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runtime: normalize sigprof traceback flags 

Each gentraceback call uses a different set of flags. Combine these into
a common variable, only adjusted as necessary.

The effective changes here are:

* cgo traceback now has _TraceJumpStack. This is a no-op since it
  already passes curg.
* libcall traceback now has _TraceJumpStack. This is a behavior change
  and will allow following stack transitions if a libcall is performed on
  g0.
* VDSO traceback drops _TraceTrap. vdsoPC is a return address, so
  _TraceTrap was not necessary.

Change-Id: I351b3cb8dc77df7466795d5fbf2bd8f30bba2d37
Reviewed-on: https://go-review.googlesource.com/c/go/+/358900
Trust: Michael Pratt <mpratt@google.com>
Run-TryBot: Michael Pratt <mpratt@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Cherry Mui <cherryyz@google.com>
This commit is contained in:
Michael Pratt 2021-10-26 16:18:52 -04:00
parent 266626211e
commit 2bc8ed8e9c
1 changed files with 5 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

9
src/runtime/proc.go
View File

@ -4645,6 +4645,7 @@ func sigprof(pc, sp, lr uintptr, gp *g, mp *m) {
getg().m.mallocing++
var stk [maxCPUProfStack]uintptr
flags := uint(_TraceJumpStack)
n := 0
if mp.ncgo > 0 && mp.curg != nil && mp.curg.syscallpc != 0 && mp.curg.syscallsp != 0 {
cgoOff := 0
@ -4662,12 +4663,12 @@ func sigprof(pc, sp, lr uintptr, gp *g, mp *m) {
}
// Collect Go stack that leads to the cgo call.
n = gentraceback(mp.curg.syscallpc, mp.curg.syscallsp, 0, mp.curg, 0, &stk[cgoOff], len(stk)-cgoOff, nil, nil, 0)
n = gentraceback(mp.curg.syscallpc, mp.curg.syscallsp, 0, mp.curg, 0, &stk[cgoOff], len(stk)-cgoOff, nil, nil, flags)
if n > 0 {
n += cgoOff
}
} else {
n = gentraceback(pc, sp, lr, gp, 0, &stk[0], len(stk), nil, nil, _TraceTrap|_TraceJumpStack)
n = gentraceback(pc, sp, lr, gp, 0, &stk[0], len(stk), nil, nil, _TraceTrap|flags)
}
if n <= 0 {
@ -4677,10 +4678,10 @@ func sigprof(pc, sp, lr uintptr, gp *g, mp *m) {
if usesLibcall() && mp.libcallg != 0 && mp.libcallpc != 0 && mp.libcallsp != 0 {
// Libcall, i.e. runtime syscall on windows.
// Collect Go stack that leads to the call.
n = gentraceback(mp.libcallpc, mp.libcallsp, 0, mp.libcallg.ptr(), 0, &stk[0], len(stk), nil, nil, 0)
n = gentraceback(mp.libcallpc, mp.libcallsp, 0, mp.libcallg.ptr(), 0, &stk[0], len(stk), nil, nil, flags)
}
if n == 0 && mp != nil && mp.vdsoSP != 0 {
n = gentraceback(mp.vdsoPC, mp.vdsoSP, 0, gp, 0, &stk[0], len(stk), nil, nil, _TraceTrap|_TraceJumpStack)
n = gentraceback(mp.vdsoPC, mp.vdsoSP, 0, gp, 0, &stk[0], len(stk), nil, nil, flags)
}
if n == 0 {
// If all of the above has failed, account it against abstract "System" or "GC".