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runtime: remove nextSampleNoFP from plan9 

Plan 9 can use floating point now.

Change-Id: If721b243daa31853609cb3d2c535d86c106a1ee1
Reviewed-on: https://go-review.googlesource.com/c/go/+/655879
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Keith Randall <khr@google.com>
Reviewed-by: Keith Randall <khr@golang.org>
Auto-Submit: Russ Cox <rsc@golang.org>
This commit is contained in:
Russ Cox 2025-03-07 13:31:01 -05:00 committed by Gopher Robot
parent d037ed62bc
commit 40c953cd46
1 changed files with 0 additions and 21 deletions
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21
src/runtime/malloc.go
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@ -1815,13 +1815,6 @@ func nextSample() int64 {
// Sample immediately. // Sample immediately.
return 0 return 0
} }
if GOOS == "plan9" {
// Plan 9 doesn't support floating point in note handler.
if gp := getg(); gp == gp.m.gsignal {
return nextSampleNoFP()
}
}
return int64(fastexprand(MemProfileRate)) return int64(fastexprand(MemProfileRate))
} }
@ -1855,20 +1848,6 @@ func fastexprand(mean int) int32 {
return int32(qlog*(minusLog2*float64(mean))) + 1 return int32(qlog*(minusLog2*float64(mean))) + 1
} }
// nextSampleNoFP is similar to nextSample, but uses older,
// simpler code to avoid floating point.
func nextSampleNoFP() int64 {
// Set first allocation sample size.
rate := MemProfileRate
if rate > 0x3fffffff { // make 2*rate not overflow
rate = 0x3fffffff
}
if rate != 0 {
return int64(cheaprandn(uint32(2 * rate)))
}
return 0
}
type persistentAlloc struct { type persistentAlloc struct {
base *notInHeap base *notInHeap
off uintptr off uintptr