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Widen uk_pgoff, the slab header offset field.

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16 bits is only wide enough for kegs with an item size of up to 64KB.
At that size or larger, slab headers are typically offpage because the
item size is a multiple of the page size, but there is no requirement
that this be the case.

We can widen the field without affecting the layout of struct uma_keg
since the removal of uk_slabsize in r315077 left an adjacent hole.

PR:		218911
MFC after:	2 weeks
This commit is contained in:
Mark Johnston 2017-09-13 21:54:37 +00:00
parent e82e50e681
commit 2d54d4bb9f
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=323564
1 changed files with 1 additions and 1 deletions
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sys/vm/uma_int.h
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@ -210,7 +210,7 @@ struct uma_keg {
vm_offset_t uk_kva; /* Zone base KVA */
uma_zone_t uk_slabzone; /* Slab zone backing us, if OFFPAGE */
uint16_t uk_pgoff; /* Offset to uma_slab struct */
uint32_t uk_pgoff; /* Offset to uma_slab struct */
uint16_t uk_ppera; /* pages per allocation from backend */
uint16_t uk_ipers; /* Items per slab */
uint32_t uk_flags; /* Internal flags */