Clayton Craft
49b9e02ddf
This "size"/factor/percentage represents the total amount of **uncompressed** data that is allowed to be written to the zram-backed swap device. It is **not** the amount of RAM to use for zram swap (as I had previously and erroneously thought.) What this means is that if we set the percent to 50% on a device with 3GB of RAM then up to 1.5GB of *uncompressed* data can be written to it, BUT since compression algos usually do better than a ratio of 1:1... less than 1.5GB of RAM will actually be occupied by this data when it is compressed. A 1.5:1 compression ratio seems relatively safe to assume, even if we use lz4 (which is less "good" at compressing than zstd), so I propose we set the size to 150%. Some distros (PureOS) set this higher (200%), but I think we should be somewhat conservative since we want to avoid any thrashing in case the compression ratio at runtime ends up being less than 2:1 for some reason. This does set a limit of 50% for devices with >32GB of RAM, to reduce overhead with using a larger amount of zram swap. The kernel documentation for zram suggests there's a 0.1% overhead, so if we let this amount get large then it could be tens or hundreds of MB of RAM "wasted." The amount I chose is kinda arbitrary, I think this can be improved later. At the very least, users can change this amount in the deviceinfo variable. Fixes #4250 Signed-off-by: Clayton Craft <craftyguy@postmarketos.org> Part-of: <https://gitlab.postmarketos.org/postmarketOS/pmaports/-/merge_requests/7754>
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