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jemalloc cpp new/delete bindings

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Adds cpp bindings for jemalloc, along with necessary autoconf settings.
This is mostly to add sized deallocation support, which can't be added
from C directly.  Sized deallocation is ~10% microbench improvement.

* Import ax_cxx_compile_stdcxx.m4 from the autoconf repo, seems like the
  easiest way to get c++14 detection.
* Adds various other changes, like CXXFLAGS, to configure.ac.
* Adds new rules to Makefile.in for src/jemalloc-cpp.cpp, and a basic
  unittest.
* Both new and delete are overridden, to ensure jemalloc is used for
  both.
* TODO future enhancement of avoiding extra PLT thunks for new and
  delete - sdallocx and malloc are publicly exported jemalloc symbols,
  using an alias would link them directly.  Unfortunately, was having
  trouble getting it to play nice with jemalloc's namespace support.

Testing:
Tested gcc 4.8, gcc 5, gcc 5.2, clang 4.0.  Only gcc >= 5 has sized
deallocation support, verified that the rest build correctly.

Tested mac osx and Centos.

Tested --with-jemalloc-prefix and --without-export.

This resolves #202.
This commit is contained in:
Dave Watson 2016-10-23 15:56:30 -07:00 • committed by Jason Evans
parent d4c5aceb7c
commit 2319152d9f
13 changed files with 905 additions and 25 deletions
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8
include/jemalloc/internal/rtree.h
View file

@ -260,7 +260,7 @@ rtree_child_tryread(rtree_elm_t *elm, bool dependent)
/* Double-checked read (first read may be stale). */
child = elm->child;
if (!dependent && !rtree_node_valid(child))
child = atomic_read_p(&elm->pun);
child = (rtree_elm_t *)atomic_read_p(&elm->pun);
assert(!dependent || child != NULL);
return (child);
}
@ -320,8 +320,10 @@ rtree_subtree_tryread(rtree_t *rtree, unsigned level, bool dependent)
/* Double-checked read (first read may be stale). */
subtree = rtree->levels[level].subtree;
if (!dependent && unlikely(!rtree_node_valid(subtree)))
subtree = atomic_read_p(&rtree->levels[level].subtree_pun);
if (!dependent && unlikely(!rtree_node_valid(subtree))) {
subtree = (rtree_elm_t *)atomic_read_p(
&rtree->levels[level].subtree_pun);
}
assert(!dependent || subtree != NULL);
return (subtree);
}