1 ==============================
2 remap_file_pages() system call
3 ==============================
4
5 The remap_file_pages() system call is used to
6 that is, a mapping in which the pages of the f
7 nonsequential order in memory. The advantage o
8 over using repeated calls to mmap(2) is that t
9 require the kernel to create additional VMA (V
10 structures.
11
12 Supporting of nonlinear mapping requires signi
13 code in kernel virtual memory subsystem includ
14 nonlinear mapping work kernel need a way to di
15 entries from entries with file offset (pte_fil
16 PTE for this purpose. PTE flags are scarce res
17 architectures. It would be nice to free up the
18
19 Fortunately, there are not many users of remap
20 It's only known that one enterprise RDBMS impl
21 on 32-bit systems to map files bigger than can
22 virtual address space. This use-case is not cr
23 systems are widely available.
24
25 The syscall is deprecated and replaced it with
26 emulation creates new VMAs instead of nonlinea
27 work slower for rare users of remap_file_pages
28
29 One side effect of emulation (apart from perfo
30 vm.max_map_count limit more easily due to addi
31 DEFAULT_MAX_MAP_COUNT for more details on the
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