mirror/glibc - mirror of git://sourceware.org/git/glibc.git

	Commit message (Collapse)	Author	Age	Files	Lines
*	powerpc: Fix write-after-destroy in lock elision [BZ #20822]	Tulio Magno Quites Machado Filho	2017-01-03	1	-3/+7
\| \| \| \| \| \|	The update of adapt_count after the release of the lock causes a race condition when thread A unlocks, thread B continues and destroys the mutex, and thread A writes to adapt_count.
*	Update copyright dates with scripts/update-copyrights.	Joseph Myers	2017-01-01	1	-1/+1
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*	powerpc: Enforce compiler barriers on hardware transactions	Tulio Magno Quites Machado Filho	2016-01-08	1	-2/+2
\| \| \| \| \| \| \|	Work around a GCC behavior with hardware transactional memory built-ins. GCC doesn't treat the PowerPC transactional built-ins as compiler barriers, moving instructions past the transaction boundaries and altering their atomicity.
*	Update copyright dates with scripts/update-copyrights.	Joseph Myers	2016-01-04	1	-1/+1
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*	powerpc: Fix usage of elision transient failure adapt param	Paul Murphy	2015-10-27	1	-9/+6
\| \| \| \| \| \| \| \| \| \| \| \| \| \|	The skip_lock_out_of_tbegin_retries adaptive parameter was not being used correctly, nor as described. This prevents a fallback for all users of the lock if a transient abort occurs within the accepted number of retries. [BZ #19174] * sysdeps/powerpc/nptl/elide.h (__elide_lock): Fix usage of .skip_lock_out_of_tbegin_retries. * sysdeps/unix/sysv/linux/powerpc/elision-lock.c (__lll_lock_elision): Likewise, and respect a value of try_tbegin <= 0.
*	powerpc: Optimize lock elision for pthread_mutex_t	Paul Murphy	2015-10-15	1	-1/+0
\| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \|	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.
*	powerpc: Revert to default atomic ops in elision code	Paul E. Murphy	2015-08-26	1	-21/+0
\| \| \| \| \| \| \| \| \| \| \|	Power ISA 2.07B section B.5.5 relaxed the barrier requirement around a TLE enabled lock. It is now identical to a traditional lock. 2015-08-26 Paul E. Murphy <murphyp@linux.vnet.ibm.com> * sysdeps/unix/sysv/linux/powerpc/elision-lock.c (__arch_compare_and_exchange_val_32_acq): Remove and use common definition. ISA 2.07B no longer requires full sync.
*	powerpc: Fix Copyright dates and CL entry	Adhemerval Zanella	2015-01-12	1	-1/+1
\| \| \| \| \|	This patch fixes the copyright dates from files created by commit 8d2c0a5, 4b45943, and 56cf276.
*	powerpc: Add the lock elision using HTM	Adhemerval Zanella	2015-01-12	1	-0/+107
	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.