From 8d2c0a593bdefd220be0822fb70de6b8d3bfd39d Mon Sep 17 00:00:00 2001 From: Adhemerval Zanella Date: Fri, 7 Nov 2014 12:25:32 -0500 Subject: powerpc: Add the lock elision using HTM This patch adds support for lock elision using ISA 2.07 hardware transactional memory instructions for pthread_mutex primitives. Similar to s390 version, the for elision logic defined in 'force-elision.h' is only enabled if ENABLE_LOCK_ELISION is defined. Also, the lock elision code should be able to be built even with a compiler that does not provide HTM support with builtins. However I have noted the performance is sub-optimal due scheduling pressures. --- sysdeps/unix/sysv/linux/powerpc/elision-conf.h | 42 ++++++++++++++++++++++++++ 1 file changed, 42 insertions(+) create mode 100644 sysdeps/unix/sysv/linux/powerpc/elision-conf.h (limited to 'sysdeps/unix/sysv/linux/powerpc/elision-conf.h') diff --git a/sysdeps/unix/sysv/linux/powerpc/elision-conf.h b/sysdeps/unix/sysv/linux/powerpc/elision-conf.h new file mode 100644 index 0000000000..fc9994de97 --- /dev/null +++ b/sysdeps/unix/sysv/linux/powerpc/elision-conf.h @@ -0,0 +1,42 @@ +/* elision-conf.h: Lock elision tunable parameters. + Copyright (C) 2014 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 + . */ + +#ifndef _ELISION_CONF_H +#define _ELISION_CONF_H 1 + +#include +#include + +/* Should make sure there is no false sharing on this. */ +struct elision_config +{ + int skip_lock_busy; + int skip_lock_internal_abort; + int skip_lock_out_of_tbegin_retries; + int try_tbegin; + int skip_trylock_internal_abort; +} __attribute__ ((__aligned__ (128))); + +extern struct elision_config __elision_aconf attribute_hidden; + +extern int __pthread_force_elision attribute_hidden; + +/* Tell the test suite to test elision for this architecture. */ +#define HAVE_ELISION 1 + +#endif -- cgit 1.4.1