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With TLE enabled, the adapt count variable update incurs an 8% overhead before entering the critical section of an elided mutex. Instead, if it is done right after leaving the critical section, this serialization can be avoided. This alters the existing behavior of __lll_trylock_elision as it will only decrement the adapt_count if it successfully acquires the lock. * sysdeps/unix/sysv/linux/powerpc/elision-lock.c (__lll_lock_elision): Remove adapt_count decrement... * sysdeps/unix/sysv/linux/powerpc/elision-trylock.c (__lll_trylock_elision): Likewise. * sysdeps/unix/sysv/linux/powerpc/elision-unlock.c (__lll_unlock_elision): ... to here. And utilize new adapt_count parameter. * sysdeps/unix/sysv/linux/powerpc/lowlevellock.h (__lll_unlock_elision): Update to include adapt_count parameter. (lll_unlock_elision): Pass pointer to adapt_count variable.
49 lines
1.8 KiB
C
49 lines
1.8 KiB
C
/* PowerPC specific lock definitions.
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Copyright (C) 2015 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<http://www.gnu.org/licenses/>. */
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#ifndef _POWERPC_LOWLEVELLOCK_H
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#define _POWERPC_LOWLEVELLOCK_H 1
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#include <sysdeps/nptl/lowlevellock.h>
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/* Transactional lock elision definitions. */
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extern int __lll_timedlock_elision
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(int *futex, short *adapt_count, const struct timespec *timeout, int private)
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attribute_hidden;
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#define lll_timedlock_elision(futex, adapt_count, timeout, private) \
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__lll_timedlock_elision(&(futex), &(adapt_count), timeout, private)
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extern int __lll_lock_elision (int *futex, short *adapt_count, int private)
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attribute_hidden;
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extern int __lll_unlock_elision (int *lock, short *adapt_count, int private)
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attribute_hidden;
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extern int __lll_trylock_elision(int *lock, short *adapt_count)
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attribute_hidden;
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#define lll_lock_elision(futex, adapt_count, private) \
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__lll_lock_elision (&(futex), &(adapt_count), private)
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#define lll_unlock_elision(futex, adapt_count, private) \
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__lll_unlock_elision (&(futex), &(adapt_count), private)
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#define lll_trylock_elision(futex, adapt_count) \
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__lll_trylock_elision (&(futex), &(adapt_count))
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#endif
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