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runtime: move sigprofNonGo

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The sigprofNonGo and sigprofNonGoPC functions are only used on unix-like
platforms. In preparation for unix-specific changes to sigprofNonGo,
move it (plus its close relative) to a unix-specific file.

Updates #35057

Change-Id: I9c814127c58612ea9a9fbd28a992b04ace5c604d
Reviewed-on: https://go-review.googlesource.com/c/go/+/351790
Run-TryBot: Rhys Hiltner <rhys@justin.tv>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Reviewed-by: Michael Pratt <mpratt@google.com>
Trust: David Chase <drchase@google.com>
This commit is contained in:
Rhys Hiltner 2021-09-23 16:46:58 -07:00 committed by Michael Pratt
parent 8cfd8c3db8
commit 5b90958084
2 changed files with 40 additions and 39 deletions
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39
src/runtime/proc.go
View file

@ -4705,45 +4705,6 @@ func sigprof(pc, sp, lr uintptr, gp *g, mp *m) {
getg().m.mallocing--
}
// If the signal handler receives a SIGPROF signal on a non-Go thread,
// it tries to collect a traceback into sigprofCallers.
// sigprofCallersUse is set to non-zero while sigprofCallers holds a traceback.
var sigprofCallers cgoCallers
var sigprofCallersUse uint32
// sigprofNonGo is called if we receive a SIGPROF signal on a non-Go thread,
// and the signal handler collected a stack trace in sigprofCallers.
// When this is called, sigprofCallersUse will be non-zero.
// g is nil, and what we can do is very limited.
//go:nosplit
//go:nowritebarrierrec
func sigprofNonGo() {
if prof.hz != 0 {
n := 0
for n < len(sigprofCallers) && sigprofCallers[n] != 0 {
n++
}
cpuprof.addNonGo(sigprofCallers[:n])
}
atomic.Store(&sigprofCallersUse, 0)
}
// sigprofNonGoPC is called when a profiling signal arrived on a
// non-Go thread and we have a single PC value, not a stack trace.
// g is nil, and what we can do is very limited.
//go:nosplit
//go:nowritebarrierrec
func sigprofNonGoPC(pc uintptr) {
if prof.hz != 0 {
stk := []uintptr{
pc,
abi.FuncPCABIInternal(_ExternalCode) + sys.PCQuantum,
}
cpuprof.addNonGo(stk)
}
}
// setcpuprofilerate sets the CPU profiling rate to hz times per second.
// If hz <= 0, setcpuprofilerate turns off CPU profiling.
func setcpuprofilerate(hz int32) {

40
src/runtime/signal_unix.go
View file

@ -10,6 +10,7 @@ package runtime
import (
"internal/abi"
"runtime/internal/atomic"
"runtime/internal/sys"
"unsafe"
)
@ -469,6 +470,45 @@ func sigtrampgo(sig uint32, info *siginfo, ctx unsafe.Pointer) {
}
}
// If the signal handler receives a SIGPROF signal on a non-Go thread,
// it tries to collect a traceback into sigprofCallers.
// sigprofCallersUse is set to non-zero while sigprofCallers holds a traceback.
var sigprofCallers cgoCallers
var sigprofCallersUse uint32
// sigprofNonGo is called if we receive a SIGPROF signal on a non-Go thread,
// and the signal handler collected a stack trace in sigprofCallers.
// When this is called, sigprofCallersUse will be non-zero.
// g is nil, and what we can do is very limited.
//go:nosplit
//go:nowritebarrierrec
func sigprofNonGo() {
if prof.hz != 0 {
n := 0
for n < len(sigprofCallers) && sigprofCallers[n] != 0 {
n++
}
cpuprof.addNonGo(sigprofCallers[:n])
}
atomic.Store(&sigprofCallersUse, 0)
}
// sigprofNonGoPC is called when a profiling signal arrived on a
// non-Go thread and we have a single PC value, not a stack trace.
// g is nil, and what we can do is very limited.
//go:nosplit
//go:nowritebarrierrec
func sigprofNonGoPC(pc uintptr) {
if prof.hz != 0 {
stk := []uintptr{
pc,
abi.FuncPCABIInternal(_ExternalCode) + sys.PCQuantum,
}
cpuprof.addNonGo(stk)
}
}
// adjustSignalStack adjusts the current stack guard based on the
// stack pointer that is actually in use while handling a signal.
// We do this in case some non-Go code called sigaltstack.