Lines Matching refs:memory

10  (*) What is high memory?
25 High memory (highmem) is used when the size of physical memory approaches or
26 exceeds the maximum size of virtual memory.  At that point it becomes
27 impossible for the kernel to keep all of the available physical memory mapped
29 the pieces of physical memory that it wants to access.
31 The part of (physical) memory not covered by a permanent mapping is what we
37 kernel entry/exit.  This means the available virtual memory space (4GiB on
51 This means that the kernel can at most map 1GiB of physical memory at any one
53 temporary maps to access the rest of the physical memory - the actual direct
92 wants to access the contents of a page that might be allocated from high memory
152      page-frames in that memory...