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Add a configure option to enable lock elision and disable by default

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Can be enabled with --enable-lock-elision=yes at configure time.
This commit is contained in:
Andi Kleen 2013-05-16 19:17:14 -07:00
parent 49186d21ef
commit 1717da59ae
8 changed files with 50 additions and 0 deletions
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8
ChangeLog
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@ -1,3 +1,11 @@
2013-07-02 Andi Kleen <ak@linux.intel.com>
* config.h.in (ENABLE_LOCK_ELISION): Add.
* configure.in (--enable-lock-elision): Add option.
* manual/install.texi: Document --enable lock elision.
* configure: Regenerate
* INSTALL: Regenerate.
2013-07-02 H.J. Lu <hongjiu.lu@intel.com>
* sysdeps/i386/i686/multiarch/strcasecmp.S (__strcasecmp): Enable

3
INSTALL
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@ -133,6 +133,9 @@ will be used, and CFLAGS sets optimization options for the compiler.
library. This option hardcodes the newly built C library path in
dynamic tests so that they can be invoked directly.
`--enable-lock-elision=yes'
Enable lock elision for pthread mutexes and rwlocks by default.
`--build=BUILD-SYSTEM'
`--host=HOST-SYSTEM'
These options are for cross-compiling. If you specify both

3
config.h.in
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@ -164,6 +164,9 @@
/* Define if __stack_chk_guard canary should be randomized at program startup. */
#undef ENABLE_STACKGUARD_RANDOMIZE
/* Define if lock elision should be enabled by default. */
#undef ENABLE_LOCK_ELISION
/* Package description. */
#undef PKGVERSION

16
configure vendored
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@ -742,6 +742,7 @@ enable_versioning
enable_oldest_abi
enable_hardcoded_path_in_tests
enable_stackguard_randomization
enable_lock_elision
enable_add_ons
enable_hidden_plt
enable_bind_now
@ -1399,6 +1400,9 @@ Optional Features:
--enable-stackguard-randomization
initialize __stack_chk_guard canary with a random
number at program start
--enable-lock-elision=yes/no
Enable lock elision for pthread mutexes and rwlocks
by default
--enable-add-ons[=DIRS...]
configure and build add-ons in DIR1,DIR2,... search
for add-ons if no parameter given
@ -3472,6 +3476,18 @@ if test "$enable_stackguard_randomize" = yes; then
fi
# Check whether --enable-lock-elision was given.
if test "${enable_lock_elision+set}" = set; then :
enableval=$enable_lock_elision; enable_lock_elision=$enableval
else
enable_lock_elision=no
fi
if test "$enable_lock_elision" = yes ; then
$as_echo "#define ENABLE_LOCK_ELISION 1" >>confdefs.h
fi
# Check whether --enable-add-ons was given.
if test "${enable_add_ons+set}" = set; then :
enableval=$enable_add_ons;

9
configure.in
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@ -184,6 +184,15 @@ if test "$enable_stackguard_randomize" = yes; then
AC_DEFINE(ENABLE_STACKGUARD_RANDOMIZE)
fi
AC_ARG_ENABLE([lock-elision],
AC_HELP_STRING([--enable-lock-elision[=yes/no]],
[Enable lock elision for pthread mutexes and rwlocks by default]),
[enable_lock_elision=$enableval],
[enable_lock_elision=no])
if test "$enable_lock_elision" = yes ; then
AC_DEFINE(ENABLE_LOCK_ELISION)
fi
dnl Generic infrastructure for drop-in additions to libc.
AC_ARG_ENABLE([add-ons],
AC_HELP_STRING([--enable-add-ons@<:@=DIRS...@:>@],

3
manual/install.texi
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@ -160,6 +160,9 @@ By default, dynamic tests are linked to run with the installed C library.
This option hardcodes the newly built C library path in dynamic tests
so that they can be invoked directly.
@item --enable-lock-elision=yes
Enable lock elision for pthread mutexes by default.
@item --build=@var{build-system}
@itemx --host=@var{host-system}
These options are for cross-compiling. If you specify both options and

5
nptl/ChangeLog
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@ -1,3 +1,8 @@
2013-07-02 Andi Kleen <ak@linux.intel.com>
* sysdeps/unix/sysv/linux/x86/elision-conf.c (elision_init):
Check ENABLE_LOCK_ELISION.
2013-07-02 Andi Kleen <ak@linux.intel.com>
* pthread_mutexattr_settype.c (__pthread_mutexattr_settype):

3
nptl/sysdeps/unix/sysv/linux/x86/elision-conf.c
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@ -16,6 +16,7 @@
License along with the GNU C Library; if not, see
<http://www.gnu.org/licenses/>. */
#include "config.h"
#include <pthreadP.h>
#include <init-arch.h>
#include <elision-conf.h>
@ -70,8 +71,10 @@ elision_init (int argc __attribute__ ((unused)),
char **environ)
{
__elision_available = HAS_RTM;
#ifdef ENABLE_LOCK_ELISION
__pthread_force_elision = __libc_enable_secure ? 0 : __elision_available;
__rwlock_rtm_enabled = __libc_enable_secure ? 0 : __elision_available;
#endif
}
#ifdef SHARED