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Add JEMALLOC_COLD, and mark some functions cold.

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This hints to the compiler that it should care more about space than CPU (among
other things).  In cases where the compiler lacks profile-guided information,
this can be a substantial space savings.

For now, we mark the mallctl or atexit driven profiling and stats functions that
take up the most space.
This commit is contained in:
David Goldblatt 2020-12-17 12:04:07 -08:00 • committed by David Goldblatt
parent 5d8e70ab26
commit a9fa2defdb
7 changed files with 36 additions and 1 deletions
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12
configure.ac
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@ -914,6 +914,18 @@ if test "x${je_cv_fallthrough}" = "xyes" ; then
JE_CXXFLAGS_ADD([-Wimplicit-fallthrough])
fi
dnl Check for cold attribute support.
JE_CFLAGS_SAVE()
JE_CFLAGS_ADD([-Werror])
JE_CFLAGS_ADD([-herror_on_warning])
JE_COMPILABLE([cold attribute], [],
[__attribute__((__cold__)) void foo();],
[je_cv_cold])
JE_CFLAGS_RESTORE()
if test "x${je_cv_cold}" = "xyes" ; then
AC_DEFINE([JEMALLOC_HAVE_ATTR_COLD], [ ])
fi
dnl Support optional additions to rpath.
AC_ARG_WITH([rpath],
[AS_HELP_STRING([--with-rpath=<rpath>], [Colon-separated rpath (ELF systems only)])],