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[Qemu-devel] [PATCH 0/4] Optionally use membarrier system call for RCU


From: Paolo Bonzini
Subject: [Qemu-devel] [PATCH 0/4] Optionally use membarrier system call for RCU
Date: Fri, 9 Mar 2018 14:29:18 +0100

I didn't have time to check whether it improves performance (not
too likely, since QEMU tends to have pretty long RCU critical
sections), but it cannot hurt either. :)

For microbenchmark results, see patch 4.

Paolo


Paolo Bonzini (4):
  rcutorture: remove synchronize_rcu from readers
  rcu: make memory barriers more explicit
  membarrier: introduce qemu/sys_membarrier.h
  membarrier: add --enable-membarrier

 configure                     | 41 ++++++++++++++++++++++++++++++++++-
 include/qemu/rcu.h            | 16 ++++++++++++--
 include/qemu/sys_membarrier.h | 27 +++++++++++++++++++++++
 tests/rcutorture.c            |  4 ---
 util/Makefile.objs            |  1 +
 util/rcu.c                    | 15 +++++++++----
 util/sys_membarrier.c         | 50 +++++++++++++++++++++++++++++++++++++++++++
 7 files changed, 143 insertions(+), 11 deletions(-)
 create mode 100644 include/qemu/sys_membarrier.h
 create mode 100644 util/sys_membarrier.c

-- 
2.14.3




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