Notice that vm.pmap.pde.promotions increased by 31. This means that 31
superpage mappings were created by promotion from small page mappings.
thank you. i looked at .mappings as it seemed logical for me that is shows
total.
In contrast, vm.pmap.pde.mappings counts superpage mappings that are created
directly and not by promotion from small page mappings. For example, if a
large executable, such as gcc, is resident in memory, the text segment will
be pre-mapped using superpage mappings, avoiding soft fault and promotion
overhead. Similarly, mmap(..., MAP_PREFAULT_READ) on a large, memory
resident file may pre-map the file using superpage mappings.
your options are not described in mmap manpage nor
madvise (MAP_PREFAULT_READ).
when can i find the up to date manpage or description?
is it possible to force VM subsystem to operate on superpages when
possible - i mean swapping in 2MB chunks?
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