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Implement cache index randomization for large allocations.

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Extract szad size quantization into {extent,run}_quantize(), and .
quantize szad run sizes to the union of valid small region run sizes and
large run sizes.

Refactor iteration in arena_run_first_fit() to use
run_quantize{,_first,_next(), and add support for padded large runs.

For large allocations that have no specified alignment constraints,
compute a pseudo-random offset from the beginning of the first backing
page that is a multiple of the cache line size.  Under typical
configurations with 4-KiB pages and 64-byte cache lines this results in
a uniform distribution among 64 page boundary offsets.

Add the --disable-cache-oblivious option, primarily intended for
performance testing.

This resolves #13.
This commit is contained in:
Jason Evans
2015-05-04 09:58:36 -07:00
parent 6bb54cb9da
commit 8a03cf039c
10 changed files with 280 additions and 74 deletions
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18
configure.ac
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@@ -952,6 +952,23 @@ if test "x$enable_xmalloc" = "x1" ; then
fi
AC_SUBST([enable_xmalloc])
dnl Support cache-oblivious allocation alignment by default.
AC_ARG_ENABLE([cache-oblivious],
[AS_HELP_STRING([--disable-cache-oblivious],
[Disable support for cache-oblivious allocation alignment])],
[if test "x$enable_cache_oblivious" = "xno" ; then
enable_cache_oblivious="0"
else
enable_cache_oblivious="1"
fi
],
[enable_cache_oblivious="1"]
)
if test "x$enable_cache_oblivious" = "x1" ; then
AC_DEFINE([JEMALLOC_CACHE_OBLIVIOUS], [ ])
fi
AC_SUBST([enable_cache_oblivious])
dnl ============================================================================
dnl Check for __builtin_ffsl(), then ffsl(3), and fail if neither are found.
dnl One of those two functions should (theoretically) exist on all platforms
@@ -1663,4 +1680,5 @@ AC_MSG_RESULT([xmalloc : ${enable_xmalloc}])
AC_MSG_RESULT([munmap : ${enable_munmap}])
AC_MSG_RESULT([lazy_lock : ${enable_lazy_lock}])
AC_MSG_RESULT([tls : ${enable_tls}])
AC_MSG_RESULT([cache-oblivious : ${enable_cache_oblivious}])
AC_MSG_RESULT([===============================================================================])