tree f9bb71c8f7e952ea13f614a5afa63a89c8d7e429
parent 459a8a94e04a19bde7173ef7cf2db369c2e62e2d
author Ian Lance Taylor <iant@golang.org> 1518825242 -0800
committer Ian Lance Taylor <iant@golang.org> 1519140550 +0000

runtime: allow preemption in fast syscall return

Let a fast syscall return be a preemption point.  This helps with
tight loops that make system calls, as in BenchmarkSyscallExcessWork.

Change-Id: I9c723398cf1678afb70ca8281e9aa0339b98b8dc
Reviewed-on: https://go-review.googlesource.com/94895
Reviewed-by: Than McIntosh <thanm@google.com>