Mercurial > hg > graal-compiler
changeset 20326:da00a41842a5
8038265: CMS: enable time based triggering of concurrent cycles
Reviewed-by: mgerdin, brutisso
Contributed-by: michal@frajt.eu
| author | brutisso |
|---|---|
| date | Wed, 23 Apr 2014 12:37:36 +0200 |
| parents | 43aa571c1131 |
| children | 411e30e5fbb8 |
| files | src/share/vm/gc_implementation/concurrentMarkSweep/concurrentMarkSweepGeneration.cpp src/share/vm/runtime/globals.hpp |
| diffstat | 2 files changed, 28 insertions(+), 0 deletions(-) [+] |
line wrap: on
line diff
--- a/src/share/vm/gc_implementation/concurrentMarkSweep/concurrentMarkSweepGeneration.cpp Fri Aug 15 11:39:29 2014 -0700 +++ b/src/share/vm/gc_implementation/concurrentMarkSweep/concurrentMarkSweepGeneration.cpp Wed Apr 23 12:37:36 2014 +0200 @@ -1514,6 +1514,8 @@ gclog_or_tty->print_cr("cms_allocation_rate=%g", stats().cms_allocation_rate()); gclog_or_tty->print_cr("occupancy=%3.7f", _cmsGen->occupancy()); gclog_or_tty->print_cr("initiatingOccupancy=%3.7f", _cmsGen->initiating_occupancy()); + gclog_or_tty->print_cr("cms_time_since_begin=%3.7f", stats().cms_time_since_begin()); + gclog_or_tty->print_cr("cms_time_since_end=%3.7f", stats().cms_time_since_end()); gclog_or_tty->print_cr("metadata initialized %d", MetaspaceGC::should_concurrent_collect()); } @@ -1576,6 +1578,28 @@ return true; } + // CMSTriggerInterval starts a CMS cycle if enough time has passed. + if (CMSTriggerInterval >= 0) { + if (CMSTriggerInterval == 0) { + // Trigger always + return true; + } + + // Check the CMS time since begin (we do not check the stats validity + // as we want to be able to trigger the first CMS cycle as well) + if (stats().cms_time_since_begin() >= (CMSTriggerInterval / ((double) MILLIUNITS))) { + if (Verbose && PrintGCDetails) { + if (stats().valid()) { + gclog_or_tty->print_cr("CMSCollector: collect because of trigger interval (time since last begin %3.7f secs)", + stats().cms_time_since_begin()); + } else { + gclog_or_tty->print_cr("CMSCollector: collect because of trigger interval (first collection)"); + } + } + return true; + } + } + return false; }
--- a/src/share/vm/runtime/globals.hpp Fri Aug 15 11:39:29 2014 -0700 +++ b/src/share/vm/runtime/globals.hpp Wed Apr 23 12:37:36 2014 +0200 @@ -1945,6 +1945,10 @@ "not just one of the generations (e.g., G1). A value of 0 " \ "denotes 'do constant GC cycles'.") \ \ + manageable(intx, CMSTriggerInterval, -1, \ + "Commence a CMS collection cycle (at least) every so many " \ + "milliseconds (0 permanently, -1 disabled)") \ + \ product(bool, UseCMSInitiatingOccupancyOnly, false, \ "Only use occupancy as a criterion for starting a CMS collection")\ \