Commit Graph

4 Commits

Author SHA1 Message Date
Darrick J. Wong
be28368b2c bcachefs: time_stats: shrink time_stat_buffer for better alignment
Shrink this percpu object by one array element so that the object size
becomes exactly 512 bytes.  This will lead to more efficient memory use,
hopefully.

Signed-off-by: Darrick J. Wong <djwong@kernel.org>
Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
2024-03-13 21:38:03 -04:00
Darrick J. Wong
273960b8f3 bcachefs: time_stats: split stats-with-quantiles into a separate structure
Currently, struct time_stats has the optional ability to quantize the
information that it collects.  This is /probably/ useful for callers who
want to see quantized information, but it more than doubles the size of
the structure from 224 bytes to 464.  For users who don't care about
that (e.g. upcoming xfs patches) and want to avoid wasting 240 bytes per
counter, split the two into separate pieces.

Signed-off-by: Darrick J. Wong <djwong@kernel.org>
Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
2024-03-13 21:38:01 -04:00
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
f1ca1abfb0 bcachefs: pull out time_stats.[ch]
prep work for lifting out of fs/bcachefs/

Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
2024-03-13 21:30:35 -04:00