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
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os	FreeBSD: fix HEAD build, conditionally remove FDSYNC defines	2021-01-23 15:39:55 -08:00
sys	Parallelize vdev_load	2021-01-26 19:35:59 -08:00
.gitignore	OpenZFS restructuring - move platform specific sources	2019-09-06 11:26:26 -07:00
cityhash.h	Compile cityhash code into libzfs	2020-03-27 09:11:22 -07:00
libnvpair.h	Add JSON output support to channel programs	2018-03-19 12:40:58 -07:00
libuutil_common.h	Support custom build directories and move includes	2010-09-08 12:38:56 -07:00
libuutil_impl.h	Support custom build directories and move includes	2010-09-08 12:38:56 -07:00
libuutil.h	Correct cppcheck errors	2017-09-19 12:17:29 -07:00
libzfs_core.h	zfs label bootenv should store data as nvlist	2020-09-15 15:42:27 -07:00
libzfs_impl.h	Add 'zfs rename -u' to rename without remounting	2020-09-01 16:14:16 -07:00
libzfs.h	zpool: correctly align columns with -p	2020-11-16 09:26:20 -08:00
libzfsbootenv.h	zfs label bootenv should store data as nvlist	2020-09-15 15:42:27 -07:00
libzutil.h	Add prototypes	2020-06-18 12:21:32 -07:00
Makefile.am	zfs label bootenv should store data as nvlist	2020-09-15 15:42:27 -07:00
thread_pool.h	Add libtpool (thread pools)	2017-08-09 15:31:08 -07:00
zfeature_common.h	Distributed Spare (dRAID) Feature	2020-11-13 13:51:51 -08:00
zfs_comutil.h	Fix "zpool add -n" for dedup, special and log devices	2020-01-06 15:40:06 -08:00
zfs_deleg.h	Remove code for zfs remap	2019-06-24 16:44:01 -07:00
zfs_fletcher.h	Add AVX512BW variant of fletcher	2019-10-30 12:26:14 -07:00
zfs_namecheck.h	Implement bookmark copying	2020-02-11 13:19:12 -08:00
zfs_prop.h	Add zfs module feature and property info to sysfs	2018-09-02 12:09:53 -07:00