Stowage/go
2
0
Fork 0
mirror of https://github.com/golang/go.git synced 2025-12-08 06:10:04 +00:00
Code Issues Projects Releases Packages Wiki Activity

runtime: add a benchmark of FPCallers

Browse source 
This allows comparing frame pointer unwinding against the default
unwinder as shown below.

goos: linux
goarch: amd64
pkg: runtime
cpu: Intel(R) Xeon(R) Platinum 8375C CPU @ 2.90GHz
                    │ callers.txt │
                    │   sec/op    │
Callers/cached-32     1.254µ ± 0%
FPCallers/cached-32   24.99n ± 0%

For #16638

Change-Id: I4dd05f82254726152ef4a5d5beceab33641e9d2b
Reviewed-on: https://go-review.googlesource.com/c/go/+/475795
TryBot-Result: Gopher Robot <gobot@golang.org>
Run-TryBot: Felix Geisendörfer <felix.geisendoerfer@datadoghq.com>
Reviewed-by: Michael Knyszek <mknyszek@google.com>
Reviewed-by: Cherry Mui <cherryyz@google.com>
This commit is contained in:
Felix Geisendörfer 2023-03-13 09:56:45 +01:00 • committed by Michael Pratt
parent 3dd221a94d
commit 25f9af6661
2 changed files with 26 additions and 0 deletions
Download patch file Download diff file Expand all files Collapse all files

6
src/runtime/export_test.go
View file

@ -1727,3 +1727,9 @@ func FrameStartLine(f *Frame) int {
func PersistentAlloc(n uintptr) unsafe.Pointer {
return persistentalloc(n, 0, &memstats.other_sys)
}
// FPCallers works like Callers and uses frame pointer unwinding to populate
// pcBuf with the return addresses of the physical frames on the stack.
func FPCallers(skip int, pcBuf []uintptr) int {
return fpTracebackPCs(unsafe.Pointer(getcallerfp()), skip, pcBuf)
}