archive/jdk
1
0
Fork 0
mirror of https://github.com/openjdk/jdk.git synced 2025-08-26 22:34:27 +02:00
Code Issues Projects Releases Packages Wiki Activity Actions

6484982: G1: process references during evacuation pauses

Browse source 
G1 now uses two reference processors - one is used by concurrent marking and the other is used by STW GCs (both full and incremental evacuation pauses). In an evacuation pause, the reference processor is embedded into the closures used to scan objects. Doing so causes causes reference objects to be 'discovered' by the reference processor. At the end of the evacuation pause, these discovered reference objects are processed - preserving (and copying) referent objects (and their reachable graphs) as appropriate.

Reviewed-by: ysr, jwilhelm, brutisso, stefank, tonyp
This commit is contained in:
John Cuthbertson 2011-09-22 10:57:37 -07:00
parent 70bb8e788e
commit 1b62d10b4b
20 changed files with 1448 additions and 632 deletions
Download patch file Download diff file Expand all files Collapse all files

31
hotspot/src/share/vm/gc_implementation/g1/heapRegion.hpp
View file

@ -118,7 +118,6 @@ public:
FilterKind fk);
};
// The complicating factor is that BlockOffsetTable diverged
// significantly, and we need functionality that is only in the G1 version.
// So I copied that code, which led to an alternate G1 version of
@ -223,10 +222,6 @@ class HeapRegion: public G1OffsetTableContigSpace {
ContinuesHumongous
};
// The next filter kind that should be used for a "new_dcto_cl" call with
// the "traditional" signature.
HeapRegionDCTOC::FilterKind _next_fk;
// Requires that the region "mr" be dense with objects, and begin and end
// with an object.
void oops_in_mr_iterate(MemRegion mr, OopClosure* cl);
@ -573,40 +568,14 @@ class HeapRegion: public G1OffsetTableContigSpace {
// allocated in the current region before the last call to "save_mark".
void oop_before_save_marks_iterate(OopClosure* cl);
// This call determines the "filter kind" argument that will be used for
// the next call to "new_dcto_cl" on this region with the "traditional"
// signature (i.e., the call below.) The default, in the absence of a
// preceding call to this method, is "NoFilterKind", and a call to this
// method is necessary for each such call, or else it reverts to the
// default.
// (This is really ugly, but all other methods I could think of changed a
// lot of main-line code for G1.)
void set_next_filter_kind(HeapRegionDCTOC::FilterKind nfk) {
_next_fk = nfk;
}
DirtyCardToOopClosure*
new_dcto_closure(OopClosure* cl,
CardTableModRefBS::PrecisionStyle precision,
HeapRegionDCTOC::FilterKind fk);
#if WHASSUP
DirtyCardToOopClosure*
new_dcto_closure(OopClosure* cl,
CardTableModRefBS::PrecisionStyle precision,
HeapWord* boundary) {
assert(boundary == NULL, "This arg doesn't make sense here.");
DirtyCardToOopClosure* res = new_dcto_closure(cl, precision, _next_fk);
_next_fk = HeapRegionDCTOC::NoFilterKind;
return res;
}
#endif
//
// Note the start or end of marking. This tells the heap region
// that the collector is about to start or has finished (concurrently)
// marking the heap.
//
// Note the start of a marking phase. Record the
// start of the unmarked area of the region here.