K 10
svn:author
V 7
delphij
K 8
svn:date
V 27
2014-10-06T17:27:49.798867Z
K 7
svn:log
V 562
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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