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7127706: G1: re-enable survivors during the initial-mark pause

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Re-enable survivors during the initial-mark pause. Afterwards, the concurrent marking threads have to scan them and mark everything reachable from them. The next GC will have to wait for the survivors to be scanned.

Reviewed-by: brutisso, johnc
This commit is contained in:
Antonios Printezis 2012-01-25 12:58:23 -05:00
parent 0fa6fc2279
commit 802519ea53
13 changed files with 425 additions and 82 deletions
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29
hotspot/src/share/vm/gc_implementation/g1/concurrentMarkThread.cpp
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@ -92,9 +92,36 @@ void ConcurrentMarkThread::run() {
ResourceMark rm;
HandleMark hm;
double cycle_start = os::elapsedVTime();
double mark_start_sec = os::elapsedTime();
char verbose_str[128];
// We have to ensure that we finish scanning the root regions
// before the next GC takes place. To ensure this we have to
// make sure that we do not join the STS until the root regions
// have been scanned. If we did then it's possible that a
// subsequent GC could block us from joining the STS and proceed
// without the root regions have been scanned which would be a
// correctness issue.
double scan_start = os::elapsedTime();
if (!cm()->has_aborted()) {
if (PrintGC) {
gclog_or_tty->date_stamp(PrintGCDateStamps);
gclog_or_tty->stamp(PrintGCTimeStamps);
gclog_or_tty->print_cr("[GC concurrent-root-region-scan-start]");
}
_cm->scanRootRegions();
double scan_end = os::elapsedTime();
if (PrintGC) {
gclog_or_tty->date_stamp(PrintGCDateStamps);
gclog_or_tty->stamp(PrintGCTimeStamps);
gclog_or_tty->print_cr("[GC concurrent-root-region-scan-end, %1.7lf]",
scan_end - scan_start);
}
}
double mark_start_sec = os::elapsedTime();
if (PrintGC) {
gclog_or_tty->date_stamp(PrintGCDateStamps);
gclog_or_tty->stamp(PrintGCTimeStamps);