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Don't enforce strong ordering of partial slabs. Separating partial slabs
from free slabs is already effective against fragmentation, and sorting
would sometimes cause pathological scalability issues. In addition, store
new slabs (whether free or partial) in LIFO order for better cache usage.
* kern/slab.c (kmem_cache_grow): Insert new slab at the head of the slabs list.
(kmem_cache_alloc_from_slab): Likewise. In addition, don't sort partial slabs.
(kmem_cache_free_to_slab): Likewise.
* kern/slab.h: Remove comment about partial slabs sorting.
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The purpose of this function is to allow kernel code to display the state
of the slab caches in situations where the host_slab_info RPC wouldn't be
available, e.g. before a panic.
* kern/slab.c (slab_info): New function.
* kern/slab.h: Add declaration for slab_info.
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Maksym and I have assigned copyright to the Free Software Foundation.
In addition, restore the original upstream copyrights for correctness.
* kern/list.h: Fix copyright assignment.
* kern/rbtree.c: Likewise.
* kern/rbtree.h: Likewise.
* kern/rbtree_i.h: Likewise.
* kern/slab.c: Likewise.
* kern/slab.h: Likewise.
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As it is intended to completely replace the zone allocator, remove it on
the way. So long to the venerable code !
* Makefrag.am (libkernel_a_SOURCES): Add kern/slab.{c,h}, remove kern/kalloc.c
and kern/zalloc.{c,h}.
* configfrag.ac (SLAB_VERIFY, SLAB_USE_CPU_POOLS): Add defines.
* i386/Makefrag.am (libkernel_a_SOURCES): Remove i386/i386/zalloc.h.
* i386/configfrag.ac (CPU_L1_SHIFT): Remove define.
* include/mach_debug/slab_info.h: New file.
* kern/slab.c: Likewise.
* kern/slab.h: Likewise.
* i386/i386/zalloc.h: Remove file.
* include/mach_debug/zone_info.h: Likewise.
* kern/kalloc.c: Likewise.
* kern/zalloc.c: Likewise.
* kern/zalloc.h: Likewise.
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