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[Qemu-devel] [PATCH v2 0/3] atomics: fix RCU perf. regression + update d

From: Emilio G. Cota
Subject: [Qemu-devel] [PATCH v2 0/3] atomics: fix RCU perf. regression + update documentation
Date: Tue, 24 May 2016 16:06:11 -0400

v1: https://lists.gnu.org/archive/html/qemu-devel/2016-05/msg03661.html

Patch 1 hasn't changed from v1 (where it was patch 2 though).

Patches 2 and 3 fix a not-so-small-after-all RCU performance regression
we introduced when transitioning to __atomic primitives. I got
an arm64 machine to test today and a workload that issues a lot of
atomic_read_rcu's, such as a 100%-lookup qht-bench test,
can gain ~12% in performance. [ in v1's 0/2 message I mentioned rcutorture;
It turns out it's not as dependent on atomic_read_rcu as I thought,
so it's not a good benchmark to measure this effect. ]



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