Our supported XenServer build environments lack proper atomic
libraries, which makes recent OVS techiques (ovs-rcu, cmap) painfully
slow. This series adds native atomic implementations for i586 and
x86_64 when compiled with GCC. This makes the atomic operations on
older GCC versions as fast as on newer versions.
v3: - Elaborated memory_order_acq_rel documentation.
- Relaxed "memory_order be constant" to not try to cover the case
when compiling without inlining, hence removed asserts as well. In
effect memory_order can be a run-time value in this case, but such
compilations are not for performance in the first place.
- Fixed atomic_flag to default to memory_order_seq_cst for GCC4+,
and both new implementations.
Jarno Rajahalme (8):
Fix strict aliasing violations with GCC 4.1 and 4.4.
lib/ovs-atomic: Elaborate memory_order documentation.
lib/ovs-atomic: Require memory_order be constant.
ovs-atomic: Fix GCC4+ atomic_flag.
lib/ovs-atomic-gcc4+: Use 'volatile' to enforce memory access.
tests/test-atomic: Cover more of the atomic API.
lib/ovs-atomic: Native support for x86_64 with GCC.
lib/ovs-atomic: Native support for 32-bit 586 with GCC.
lib/automake.mk | 2 +
lib/ovs-atomic-gcc4+.h | 54 ++---
lib/ovs-atomic-i586.h | 440 +++++++++++++++++++++++++++++++++++++++++
lib/ovs-atomic-x86_64.h | 346 ++++++++++++++++++++++++++++++++
lib/ovs-atomic.h | 63 +++++-
ofproto/connmgr.c | 12 +-
ofproto/ofproto-dpif-sflow.c | 12 +-
ofproto/ofproto-dpif-upcall.c | 7 +-
tests/test-atomic.c | 291 ++++++++++++++++++++++++++-
vswitchd/bridge.c | 11 +-
10 files changed, 1193 insertions(+), 45 deletions(-)
create mode 100644 lib/ovs-atomic-i586.h
create mode 100644 lib/ovs-atomic-x86_64.h
--
1.7.10.4
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