3 Commits

Author	SHA1	Message	Date
Markus Armbruster	177d9e0da0	Normalize header guard symbol definition. ... We commonly define the header guard symbol without an explicit value. Normalize the exceptions. Done with scripts/clean-header-guards.pl. Signed-off-by: Markus Armbruster <armbru@redhat.com> Message-Id: <20190315145123.28030-8-armbru@redhat.com> Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>	2019-05-13 08:58:55 +02:00
Paolo Bonzini	a40161cbe9	membarrier: add --enable-membarrier ... Actually enable the global memory barriers if supported by the OS. Because only recent versions of Linux include the support, they are disabled by default. Note that it also has to be disabled for QEMU to run under Wine. Before this patch, rcutorture reports 85 ns/read for my machine, after the patch it reports 12.5 ns/read. On the other hand updates go from 50 *micro*seconds to 20 *milli*seconds. Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>	2018-03-12 16:12:47 +01:00
Paolo Bonzini	c8d3877e48	membarrier: introduce qemu/sys_membarrier.h ... This new header file provides heavy-weight "global" memory barriers that enforce memory ordering on each running thread belonging to the current process. For now, use a dummy implementation that issues memory barriers on both sides (matching what QEMU has been doing so far). Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>	2018-03-12 16:12:47 +01:00