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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
Randy Dunlap	920388254f	bcachefs: mean and variance: fix kernel-doc for function params Add missing function parameter descriptions in mean_and_variance.c. The also eliminates the "Excess function parameter" warnings. Prevents these kernel-doc warnings: mean_and_variance.c:67: warning: Function parameter or member 's' not described in 'mean_and_variance_get_mean' mean_and_variance.c:78: warning: Function parameter or member 's1' not described in 'mean_and_variance_get_variance' mean_and_variance.c:94: warning: Function parameter or member 's' not described in 'mean_and_variance_get_stddev' mean_and_variance.c:108: warning: Function parameter or member 's' not described in 'mean_and_variance_weighted_update' mean_and_variance.c:108: warning: Function parameter or member 'x' not described in 'mean_and_variance_weighted_update' mean_and_variance.c:108: warning: Excess function parameter 's1' description in 'mean_and_variance_weighted_update' mean_and_variance.c:108: warning: Excess function parameter 's2' description in 'mean_and_variance_weighted_update' mean_and_variance.c:134: warning: Function parameter or member 's' not described in 'mean_and_variance_weighted_get_mean' mean_and_variance.c:143: warning: Function parameter or member 's' not described in 'mean_and_variance_weighted_get_variance' mean_and_variance.c:153: warning: Function parameter or member 's' not described in 'mean_and_variance_weighted_get_stddev' Signed-off-by: Randy Dunlap <rdunlap@infradead.org> Cc: Kent Overstreet <kent.overstreet@linux.dev> Cc: Brian Foster <bfoster@redhat.com> Cc: linux-bcachefs@vger.kernel.org Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>	2024-01-01 11:47:42 -05:00
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

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

Randy Dunlap

920388254f

bcachefs: mean and variance: fix kernel-doc for function params

Add missing function parameter descriptions in mean_and_variance.c.
The also eliminates the "Excess function parameter" warnings.

Prevents these kernel-doc warnings:

mean_and_variance.c:67: warning: Function parameter or member 's' not described in 'mean_and_variance_get_mean'
mean_and_variance.c:78: warning: Function parameter or member 's1' not described in 'mean_and_variance_get_variance'
mean_and_variance.c:94: warning: Function parameter or member 's' not described in 'mean_and_variance_get_stddev'
mean_and_variance.c:108: warning: Function parameter or member 's' not described in 'mean_and_variance_weighted_update'
mean_and_variance.c:108: warning: Function parameter or member 'x' not described in 'mean_and_variance_weighted_update'
mean_and_variance.c:108: warning: Excess function parameter 's1' description in 'mean_and_variance_weighted_update'
mean_and_variance.c:108: warning: Excess function parameter 's2' description in 'mean_and_variance_weighted_update'
mean_and_variance.c:134: warning: Function parameter or member 's' not described in 'mean_and_variance_weighted_get_mean'
mean_and_variance.c:143: warning: Function parameter or member 's' not described in 'mean_and_variance_weighted_get_variance'
mean_and_variance.c:153: warning: Function parameter or member 's' not described in 'mean_and_variance_weighted_get_stddev'

Signed-off-by: Randy Dunlap <rdunlap@infradead.org>
Cc: Kent Overstreet <kent.overstreet@linux.dev>
Cc: Brian Foster <bfoster@redhat.com>
Cc: linux-bcachefs@vger.kernel.org
Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>

2024-01-01 11:47:42 -05:00

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

3 Commits