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Only disable munmap(2) by default on 64-bit Linux.

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This reduces the likelihood of address space exhaustion on 32-bit
systems.

This resolves #350.
This commit is contained in:
Jason Evans
2017-04-17 15:54:53 -07:00
parent c43a83d225
commit a01f993077
2 changed files with 11 additions and 5 deletions
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8
INSTALL
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@@ -161,9 +161,11 @@ any of the following arguments (not a definitive list) to 'configure':
--disable-munmap
Disable virtual memory deallocation via munmap(2); instead keep track of
the virtual memory for later use. munmap() is disabled by default (i.e.
--disable-munmap is implied) on Linux, which has a quirk in its virtual
memory allocation algorithm that causes semi-permanent VM map holes under
normal jemalloc operation.
--disable-munmap is implied) on [64-bit] Linux, which has a quirk in its
virtual memory allocation algorithm that causes semi-permanent VM map holes
under normal jemalloc operation. Although munmap() causes issues on 32-bit
Linux as well, it is not disabled by default due to the practical
possibility of address space exhaustion.
--disable-fill
Disable support for junk/zero filling of memory. See the "opt.junk" and