On Mon, 24 Oct 2022 12:05:53 -0700 Stefan Roesch <shr@xxxxxxxxxxxx> wrote: > To get finer granularity for ratio calculations use part per 1000 > instead of percentiles. This is especially important if we want to > automatically convert byte values to ratios. Otherwise the values that > are actually used can be quite different. This is also important for > machines with more main memory (1% of 256GB is already 2.5GB). > > ... > This changes an existing userspace interface, doesn't it? /sys/class/bdi/<bdi>/min_ratio. Can't do that! We could add a new interace to the same thing, I guess. /sys/class/bdi/<bdi>/min_ratio_fine or whatever. We might want to go for more than 100->1000, too. Otherwise in a few years we'll be adding /sys/class/bdi/<bdi>/min_ratio_even_finer. Also, this patch forgot to update Documentation/ABI/testing/sysfs-class-bdi.
