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/freebsd-10.3-release/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/ | ||
H A D | dsl_scan.c | diff 272665 Mon Oct 06 17:41:07 MDT 2014 delphij MFC r271532: MFV r271515: Add a new tunable/sysctl, vfs.zfs.free_max_blocks, which can be used to limit how many blocks can be free'ed before a new transaction group is created. The default is no limit (infinite), but we should probably have a lower default, e.g. 100,000. With this limit, we can guard against the case where ZFS could run out of memory when destroying large numbers of blocks in a single transaction group, as the entire DDT needs to be brought into memory. Illumos issue: 5138 add tunable for maximum number of blocks freed in one txg |
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