6058603471
We're about to introduce asynchronous safe points, where we won't have precise pointer maps for all stack frames. That's okay for scanning the stack (conservatively), but not for shrinking the stack. Hence, this CL prepares for this by only shrinking the stack as part of the stack scan if the goroutine is stopped at a synchronous safe point. Otherwise, it queues up the stack shrink for the next synchronous safe point. We already have one condition under which we can't shrink the stack for very similar reasons: syscalls. Currently, we just give up on shrinking the stack if it's in a syscall. But with this mechanism, we defer that stack shrink until the next synchronous safe point. For #10958, #24543. Change-Id: Ifa1dec6f33fdf30f9067be2ce3f7ab8a7f62ce38 Reviewed-on: https://go-review.googlesource.com/c/go/+/201438 Run-TryBot: Austin Clements <austin@google.com> TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by: Cherry Zhang <cherryyz@google.com> |
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