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- Move the computation of pflags out of the page allocation loop in

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kmem_malloc()
- zero fill pages if PG_ZERO bit is not set after allocation in kmem_malloc()

Suggested by: alc, jake
This commit is contained in:
Jeff Roberson 2002-06-19 23:49:57 +00:00
parent 2eb7b21b00
commit 1e081f889b
1 changed files with 21 additions and 17 deletions
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38
sys/vm/vm_kern.c
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@ -312,6 +312,7 @@ kmem_malloc(map, size, flags)
vm_map_entry_t entry;
vm_offset_t addr;
vm_page_t m;
int pflags;
GIANT_REQUIRED;
@ -346,25 +347,26 @@ kmem_malloc(map, size, flags)
vm_map_insert(map, kmem_object, offset, addr, addr + size,
VM_PROT_ALL, VM_PROT_ALL, 0);
/*
* Note: if M_NOWAIT specified alone, allocate from
* interrupt-safe queues only (just the free list). If
* M_USE_RESERVE is also specified, we can also
* allocate from the cache. Neither of the latter two
* flags may be specified from an interrupt since interrupts
* are not allowed to mess with the cache queue.
*/
if ((flags & (M_NOWAIT|M_USE_RESERVE)) == M_NOWAIT)
pflags = VM_ALLOC_INTERRUPT;
else
pflags = VM_ALLOC_SYSTEM;
if (flags & M_ZERO)
pflags |= VM_ALLOC_ZERO;
for (i = 0; i < size; i += PAGE_SIZE) {
int pflags;
/*
* Note: if M_NOWAIT specified alone, allocate from
* interrupt-safe queues only (just the free list). If
* M_USE_RESERVE is also specified, we can also
* allocate from the cache. Neither of the latter two
* flags may be specified from an interrupt since interrupts
* are not allowed to mess with the cache queue.
*/
retry:
if ((flags & (M_NOWAIT|M_USE_RESERVE)) == M_NOWAIT)
pflags = VM_ALLOC_INTERRUPT;
else
pflags = VM_ALLOC_SYSTEM;
if (flags & M_ZERO)
pflags |= VM_ALLOC_ZERO;
m = vm_page_alloc(kmem_object, OFF_TO_IDX(offset + i), pflags);
/*
@ -395,6 +397,8 @@ retry:
vm_map_unlock(map);
goto bad;
}
if (flags & M_ZERO && (m->flags & PG_ZERO) == 0)
vm_page_zero_fill(m);
vm_page_flag_clear(m, PG_ZERO);
m->valid = VM_PAGE_BITS_ALL;
}