On 10/10/2011 4:28 PM, Wojciech Puchar wrote:
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?
A few minutes ago, I merged the changes to support and document
MAP_PREFAULT_READ into 8-STABLE. So, now it exists in HEAD, 9.0, and
8-STABLE.
Alan
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