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Add the --enable-mremap option.

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Add the --enable-mremap option, and disable the use of mremap(2) by
default, for the same reason that freeing chunks via munmap(2) is
disabled by default on Linux: semi-permanent VM map fragmentation.
This commit is contained in:
Jason Evans 2012-05-09 16:12:00 -07:00
parent 374d26a43b
commit 2e671ffbad
7 changed files with 64 additions and 17 deletions
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src/huge.c
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@ -140,11 +140,11 @@ huge_ralloc(void *ptr, size_t oldsize, size_t size, size_t extra,
*/
copysize = (size < oldsize) ? size : oldsize;
#ifdef JEMALLOC_MREMAP
/*
* Use mremap(2) if this is a huge-->huge reallocation, and neither the
* source nor the destination are in dss.
*/
#ifdef JEMALLOC_MREMAP_FIXED
if (oldsize >= chunksize && (config_dss == false || (chunk_in_dss(ptr)
== false && chunk_in_dss(ret) == false))) {
size_t newsize = huge_salloc(ret);