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Support --with-lg-page values larger than system page size.

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All mappings continue to be PAGE-aligned, even if the system page size
is smaller.  This change is primarily intended to provide a mechanism
for supporting multiple page sizes with the same binary; smaller page
sizes work better in conjunction with jemalloc's design.

This resolves #467.
This commit is contained in:
Jason Evans
2017-04-16 16:23:32 -07:00
parent 45f087eb03
commit da4cff0279
8 changed files with 155 additions and 111 deletions
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9
INSTALL
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@@ -219,9 +219,12 @@ any of the following arguments (not a definitive list) to 'configure':
documentation.
--with-lg-page=<lg-page>
Specify the base 2 log of the system page size. This option is only useful
when cross compiling, since the configure script automatically determines
the host's page size by default.
Specify the base 2 log of the allocator page size, which must in turn be at
least as large as the system page size. By default the configure script
determines the host's page size and sets the allocator page size equal to
the system page size, so this option need not be specified unless the
system page size may change between configuration and execution, e.g. when
cross compiling.
--with-lg-page-sizes=<lg-page-sizes>
Specify the comma-separated base 2 logs of the page sizes to support. This