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6816154: G1: introduce flags to enable/disable RSet updating and scanning

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Introduces two flags, -XX:-/+G1EnableParallelRSetUpdating and -XX:-/+G1EnableParallelRSetScanning, to turn on/off the "band aid" fix that serializes RSet updating / scanning during GCs.

Reviewed-by: iveresov
This commit is contained in:
Antonios Printezis 2009-03-16 10:52:44 -04:00
parent 82619cc8da
commit 217739210d
2 changed files with 18 additions and 7 deletions
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15
hotspot/src/share/vm/gc_implementation/g1/g1RemSet.cpp
View File

@ -502,14 +502,17 @@ HRInto_G1RemSet::oops_into_collection_set_do(OopsInHeapRegionClosure* oc,
}
if (ParallelGCThreads > 0) {
// This is a temporary change to serialize the update and scanning
// of remembered sets. There are some race conditions when this is
// done in parallel and they are causing failures. When we resolve
// said race conditions, we'll revert back to parallel remembered
// set updating and scanning. See CRs 6677707 and 6677708.
if (worker_i == 0) {
// The two flags below were introduced temporarily to serialize
// the updating and scanning of remembered sets. There are some
// race conditions when these two operations are done in parallel
// and they are causing failures. When we resolve said race
// conditions, we'll revert back to parallel remembered set
// updating and scanning. See CRs 6677707 and 6677708.
if (G1EnableParallelRSetUpdating || (worker_i == 0)) {
updateRS(worker_i);
scanNewRefsRS(oc, worker_i);
}
if (G1EnableParallelRSetScanning || (worker_i == 0)) {
scanRS(oc, worker_i);
}
} else {

10
hotspot/src/share/vm/gc_implementation/g1/g1_globals.hpp
View File

@ -295,6 +295,14 @@
\
product(uintx, G1FixedSurvivorSpaceSize, 0, \
"If non-0 is the size of the G1 survivor space, " \
"otherwise SurvivorRatio is used to determine the size")
"otherwise SurvivorRatio is used to determine the size") \
\
experimental(bool, G1EnableParallelRSetUpdating, false, \
"Enables the parallelization of remembered set updating " \
"during evacuation pauses") \
\
experimental(bool, G1EnableParallelRSetScanning, false, \
"Enables the parallelization of remembered set scanning " \
"during evacuation pauses")
G1_FLAGS(DECLARE_DEVELOPER_FLAG, DECLARE_PD_DEVELOPER_FLAG, DECLARE_PRODUCT_FLAG, DECLARE_PD_PRODUCT_FLAG, DECLARE_DIAGNOSTIC_FLAG, DECLARE_EXPERIMENTAL_FLAG, DECLARE_NOTPRODUCT_FLAG, DECLARE_MANAGEABLE_FLAG, DECLARE_PRODUCT_RW_FLAG)