1978     return;
1979   }
1980 
1981   g1h->verify_region_sets_optional();
1982 
1983   if (VerifyDuringGC) {
1984     HandleMark hm;  // handle scope
1985     g1h->prepare_for_verify();
1986     Universe::verify(VerifyOption_G1UsePrevMarking,
1987                      " VerifyDuringGC:(before)");
1988   }
1989   g1h->check_bitmaps("Cleanup Start");
1990 
1991   G1CollectorPolicy* g1p = g1h->g1_policy();
1992   g1p->record_concurrent_mark_cleanup_start();
1993 
1994   double start = os::elapsedTime();
1995 
1996   HeapRegionRemSet::reset_for_cleanup_tasks();
1997 
1998   uint n_workers;
1999 
2000   // Do counting once more with the world stopped for good measure.
2001   G1ParFinalCountTask g1_par_count_task(g1h, &_region_bm, &_card_bm);
2002 
2003   g1h->set_par_threads();
2004   n_workers = g1h->n_par_threads();
2005   assert(g1h->n_par_threads() == n_workers,
2006          "Should not have been reset");
2007   g1h->workers()->run_task(&g1_par_count_task);
2008   // Done with the parallel phase so reset to 0.
2009   g1h->set_par_threads(0);
2010 
2011   if (VerifyDuringGC) {
2012     // Verify that the counting data accumulated during marking matches
2013     // that calculated by walking the marking bitmap.
2014 
2015     // Bitmaps to hold expected values
2016     BitMap expected_region_bm(_region_bm.size(), true);
2017     BitMap expected_card_bm(_card_bm.size(), true);
2018 
2019     G1ParVerifyFinalCountTask g1_par_verify_task(g1h,
2020                                                  &_region_bm,
2021                                                  &_card_bm,
2022                                                  &expected_region_bm,
2023                                                  &expected_card_bm);
2024 
2025     g1h->set_par_threads((int)n_workers);
2026     g1h->workers()->run_task(&g1_par_verify_task);

1978     return;
1979   }
1980 
1981   g1h->verify_region_sets_optional();
1982 
1983   if (VerifyDuringGC) {
1984     HandleMark hm;  // handle scope
1985     g1h->prepare_for_verify();
1986     Universe::verify(VerifyOption_G1UsePrevMarking,
1987                      " VerifyDuringGC:(before)");
1988   }
1989   g1h->check_bitmaps("Cleanup Start");
1990 
1991   G1CollectorPolicy* g1p = g1h->g1_policy();
1992   g1p->record_concurrent_mark_cleanup_start();
1993 
1994   double start = os::elapsedTime();
1995 
1996   HeapRegionRemSet::reset_for_cleanup_tasks();
1997 


1998   // Do counting once more with the world stopped for good measure.
1999   G1ParFinalCountTask g1_par_count_task(g1h, &_region_bm, &_card_bm);
2000 
2001   g1h->set_par_threads();
2002   uint n_workers = _g1h->workers()->active_workers();


2003   g1h->workers()->run_task(&g1_par_count_task);
2004   // Done with the parallel phase so reset to 0.
2005   g1h->set_par_threads(0);
2006 
2007   if (VerifyDuringGC) {
2008     // Verify that the counting data accumulated during marking matches
2009     // that calculated by walking the marking bitmap.
2010 
2011     // Bitmaps to hold expected values
2012     BitMap expected_region_bm(_region_bm.size(), true);
2013     BitMap expected_card_bm(_card_bm.size(), true);
2014 
2015     G1ParVerifyFinalCountTask g1_par_verify_task(g1h,
2016                                                  &_region_bm,
2017                                                  &_card_bm,
2018                                                  &expected_region_bm,
2019                                                  &expected_card_bm);
2020 
2021     g1h->set_par_threads((int)n_workers);
2022     g1h->workers()->run_task(&g1_par_verify_task);