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Revert "Experimental configuration option for fast path prefetch from cache_bin"

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This reverts commit f9fae9f1f8.
This commit is contained in:
Slobodan Predolac
2026-02-05 19:18:19 -08:00
committed by Guangli Dai
parent c51abba131
commit d4908fe44a
3 changed files with 0 additions and 41 deletions
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30
configure.ac
View File

@@ -1434,36 +1434,6 @@ if test "x$enable_experimental_smallocx" = "x1" ; then
fi fi
AC_SUBST([enable_experimental_smallocx]) AC_SUBST([enable_experimental_smallocx])
dnl Do not enable fastpath prefetch by default.
AC_ARG_ENABLE([experimental_fp_prefetch],
[AS_HELP_STRING([--enable-experimental-fp-prefetch], [Enable experimental fastpath prefetch])],
[if test "x$enable_experimental_fp_prefetch" = "xno" ; then
enable_experimental_fp_prefetch="0"
else
dnl Check if we have __builtin_prefetch.
JE_CFLAGS_SAVE()
JE_CFLAGS_ADD([-Werror=implicit-function-declaration])
JE_COMPILABLE([builtin prefetch], [], [
void foo(void *p) { __builtin_prefetch(p, 1, 3); }
],
[je_cv_have_builtin_prefetch])
if test "x${je_cv_have_builtin_prefetch}" = "xyes" ; then
enable_experimental_fp_prefetch="1"
else
enable_experimental_fp_prefetch="0"
AC_MSG_ERROR([--enable--experimental-fp-prefetch can only be used when builtin_preftech is available])
fi
JE_CFLAGS_RESTORE()
fi
],
[enable_experimental_fp_prefetch="0"]
)
if test "x$enable_experimental_fp_prefetch" = "x1" ; then
AC_DEFINE([JEMALLOC_EXPERIMENTAL_FASTPATH_PREFETCH], [ ], [ ])
fi
AC_SUBST([enable_experimental_fp_prefetch])
dnl Do not enable profiling by default. dnl Do not enable profiling by default.
AC_ARG_ENABLE([prof], AC_ARG_ENABLE([prof],
[AS_HELP_STRING([--enable-prof], [Enable allocation profiling])], [AS_HELP_STRING([--enable-prof], [Enable allocation profiling])],

5
include/jemalloc/internal/jemalloc_internal_defs.h.in
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@@ -160,11 +160,6 @@
/* JEMALLOC_EXPERIMENTAL_SMALLOCX_API enables experimental smallocx API. */ /* JEMALLOC_EXPERIMENTAL_SMALLOCX_API enables experimental smallocx API. */
#undef JEMALLOC_EXPERIMENTAL_SMALLOCX_API #undef JEMALLOC_EXPERIMENTAL_SMALLOCX_API
/* JEMALLOC_EXPERIMENTAL_FASTPATH_PREFETCH enables prefetch
* on malloc fast path.
*/
#undef JEMALLOC_EXPERIMENTAL_FASTPATH_PREFETCH
/* JEMALLOC_PROF enables allocation profiling. */ /* JEMALLOC_PROF enables allocation profiling. */
#undef JEMALLOC_PROF #undef JEMALLOC_PROF

6
include/jemalloc/internal/jemalloc_internal_inlines_c.h
View File

@@ -374,12 +374,6 @@ imalloc_fastpath(size_t size, void *(fallback_alloc)(size_t)) {
*/ */
ret = cache_bin_alloc_easy(bin, &tcache_success); ret = cache_bin_alloc_easy(bin, &tcache_success);
if (tcache_success) { if (tcache_success) {
#if defined(JEMALLOC_EXPERIMENTAL_FASTPATH_PREFETCH)
cache_bin_sz_t lb = (cache_bin_sz_t)(uintptr_t)bin->stack_head;
if(likely(lb != bin->low_bits_empty)) {
util_prefetch_write_range(*(bin->stack_head), usize);
}
#endif
fastpath_success_finish(tsd, allocated_after, bin, ret); fastpath_success_finish(tsd, allocated_after, bin, ret);
return ret; return ret;
} }