Alan Somers a0e01997ec Parallelize vdev_load ... metaslab_init is the slowest part of importing a mature pool, and it must be repeated hundreds of times for each top-level vdev. But its speed is dominated by a few serialized disk accesses. That can lead to import times of > 1 hour for pools with many top-level vdevs on spinny disks. Speed up the import by using a taskqueue to parallelize vdev_load across all top-level vdevs. This also requires adding mutex protection to metaslab_class_t.mc_historgram. The mc_histogram fields were unprotected when that code was first written in "Illumos 4976-4984 - metaslab improvements" (OpenZFS f3a7f6610f). The lock wasn't added until 3dfb57a35e, though it's unclear exactly which fields it's supposed to protect. In any case, it wasn't until vdev_load was parallelized that any code attempted concurrent access to those fields. Sponsored by: Axcient Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Alan Somers <asomers@gmail.com> Closes #11470		2021-01-26 19:35:59 -08:00
..
avl	cppcheck: remove redundant ASSERTs	2021-01-26 16:12:10 -08:00
icp	Extending FreeBSD UIO Struct	2021-01-20 21:27:30 -08:00
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	cppcheck: integrete cppcheck	2021-01-26 16:12:26 -08:00
spl	Cleanup linux module kbuild files	2020-06-10 09:24:15 -07:00
unicode	Throw const on some strings	2020-10-02 17:44:10 -07:00
zcommon	Linux 5.10 compat: use iov_iter in uio structure	2020-12-18 08:48:26 -08:00
zfs	Parallelize vdev_load	2021-01-26 19:35:59 -08:00
zstd	Optimize locking checks in mempool allocator	2020-11-02 12:10:07 -08:00
.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	FreeBSD: decouple ZFS_DEBUG from kernel debug settings	2020-11-24 09:16:46 -08:00
Makefile.in	cppcheck: integrete cppcheck	2021-01-26 16:12:26 -08:00