Garrett D'Amore wrote:
Oliver Yang wrote:
Hi Guys,
If I use kmem_alloc to alloc a buffer less than 4K, can it ensure
that buffer doesn't cross the page boundary(4k on x86)?
It probably won't cross a page boundary, but the DDI does not
guarantee this.
If you want to provide guarantees like this, use ddi_dma_mem_alloc()
with attributes that specify that page boundaries should not be crossed.
Yes, I knew. On the man page of kmem_alloc, it just ensures memory is at
least double-word aligned, and no other guarantees.
But I really want to know whether current implementation of kmem_alloc
or slab can guarantees this, if the request alloc size is less than 4k.
Since not only one guys told me, that is true.
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