| commit | ac8dbe7747971007d58eb39e2e7e615cf9f04493 | [log] [tgz] |
|---|---|---|
| author | Michael Munday <mike.munday@ibm.com> | Tue Jun 04 19:17:41 2019 +0100 |
| committer | Michael Munday <mike.munday@ibm.com> | Thu Jun 06 16:15:43 2019 +0000 |
| tree | 626720b251dd583ead7900a31c3ab221ec84b858 | |
| parent | 53deb812196d857ce8a7c46c1f7c1559bb167630 [diff] |
cmd/compile, runtime: make atomic loads/stores sequentially consistent on s390x The z/Architecture does not guarantee that a load following a store will not be reordered with that store, unless they access the same address. Therefore if we want to ensure the sequential consistency of atomic loads and stores we need to perform serialization operations after atomic stores. We do not need to serialize in the runtime when using StoreRel[ease] and LoadAcq[uire]. The z/Architecture already provides sufficient ordering guarantees for these operations. name old time/op new time/op delta AtomicLoad64-16 0.51ns ± 0% 0.51ns ± 0% ~ (all equal) AtomicStore64-16 0.51ns ± 0% 0.60ns ± 9% +16.47% (p=0.000 n=17+20) AtomicLoad-16 0.51ns ± 0% 0.51ns ± 0% ~ (all equal) AtomicStore-16 0.51ns ± 0% 0.60ns ± 9% +16.50% (p=0.000 n=18+20) Fixes #32428. Change-Id: I88d19a4010c46070e4fff4b41587efe4c628d4d9 Reviewed-on: https://go-review.googlesource.com/c/go/+/180439 Run-TryBot: Michael Munday <mike.munday@ibm.com> TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by: Austin Clements <austin@google.com>
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