Add tunable vfs.zfs.space_map_blksz for space map's maximum block size.
MFC after: 2 weeks
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svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=273267
@ -37,6 +37,8 @@
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#include <sys/refcount.h>
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#include <sys/refcount.h>
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#include <sys/zfeature.h>
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#include <sys/zfeature.h>
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SYSCTL_DECL(_vfs_zfs);
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/*
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/*
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* The data for a given space map can be kept on blocks of any size.
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* The data for a given space map can be kept on blocks of any size.
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* Larger blocks entail fewer i/o operations, but they also cause the
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* Larger blocks entail fewer i/o operations, but they also cause the
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@ -44,6 +46,8 @@
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* when only a few blocks have changed since the last transaction group.
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* when only a few blocks have changed since the last transaction group.
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*/
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*/
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int space_map_blksz = (1 << 12);
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int space_map_blksz = (1 << 12);
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SYSCTL_INT(_vfs_zfs, OID_AUTO, space_map_blksz, CTLFLAG_RDTUN, &space_map_blksz, 0,
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"Maximum block size for space map. Must be power of 2 and greater than 4096.");
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/*
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/*
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* Load the space map disk into the specified range tree. Segments of maptype
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* Load the space map disk into the specified range tree. Segments of maptype
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