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runtime: grow stack more than 2x if the new frame is large

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We might as well grow the stack at least as large as we'll need for
the frame that is calling morestack. It doesn't help with the
lots-of-small-frames case, but it may help a bit with the
few-big-frames case.

Update #18138

Change-Id: I1f49c97706a70e20b30433cbec99a7901528ea52
Reviewed-on: https://go-review.googlesource.com/c/go/+/225800
Run-TryBot: Keith Randall <khr@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Austin Clements <austin@google.com>
This commit is contained in:
Keith Randall 2020-03-27 11:17:00 -07:00
parent 6ed4661807
commit b1760f3a27
1 changed files with 11 additions and 0 deletions
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11
src/runtime/stack.go
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@ -1033,6 +1033,17 @@ func newstack() {
// Allocate a bigger segment and move the stack.
oldsize := gp.stack.hi - gp.stack.lo
newsize := oldsize * 2
// Make sure we grow at least as much as needed to fit the new frame.
// (This is just an optimization - the caller of morestack will
// recheck the bounds on return.)
if f := findfunc(gp.sched.pc); f.valid() {
max := uintptr(funcMaxSPDelta(f))
for newsize-oldsize < max+_StackGuard {
newsize *= 2
}
}
if newsize > maxstacksize {
print("runtime: goroutine stack exceeds ", maxstacksize, "-byte limit\n")
print("runtime: sp=", hex(sp), " stack=[", hex(gp.stack.lo), ", ", hex(gp.stack.hi), "]\n")