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ab569f5cde
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 |
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| .. | ||
| atomic.h | ||
| bitmap.h | ||
| bitops.h | ||
| bswap.h | ||
| compiler.h | ||
| crc32c.h | ||
| cutils.h | ||
| fprintf-fn.h | ||
| host-utils.h | ||
| int128.h | ||
| log.h | ||
| mmap-alloc.h | ||
| module.h | ||
| osdep.h | ||
| queue.h | ||
| range.h | ||
| thread-posix.h | ||
| thread-win32.h | ||
| thread.h | ||
| timer.h | ||
| typedefs.h | ||