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author | pjd <pjd@FreeBSD.org> | 2013-09-05 00:53:01 +0000 |
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committer | pjd <pjd@FreeBSD.org> | 2013-09-05 00:53:01 +0000 |
commit | 58db73786bebc44342321a87e1bf763b4d3d9cfc (patch) | |
tree | 41c7a04f48c55bfa4e25b94a532cafe9ad34eead /sys/cddl/contrib/opensolaris/uts | |
parent | 15d287f52f53dd1ba33afd4c7c8b0ee07a9c6099 (diff) | |
download | FreeBSD-src-58db73786bebc44342321a87e1bf763b4d3d9cfc.zip FreeBSD-src-58db73786bebc44342321a87e1bf763b4d3d9cfc.tar.gz |
Add sysctl/tunables for various metaslab variables.
Diffstat (limited to 'sys/cddl/contrib/opensolaris/uts')
-rw-r--r-- | sys/cddl/contrib/opensolaris/uts/common/fs/zfs/metaslab.c | 37 |
1 files changed, 33 insertions, 4 deletions
diff --git a/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/metaslab.c b/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/metaslab.c index f2f7139..50a1e82 100644 --- a/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/metaslab.c +++ b/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/metaslab.c @@ -32,6 +32,9 @@ #include <sys/vdev_impl.h> #include <sys/zio.h> +SYSCTL_DECL(_vfs_zfs); +SYSCTL_NODE(_vfs_zfs, OID_AUTO, metaslab, CTLFLAG_RW, 0, "ZFS metaslab"); + /* * Allow allocations to switch to gang blocks quickly. We do this to * avoid having to load lots of space_maps in a given txg. There are, @@ -46,6 +49,10 @@ uint64_t metaslab_aliquot = 512ULL << 10; uint64_t metaslab_gang_bang = SPA_MAXBLOCKSIZE + 1; /* force gang blocks */ +TUNABLE_QUAD("vfs.zfs.metaslab.gang_bang", &metaslab_gang_bang); +SYSCTL_QUAD(_vfs_zfs_metaslab, OID_AUTO, gang_bang, CTLFLAG_RWTUN, + &metaslab_gang_bang, 0, + "Force gang block allocation for blocks larger than or equal to this value"); /* * The in-core space map representation is more compact than its on-disk form. @@ -61,17 +68,19 @@ int zfs_condense_pct = 200; * allocations on that device. */ int zfs_mg_alloc_failures = 0; - -SYSCTL_DECL(_vfs_zfs); -SYSCTL_INT(_vfs_zfs, OID_AUTO, mg_alloc_failures, CTLFLAG_RDTUN, +TUNABLE_INT("vfs.zfs.mg_alloc_failures", &zfs_mg_alloc_failures); +SYSCTL_INT(_vfs_zfs, OID_AUTO, mg_alloc_failures, CTLFLAG_RWTUN, &zfs_mg_alloc_failures, 0, "Number of allowed allocation failures per vdev"); -TUNABLE_INT("vfs.zfs.mg_alloc_failures", &zfs_mg_alloc_failures); /* * Metaslab debugging: when set, keeps all space maps in core to verify frees. */ static int metaslab_debug = 0; +TUNABLE_INT("vfs.zfs.metaslab.debug", &metaslab_debug); +SYSCTL_INT(_vfs_zfs_metaslab, OID_AUTO, debug, CTLFLAG_RWTUN, &metaslab_debug, + 0, + "Metaslab debugging: when set, keeps all space maps in core to verify frees"); /* * Minimum size which forces the dynamic allocator to change @@ -80,6 +89,11 @@ static int metaslab_debug = 0; * aggressive strategy (i.e search by size rather than offset). */ uint64_t metaslab_df_alloc_threshold = SPA_MAXBLOCKSIZE; +TUNABLE_QUAD("vfs.zfs.metaslab.df_alloc_threshold", + &metaslab_df_alloc_threshold); +SYSCTL_QUAD(_vfs_zfs_metaslab, OID_AUTO, df_alloc_threshold, CTLFLAG_RWTUN, + &metaslab_df_alloc_threshold, 0, + "Minimum size which forces the dynamic allocator to change it's allocation strategy"); /* * The minimum free space, in percent, which must be available @@ -88,22 +102,37 @@ uint64_t metaslab_df_alloc_threshold = SPA_MAXBLOCKSIZE; * switch to using best-fit allocations. */ int metaslab_df_free_pct = 4; +TUNABLE_INT("vfs.zfs.metaslab.df_free_pct", &metaslab_df_free_pct); +SYSCTL_INT(_vfs_zfs_metaslab, OID_AUTO, df_free_pct, CTLFLAG_RWTUN, + &metaslab_df_free_pct, 0, + "The minimum free space, in percent, which must be available in a space map to continue allocations in a first-fit fashion"); /* * A metaslab is considered "free" if it contains a contiguous * segment which is greater than metaslab_min_alloc_size. */ uint64_t metaslab_min_alloc_size = DMU_MAX_ACCESS; +TUNABLE_QUAD("vfs.zfs.metaslab.min_alloc_size", + &metaslab_min_alloc_size); +SYSCTL_QUAD(_vfs_zfs_metaslab, OID_AUTO, min_alloc_size, CTLFLAG_RWTUN, + &metaslab_min_alloc_size, 0, + "A metaslab is considered \"free\" if it contains a contiguous segment which is greater than vfs.zfs.metaslab.min_alloc_size"); /* * Max number of space_maps to prefetch. */ int metaslab_prefetch_limit = SPA_DVAS_PER_BP; +TUNABLE_INT("vfs.zfs.metaslab.prefetch_limit", &metaslab_prefetch_limit); +SYSCTL_INT(_vfs_zfs_metaslab, OID_AUTO, prefetch_limit, CTLFLAG_RWTUN, + &metaslab_prefetch_limit, 0, "Maximum number of space_maps to prefetch"); /* * Percentage bonus multiplier for metaslabs that are in the bonus area. */ int metaslab_smo_bonus_pct = 150; +TUNABLE_INT("vfs.zfs.metaslab.smo_bonus_pct", &metaslab_smo_bonus_pct); +SYSCTL_INT(_vfs_zfs_metaslab, OID_AUTO, smo_bonus_pct, CTLFLAG_RWTUN, + &metaslab_smo_bonus_pct, 0, "Maximum number of space_maps to prefetch"); /* * Should we be willing to write data to degraded vdevs? |