Add glibc.malloc.mxfast tunable

* elf/dl-tunables.list: Add glibc.malloc.mxfast.
* manual/tunables.texi: Document it.
* malloc/malloc.c (do_set_mxfast): New.
(__libc_mallopt): Call it.
* malloc/arena.c: Add mxfast tunable.
* malloc/tst-mxfast.c: New.
* malloc/Makefile: Add it.

Reviewed-by: Carlos O'Donell <carlos@redhat.com>

malloc/Makefile

@@ -39,6 +39,7 @@ tests := mallocbug tst-malloc tst-valloc tst-calloc tst-obstack \
 	 tst-malloc-too-large \
 	 tst-malloc-stats-cancellation \
 	 tst-tcfree1 tst-tcfree2 tst-tcfree3 \
+	 tst-mxfast \
 
 tests-static := \
 	 tst-interpose-static-nothread \
@@ -196,6 +197,8 @@ tst-malloc-usable-static-ENV = $(tst-malloc-usable-ENV)
 tst-malloc-usable-tunables-ENV = GLIBC_TUNABLES=glibc.malloc.check=3
 tst-malloc-usable-static-tunables-ENV = $(tst-malloc-usable-tunables-ENV)
 
+tst-mxfast-ENV = GLIBC_TUNABLES=glibc.malloc.tcache_count=0:glibc.malloc.mxfast=0
+
 ifeq ($(experimental-malloc),yes)
 CPPFLAGS-malloc.c += -DUSE_TCACHE=1
 else

malloc/arena.c

@@ -236,6 +236,7 @@ TUNABLE_CALLBACK_FNDECL (set_tcache_max, size_t)
 TUNABLE_CALLBACK_FNDECL (set_tcache_count, size_t)
 TUNABLE_CALLBACK_FNDECL (set_tcache_unsorted_limit, size_t)
 #endif
+TUNABLE_CALLBACK_FNDECL (set_mxfast, size_t)
 #else
 /* Initialization routine. */
 #include <string.h>
@@ -323,6 +324,7 @@ ptmalloc_init (void)
   TUNABLE_GET (tcache_unsorted_limit, size_t,
 	       TUNABLE_CALLBACK (set_tcache_unsorted_limit));
 # endif
+  TUNABLE_GET (mxfast, size_t, TUNABLE_CALLBACK (set_mxfast));
 #else
   const char *s = NULL;
   if (__glibc_likely (_environ != NULL))

malloc/malloc.c

@@ -5115,6 +5115,19 @@ do_set_tcache_unsorted_limit (size_t value)
 }
 #endif
 
+static inline int
+__always_inline
+do_set_mxfast (size_t value)
+{
+  if (value >= 0 && value <= MAX_FAST_SIZE)
+    {
+      LIBC_PROBE (memory_mallopt_mxfast, 2, value, get_max_fast ());
+      set_max_fast (value);
+      return 1;
+    }
+  return 0;
+}
+
 int
 __libc_mallopt (int param_number, int value)
 {
@@ -5134,13 +5147,7 @@ __libc_mallopt (int param_number, int value)
   switch (param_number)
     {
     case M_MXFAST:
-      if (value >= 0 && value <= MAX_FAST_SIZE)
-        {
-          LIBC_PROBE (memory_mallopt_mxfast, 2, value, get_max_fast ());
-          set_max_fast (value);
-        }
-      else
-        res = 0;
+      do_set_mxfast (value);
       break;
 
     case M_TRIM_THRESHOLD:

malloc/tst-mxfast.c

@@ -0,0 +1,50 @@
+/* Test that glibc.malloc.mxfast tunable works.
+   Copyright (C) 2018, 2019 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <http://www.gnu.org/licenses/>.  */
+
+/* This test verifies that setting the glibc.malloc.mxfast tunable to
+   zero results in free'd blocks being returned to the small bins, not
+   the fast bins.  */
+
+#include <malloc.h>
+#include <assert.h>
+
+int
+do_test(void)
+{
+  struct mallinfo m;
+  char * volatile p1;
+  char * volatile p2;
+
+  /* Arbitrary value; must be in default fastbin range.  */
+  p1 = malloc (3);
+  /* Something large so that p1 isn't a "top block" */
+  p2 = malloc (512);
+  free (p1);
+
+  m = mallinfo();
+
+  /* This will fail if there are any blocks in the fastbins.  */
+  assert (m.smblks == 0);
+
+  /* To keep gcc happy.  */
+  free (p2);
+
+  return 0;
+}
+
+#include <support/test-driver.c>