When executing user-space applications, Linux keeps its entire kernel memory mapped in page tables
protected from access.
The hardware and software IOMMUs provide I/O address translation and access control on DMA buffers based on I/O page tables
Technologies such as Intel Turbo Boost Technology, Intel Hyper-Threading Technology, integrated power gates, and Next-Generation Intel Virtualization Technology (VT) improved through extended page tables
, allow the system to adapt to a broad range of workloads.
These translations take time that can cause delays in applications that require frequent updates to these page tables
, Wolf says.
Receive Buffer Aggregate (Receiver) (a) Find and reserve a free virtual address range in receiver's address space [O(#fbufs)] (b) Enter shared mappings in receiver's page tables
[O(#pages)] (c) Construct a buffer aggregate from the received list of fbufs [O(#fbufs)]
This is easily accomplished by giving each process a private level-1 page table
(L1PT), which contains two entries for level-2 page tables
The bulk of the book consists of two page tables
for each country, summarizing in ten detailed categories the external debt of these developing countries.
a, c Sharing pages can be achieved either by providing a copy of the page or by having the same entry in the page tables
that point to the shared page.
Providing an interesting and convenient source of raw data, this two volume reference tracks the events of the 1920s in a series of two- page tables
, each devoted to a single week.