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8154745: Move default G1 pause time target setup to argument parsing

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Reviewed-by: ehelin, sjohanss
This commit is contained in:
Mikael Gerdin 2016-04-19 14:53:32 +02:00
parent 7587fbdd30
commit 91b2afa99d
4 changed files with 32 additions and 39 deletions
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22
hotspot/src/share/vm/runtime/arguments.cpp
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@ -2116,6 +2116,28 @@ void Arguments::set_g1_gc_flags() {
FLAG_SET_DEFAULT(GCTimeRatio, 12);
}
// Below, we might need to calculate the pause time interval based on
// the pause target. When we do so we are going to give G1 maximum
// flexibility and allow it to do pauses when it needs to. So, we'll
// arrange that the pause interval to be pause time target + 1 to
// ensure that a) the pause time target is maximized with respect to
// the pause interval and b) we maintain the invariant that pause
// time target < pause interval. If the user does not want this
// maximum flexibility, they will have to set the pause interval
// explicitly.
if (FLAG_IS_DEFAULT(MaxGCPauseMillis)) {
// The default pause time target in G1 is 200ms
FLAG_SET_DEFAULT(MaxGCPauseMillis, 200);
}
// Then, if the interval parameter was not set, set it according to
// the pause time target (this will also deal with the case when the
// pause time target is the default value).
if (FLAG_IS_DEFAULT(GCPauseIntervalMillis)) {
FLAG_SET_DEFAULT(GCPauseIntervalMillis, MaxGCPauseMillis + 1);
}
log_trace(gc)("MarkStackSize: %uk MarkStackSizeMax: %uk", (unsigned int) (MarkStackSize / K), (uint) (MarkStackSizeMax / K));
log_trace(gc)("ConcGCThreads: %u", ConcGCThreads);
}