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runtime: enable vDSO support for s390x architecture

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This change adds support for vDSO for s390x architecture. This avoids the use of system calls in nanotime and walltime and accelerates them by factor 4-5.

Benchmarks:
100,000,000 x time.Now():
syscall fallback	13923ms		139.23 ns/op
vDSO enabled		2640ms	 	26.40 ns/op

Change-Id: Ic679fe31048379e59ccf83b400140f13c9d49696
GitHub-Last-Rev: 8f6e918a45
GitHub-Pull-Request: golang/go#49717
Reviewed-on: https://go-review.googlesource.com/c/go/+/365995
Run-TryBot: Paul Murphy <murp@ibm.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: David Chase <drchase@google.com>
Reviewed-by: Paul Murphy <murp@ibm.com>
Reviewed-by: Michael Knyszek <mknyszek@google.com>
Reviewed-by: Jonathan Albrecht <jonathan.albrecht@ibm.com>
Reviewed-by: Heschi Kreinick <heschi@google.com>
Reviewed-by: Bill O'Farrell <billotosyr@gmail.com>
This commit is contained in:
Axel Busch 2022-05-10 13:48:19 +00:00 • committed by Paul Murphy
parent 7b314d27ce
commit 636c5f0208
7 changed files with 198 additions and 22 deletions
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2
src/runtime/signal_unix.go
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@ -397,7 +397,7 @@ func preemptM(mp *m) {
//go:nosplit
func sigFetchG(c *sigctxt) *g {
switch GOARCH {
case "arm", "arm64", "ppc64", "ppc64le", "riscv64":
case "arm", "arm64", "ppc64", "ppc64le", "riscv64", "s390x":
if !iscgo && inVDSOPage(c.sigpc()) {
// When using cgo, we save the g on TLS and load it from there
// in sigtramp. Just use that.