Differential D18767 Diff 52821 head/sys/kern/kern_malloc.c

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head/sys/kern/kern_malloc.c

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if (vm_kmem_size_scale < 1)		if (vm_kmem_size_scale < 1)
vm_kmem_size_scale = VM_KMEM_SIZE_SCALE;		vm_kmem_size_scale = VM_KMEM_SIZE_SCALE;

/*		/*
* Check if we should use defaults for the "vm_kmem_size"		* Check if we should use defaults for the "vm_kmem_size"
* variable:		* variable:
*/		*/
if (vm_kmem_size == 0) {		if (vm_kmem_size == 0) {
vm_kmem_size = (mem_size / vm_kmem_size_scale) * PAGE_SIZE;		vm_kmem_size = mem_size / vm_kmem_size_scale;
		vm_kmem_size = vm_kmem_size * PAGE_SIZE < vm_kmem_size ?
		vm_kmem_size_max : vm_kmem_size * PAGE_SIZE;
if (vm_kmem_size_min > 0 && vm_kmem_size < vm_kmem_size_min)		if (vm_kmem_size_min > 0 && vm_kmem_size < vm_kmem_size_min)
vm_kmem_size = vm_kmem_size_min;		vm_kmem_size = vm_kmem_size_min;
if (vm_kmem_size_max > 0 && vm_kmem_size >= vm_kmem_size_max)		if (vm_kmem_size_max > 0 && vm_kmem_size >= vm_kmem_size_max)
vm_kmem_size = vm_kmem_size_max;		vm_kmem_size = vm_kmem_size_max;
}		}
		if (vm_kmem_size == 0)
		panic("Tune VM_KMEM_SIZE_* for the platform");

/*		/*
* The amount of KVA space that is preallocated to the		* The amount of KVA space that is preallocated to the
* kmem arena can be set statically at compile-time or manually		* kmem arena can be set statically at compile-time or manually
* through the kernel environment. However, it is still limited to		* through the kernel environment. However, it is still limited to
* twice the physical memory size, which has been sufficient to handle		* twice the physical memory size, which has been sufficient to handle
* the most severe cases of external fragmentation in the kmem arena.		* the most severe cases of external fragmentation in the kmem arena.
*/		*/
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