Ned Bass 4d3fc57112 Reduce stack usage for recursive dbuf_hold_impl() ... This commit preserves the recursive function dbuf_hold_impl() but moves the local variables and function arguments to the heap to minimize the stack frame size. Enough space is initially allocated on the stack for 20 levels of recursion. This technique was based on commit 34229a2f2a which reduced stack usage of traverse_visitbp(). dbuf_hold_impl() is mutually recursive with dbuf_findbp(), but the latter function is also called from other functions. Therefore dbuf_findbp() must contain logic to determine how to call dbuf_hold_impl(). To this end, dbuf_hold_impl() now takes a struct dbuf_hold_impl_data pointer as an argument. If that argument is NULL it calls dbuf_hold_impl() as before, otherwise it calls __debuf_hold_impl() with a single dbuf_hold_impl_data pointer argument. As the name implies, dbuf_hold_impl_data stores the arguments and local variables for dbuf_hold_impl(). Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>		2010-08-02 14:12:31 -07:00
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avl	Update core ZFS code from build 121 to build 141.	2010-05-28 13:45:14 -07:00
nvpair	Update core ZFS code from build 121 to build 141.	2010-05-28 13:45:14 -07:00
unicode	Add unicode library	2009-01-05 12:03:23 -08:00
zcommon	Update core ZFS code from build 121 to build 141.	2010-05-28 13:45:14 -07:00
zfs	Reduce stack usage for recursive dbuf_hold_impl()	2010-08-02 14:12:31 -07:00
.gitignore	Add .gitignore files to exclude build products	2010-01-08 11:35:17 -08:00