Emilio G. Cota ab569f5cde atomics: do not emit consume barrier for atomic_rcu_read ... Currently we emit a consume-load in atomic_rcu_read. Because of limitations in current compilers, this is overkill for non-Alpha hosts and it is only useful to make Thread Sanitizer work. This patch leaves the consume-load in atomic_rcu_read when compiling with Thread Sanitizer enabled, and resorts to a relaxed load + smp_read_barrier_depends otherwise. On an RMO host architecture, such as aarch64, the performance improvement of this change is easily measurable. For instance, qht-bench performs an atomic_rcu_read on every lookup. Performance before and after applying this patch: $ tests/qht-bench -d 5 -n 1 Before: 9.78 MT/s After: 10.96 MT/s Backports commit 15487aa132109891482f79d78a30d6cfd465a391 from qemu		2018-02-24 03:28:11 -05:00
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crypto	Drop unused crypto source files	2018-02-17 15:23:57 -05:00
exec	memory: Remove code for mr->may_overlap	2018-02-24 02:55:25 -05:00
fpu	fpu: Remove use of int_fast16_t in conversions to int16	2018-02-20 16:54:04 -05:00
hw	hw: clean up hw/hw.h includes	2018-02-24 02:46:41 -05:00
qapi	qapi: Change visit_type_FOO() to no longer return partial objects	2018-02-23 19:53:17 -05:00
qemu	atomics: do not emit consume barrier for atomic_rcu_read	2018-02-24 03:28:11 -05:00
qom	cpu: move exec-all.h inclusion out of cpu.h	2018-02-24 02:39:08 -05:00
sysemu	accel: make configure_accelerator return void	2018-02-24 00:31:28 -05:00
config.h	import	2015-08-21 15:04:50 +08:00
elf.h	fix merge conflicts	2017-03-10 21:04:33 +08:00
glib_compat.h	glib_compat: backport hashtable iterator interfaces	2018-02-21 13:18:44 -05:00
qemu-common.h	qemu-common: push cpu.h inclusion out of qemu-common.h	2018-02-24 01:50:56 -05:00