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runtime: avoid string allocation in printDebuglog

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Either due to a new nowritebarrierrec annotation or a change in escape
analysis, printDebuglog can't be called from sighandler anymore.

Fix this by avoiding a string allocation that's the primary culprit.

Change-Id: Ic84873a453f45852b0443a46597ed3ab8c9443fd
Reviewed-on: https://go-review.googlesource.com/c/go/+/410121
Run-TryBot: Michael Knyszek <mknyszek@google.com>
Reviewed-by: Michael Pratt <mpratt@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
This commit is contained in:
Michael Anthony Knyszek 2022-06-02 21:10:26 +00:00 committed by Michael Knyszek
parent d7941030c9
commit 73587b71a6
1 changed files with 2 additions and 1 deletions
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3
src/runtime/debuglog.go
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@ -777,7 +777,8 @@ func printDebugLog() {
// Logged before runtimeInitTime was set.
pnano = 0
}
print(string(itoaDiv(tmpbuf[:], uint64(pnano), 9)))
pnanoBytes := itoaDiv(tmpbuf[:], uint64(pnano), 9)
print(slicebytetostringtmp((*byte)(noescape(unsafe.Pointer(&pnanoBytes[0]))), len(pnanoBytes)))
print(" P ", p, "] ")
for i := 0; s.begin < s.end; i++ {