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this post was submitted on 04 Jun 2024
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Linux is a family of open source Unix-like operating systems based on the Linux kernel, an operating system kernel first released on September 17, 1991 by Linus Torvalds. Linux is typically packaged in a Linux distribution (or distro for short).
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I mean, the swap file just has to be large enough to accommodate your system RAM. Everything in zram is already in system RAM, just compressed.
Okay, my concern was that if I have, say 1.4G in zram, that would unpack to, say, 2G, which, when added to 7G, would go over the 8G limit. I was worried that RAM might be saved in its uncompressed manner, when saved in the swapfile for hibernation.
I think the hibernation image is compressed by default (all of it). Also, some of what is in your RAM is just files from disk. I think those don't need to be saved into the hibernation image, since they're already on disk. For example, libc.so.6 would definitely be in RAM and in use, but it's also on disk, so no need to save it during hibernate.
So the hibernation image should be substantially smaller than your used RAM.