Using both swaps on microSD card with backup swap on eMMC (for being able to boot, if microSD refuses to work) is very good. It should be quite easy, to implement it in ereswap - although, for 2 next weeks, I have very limited time for investigating it. Any input - like patches or even improved ereswap - highly appreciated. It would be great, to allow - tuneable by configuration - usage of any variant, no matter of partition layout (2 swaps, 3 swaps, eMMC, microSD...)

BTW, I agree that flip/flop on microSD only is slightly faster and saves eMMC from wear, but it doesn't affect SD card wear&tear - wear leveling is implemented on hardware level of microSD card, so it doesn't matter - for that case - if 1 or 1 partition is used on microSD (flip could be used all the time, with flop being idle, and wear would be exactly same as with flip and flop used one after another).

/Estel