3 Commits

Author	SHA1	Message	Date
Darrick J. Wong	4b4f0876ab	bcachefs: mean_and_variance: put struct mean_and_variance_weighted on a diet ... The only caller of this code (time_stats) always knows the weights and whether or not any information has been collected. Pass this information into the mean and variance code so that it doesn't have to store that information. This reduces the structure size from 24 to 16 bytes, which shrinks each time_stats counter to 192 bytes from 208. Signed-off-by: Darrick J. Wong <djwong@kernel.org> Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>	2024-03-13 21:37:58 -04:00
Kent Overstreet	65bc410907	mean and variance: More tests ... Add some more tests that test conventional and weighted mean simultaneously, and with a table of values that represents events that we'll be using this to look for so we can verify-by-eyeball that the output looks sane. Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>	2023-10-22 17:10:02 -04:00
Daniel Hill	92095781e0	bcachefs: Mean and variance ... This module provides a fast 64bit implementation of basic statistics functions, including mean, variance and standard deviation in both weighted and unweighted variants, the unweighted variant has a 32bit limitation per sample to prevent overflow when squaring. Signed-off-by: Daniel Hill <daniel@gluo.nz> Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>	2023-10-22 17:09:43 -04:00