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Replace --disable-munmap with opt.munmap.

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Control use of munmap(2) via a run-time option rather than a
compile-time option (with the same per platform default).  The old
behavior of --disable-munmap can be achieved with
--with-malloc-conf=munmap:false.

This partially resolves #580.
This commit is contained in:
Jason Evans 2017-04-24 17:28:55 -07:00
parent e2cc6280ed
commit c67c3e4a63
16 changed files with 77 additions and 85 deletions
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9
INSTALL
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@ -128,15 +128,6 @@ any of the following arguments (not a definitive list) to 'configure':
Statically link against the specified libunwind.a rather than dynamically
linking with -lunwind.
--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 [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
"opt.zero" option documentation for usage details.