device.
And for reading, I could used a device mapper enforced read only mount or
filesystem code from grub.
Hmm, how about a possibility to ask the kernel for a list of free pages on a
swap device? This way, userspace could write the image to swap as the kernel
currently does, avoiding possible trouble with filesystems.
> Better avoid memory allocation.
And all memory allocated and mapped in advance would be part of the image. But
this is totally acceptable for a "suspend helper".
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