hg: jdk/sandbox: 8132849: Increased stop time in cleanup phase because of single-threaded walk of thread stacks in NMethodSweeper::mark_active_nmethods()

[chris.hegarty at oracle.com]

Changeset: eb954a4b6083
Author:    rkennke
Date:      2018-09-24 18:44 +0200
URL:       http://hg.openjdk.java.net/jdk/sandbox/rev/eb954a4b6083

8132849: Increased stop time in cleanup phase because of single-threaded walk of thread stacks in NMethodSweeper::mark_active_nmethods()
Reviewed-by: eosterlund, zgu, thartmann

! src/hotspot/share/runtime/safepoint.cpp
! src/hotspot/share/runtime/sweeper.cpp
! src/hotspot/share/runtime/sweeper.hpp