mirror_zfs/module
Alexander Motin f3969ea78b Optimize small random numbers generation
In all places except two spa_get_random() is used for small values,
and the consumers do not require well seeded high quality values.
Switch those two exceptions directly to random_get_pseudo_bytes()
and optimize spa_get_random(), renaming it to random_in_range(),
since it is not related to SPA or ZFS in general.

On FreeBSD directly map random_in_range() to new prng32_bounded() KPI
added in FreeBSD 13.  On Linux and in user-space just reduce the type
used to uint32_t to avoid more expensive 64bit division.

Reviewed-by: Ryan Moeller <ryan@iXsystems.com>
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Alexander Motin <mav@FreeBSD.org>
Sponsored-By: iXsystems, Inc.
Closes #12183
2021-09-14 12:10:17 -07:00
..
avl Fix various typos 2021-04-07 13:27:11 -07:00
icp Replace ZoL with OpenZFS where applicable 2021-05-10 12:16:46 -07:00
lua cppcheck: integrete cppcheck 2021-01-26 16:12:26 -08:00
nvpair Links in Source Files 2020-09-02 09:42:12 -07:00
os Optimize small random numbers generation 2021-09-14 12:10:17 -07:00
spl Cleanup linux module kbuild files 2020-06-10 09:24:15 -07:00
unicode Fix various typos 2021-04-07 13:27:11 -07:00
zcommon Fix AVX512BW Fletcher code on AVX512-but-not-BW machines 2021-05-10 12:05:36 -07:00
zfs Optimize small random numbers generation 2021-09-14 12:10:17 -07:00
zstd Fix build with KASAN 2021-06-29 13:14:42 -07:00
.gitignore Cleanup linux module kbuild files 2020-06-10 09:24:15 -07:00
Kbuild.in Add zstd support to zfs 2020-08-20 10:30:06 -07:00
Makefile.bsd Restore FreeBSD resource usage accounting 2021-02-19 22:34:33 -08:00
Makefile.in FreeBSD module --enable-debug --enable-invariants 2021-03-05 12:16:41 -08:00