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Remove long untrue note about storing state information inside free items.

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OKed by:	rwatson, tegge
Approved by:	pjd (mentor)
MFC after:	1 week
This commit is contained in:
Konstantin Belousov 2006-10-02 07:27:00 +00:00
parent 45ea8737bf
commit 7251f55777
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=162946
1 changed files with 1 additions and 19 deletions
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20
share/man/man9/zone.9
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@ -65,27 +65,9 @@ The zone allocator keeps track of which items are in use and which
are not, and provides functions for allocating items from the zone and
for releasing them back (which makes them available for later use).
.Pp
The zone allocator stores state information inside the items proper
while they are not allocated,
so structures that will be managed by the zone allocator
and wish to use the type stable property of zones by leaving some fields
pre-filled between allocations, must reserve
two pointers at the very beginning for internal use by the zone
allocator, as follows:
.Bd -literal -offset indent
struct my_item {
struct my_item *z_rsvd1;
struct my_item *z_rsvd2;
/* rest of structure */
};
.Ed
.Pp
Alternatively they should assume those entries corrupted
after each allocation.
After the first allocation of an item,
it will have been cleared to zeroes, however subsequent allocations
will retain the contents as of the last free, with the exception of the
fields mentioned above.
will retain the contents as of the last free.
.Pp
The
.Fn uma_zcreate