Attachment 13742 Details for Bug 26006 – file.diff

[patch] file.diff

file.diff (text/plain), 1.26 KB, created by Robert.Drehmel on 2001-03-22 20:30:00 UTC

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Creator: Robert.Drehmel

Created: 2001-03-22 20:30:00 UTC

Size: 1.26 KB

patch

obsolete

>Index: zone.9
>===================================================================
>RCS file: /home/ncvs/src/share/man/man9/zone.9,v
>retrieving revision 1.3
>diff -r1.3 zone.9
>63,73c63,73
>< The zone allocator stores state information inside the items proper,
>< so structures that will be managed by the zone allocator must reserve
>< two pointers at the very beginning for internal use by the zone
>< allocator, as follows:
>< .Bd -literal
>< struct my_item {
><         struct my_item  *z_rsvd1;
><         struct my_item  *z_rsvd2;
><         /* rest of structure */
>< };
>< .Ed
>---
>> While an item is not in use, the first sizeof(void *) bytes are used
>> for a pointer to another available item.  When allocated, all of the 
>> item's space is available, except with
>> .Dv INVARIANTS
>> defined, where the second sizeof(void *) bytes are used for sanity
>> checks, and we would get a panic trying to free the item if those bytes
>> were somehow changed to
>> .Dv ZENTRY_FREE .
>> .Pp
>> A similar algorithm is further described in Donald Knuth's `The Art of
>> Computer Programming' volume 1, starting at page 254 (section 2.2.3).
>191c191,193
>< .An Dag-Erling Co\(:idan Sm\(/orgrav Aq des@FreeBSD.org .
>---
>> .An Dag-Erling Co\(:idan Sm\(/orgrav Aq des@FreeBSD.org
>> and modified by
>> .An Robert Drehmel .

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