Add support for partial segment remapping, where non-relinked binaries
can try to take advantage of libhugetlbfs' segment remapping code. By
LD_PRELOAD'ing the library and specifying the __executable_start address
in the HUGETLB_FORCE_REMAP variable, the library mimics the behavior it
would have if the binary were relinked with our linker scripts.
eh? As a user, would does this do? It lets me skip the linking step?
Does this mean I can override the .bss segment being loaded for programs
and push the segment to a specific place?
A few caveats: this is only useful for binaries with already *very*
large segments, especially on power. We can only really use this partial
remapping algorithm if the segment size is larger than the granularity
at which hugepages can be used. This is because we have to be very
careful not to reduce the available address space or to violate any
contiguity rules. Given power's restriction of one page-size per 256M
area, this requires very large segments. x86 and x86_64 are not so
seriously impacted, as a several-MB large array is sufficient to allow
the remapping to occur.
This feature is mutually exclusive to MINIMAL_COPY, because we are
PRELOAD'd and so do not know what may or may not be uninitialized
anymore.
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