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Add configuration option controlling DSS support

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In many environments, the fallback `sbrk(2)` allocation path is never
used even if the system supports the syscall; if you're at the point
where `mmap(2)` is failing, `sbrk(2)` is unlikely to succeed. Without
changing the default, I've added the ability to disable the usage of DSS
altogether, so that you do not need to pay for the additional code size
and handful of extra runtime branches in such environments.
This commit is contained in:
Kevin Svetlitski 2023-07-06 12:49:10 -07:00 committed by Qi Wang
parent 6816b23862
commit ea5b7bea31
1 changed files with 14 additions and 1 deletions
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15
configure.ac
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@ -1469,6 +1469,18 @@ if test "x$zero_realloc_default_free" = "x1" ; then
AC_DEFINE([JEMALLOC_ZERO_REALLOC_DEFAULT_FREE], [ ], [ ]) AC_DEFINE([JEMALLOC_ZERO_REALLOC_DEFAULT_FREE], [ ], [ ])
fi fi
dnl Support allocation from DSS by default
AC_ARG_ENABLE([dss],
[AS_HELP_STRING([--disable-dss], [Disable usage of sbrk(2)])],
[if test "x$enable_dss" = "xno" ; then
enable_dss="0"
else
enable_dss="1"
fi
],
[enable_dss="1"]
)
dnl Enable allocation from DSS if supported by the OS. dnl Enable allocation from DSS if supported by the OS.
have_dss="1" have_dss="1"
dnl Check whether the BSD/SUSv1 sbrk() exists. If not, disable DSS support. dnl Check whether the BSD/SUSv1 sbrk() exists. If not, disable DSS support.
@ -1482,7 +1494,7 @@ else
have_dss="0" have_dss="0"
fi fi
if test "x$have_dss" = "x1" ; then if test "x$have_dss" = "x1" -a "x$enable_dss" = "x1" ; then
AC_DEFINE([JEMALLOC_DSS], [ ], [ ]) AC_DEFINE([JEMALLOC_DSS], [ ], [ ])
fi fi
@ -2791,4 +2803,5 @@ AC_MSG_RESULT([lazy_lock : ${enable_lazy_lock}])
AC_MSG_RESULT([cache-oblivious : ${enable_cache_oblivious}]) AC_MSG_RESULT([cache-oblivious : ${enable_cache_oblivious}])
AC_MSG_RESULT([pageid : ${enable_pageid}]) AC_MSG_RESULT([pageid : ${enable_pageid}])
AC_MSG_RESULT([cxx : ${enable_cxx}]) AC_MSG_RESULT([cxx : ${enable_cxx}])
AC_MSG_RESULT([dss : ${enable_dss}])
AC_MSG_RESULT([===============================================================================]) AC_MSG_RESULT([===============================================================================])