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7145569: G1: optimize nmethods scanning

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Add a list of nmethods to the RSet for a region that contain references into the region. Skip scanning the code cache during root scanning and scan the nmethod lists during RSet scanning instead.

Reviewed-by: tschatzl, brutisso, mgerdin, twisti, kvn
This commit is contained in:
John Cuthbertson 2013-08-15 10:52:18 +02:00
parent c144b8c30f
commit f63547bf71
22 changed files with 1256 additions and 476 deletions
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78
hotspot/src/share/vm/gc_implementation/g1/g1RemSetSummary.cpp
View file

@ -127,32 +127,55 @@ void G1RemSetSummary::subtract_from(G1RemSetSummary* other) {
class HRRSStatsIter: public HeapRegionClosure {
size_t _occupied;
size_t _total_mem_sz;
size_t _max_mem_sz;
HeapRegion* _max_mem_sz_region;
size_t _total_rs_mem_sz;
size_t _max_rs_mem_sz;
HeapRegion* _max_rs_mem_sz_region;
size_t _total_code_root_mem_sz;
size_t _max_code_root_mem_sz;
HeapRegion* _max_code_root_mem_sz_region;
public:
HRRSStatsIter() :
_occupied(0),
_total_mem_sz(0),
_max_mem_sz(0),
_max_mem_sz_region(NULL)
_total_rs_mem_sz(0),
_max_rs_mem_sz(0),
_max_rs_mem_sz_region(NULL),
_total_code_root_mem_sz(0),
_max_code_root_mem_sz(0),
_max_code_root_mem_sz_region(NULL)
{}
bool doHeapRegion(HeapRegion* r) {
size_t mem_sz = r->rem_set()->mem_size();
if (mem_sz > _max_mem_sz) {
_max_mem_sz = mem_sz;
_max_mem_sz_region = r;
HeapRegionRemSet* hrrs = r->rem_set();
// HeapRegionRemSet::mem_size() includes the
// size of the strong code roots
size_t rs_mem_sz = hrrs->mem_size();
if (rs_mem_sz > _max_rs_mem_sz) {
_max_rs_mem_sz = rs_mem_sz;
_max_rs_mem_sz_region = r;
}
_total_mem_sz += mem_sz;
size_t occ = r->rem_set()->occupied();
_total_rs_mem_sz += rs_mem_sz;
size_t code_root_mem_sz = hrrs->strong_code_roots_mem_size();
if (code_root_mem_sz > _max_code_root_mem_sz) {
_max_code_root_mem_sz = code_root_mem_sz;
_max_code_root_mem_sz_region = r;
}
_total_code_root_mem_sz += code_root_mem_sz;
size_t occ = hrrs->occupied();
_occupied += occ;
return false;
}
size_t total_mem_sz() { return _total_mem_sz; }
size_t max_mem_sz() { return _max_mem_sz; }
size_t total_rs_mem_sz() { return _total_rs_mem_sz; }
size_t max_rs_mem_sz() { return _max_rs_mem_sz; }
HeapRegion* max_rs_mem_sz_region() { return _max_rs_mem_sz_region; }
size_t total_code_root_mem_sz() { return _total_code_root_mem_sz; }
size_t max_code_root_mem_sz() { return _max_code_root_mem_sz; }
HeapRegion* max_code_root_mem_sz_region() { return _max_code_root_mem_sz_region; }
size_t occupied() { return _occupied; }
HeapRegion* max_mem_sz_region() { return _max_mem_sz_region; }
};
double calc_percentage(size_t numerator, size_t denominator) {
@ -184,22 +207,33 @@ void G1RemSetSummary::print_on(outputStream* out) {
HRRSStatsIter blk;
G1CollectedHeap::heap()->heap_region_iterate(&blk);
// RemSet stats
out->print_cr(" Total heap region rem set sizes = "SIZE_FORMAT"K."
" Max = "SIZE_FORMAT"K.",
blk.total_mem_sz()/K, blk.max_mem_sz()/K);
blk.total_rs_mem_sz()/K, blk.max_rs_mem_sz()/K);
out->print_cr(" Static structures = "SIZE_FORMAT"K,"
" free_lists = "SIZE_FORMAT"K.",
HeapRegionRemSet::static_mem_size() / K,
HeapRegionRemSet::fl_mem_size() / K);
out->print_cr(" "SIZE_FORMAT" occupied cards represented.",
blk.occupied());
HeapRegion* max_mem_sz_region = blk.max_mem_sz_region();
HeapRegionRemSet* rem_set = max_mem_sz_region->rem_set();
HeapRegion* max_rs_mem_sz_region = blk.max_rs_mem_sz_region();
HeapRegionRemSet* max_rs_rem_set = max_rs_mem_sz_region->rem_set();
out->print_cr(" Max size region = "HR_FORMAT", "
"size = "SIZE_FORMAT "K, occupied = "SIZE_FORMAT"K.",
HR_FORMAT_PARAMS(max_mem_sz_region),
(rem_set->mem_size() + K - 1)/K,
(rem_set->occupied() + K - 1)/K);
HR_FORMAT_PARAMS(max_rs_mem_sz_region),
(max_rs_rem_set->mem_size() + K - 1)/K,
(max_rs_rem_set->occupied() + K - 1)/K);
out->print_cr(" Did %d coarsenings.", num_coarsenings());
// Strong code root stats
out->print_cr(" Total heap region code-root set sizes = "SIZE_FORMAT"K."
" Max = "SIZE_FORMAT"K.",
blk.total_code_root_mem_sz()/K, blk.max_code_root_mem_sz()/K);
HeapRegion* max_code_root_mem_sz_region = blk.max_code_root_mem_sz_region();
HeapRegionRemSet* max_code_root_rem_set = max_code_root_mem_sz_region->rem_set();
out->print_cr(" Max size region = "HR_FORMAT", "
"size = "SIZE_FORMAT "K, num_elems = "SIZE_FORMAT".",
HR_FORMAT_PARAMS(max_code_root_mem_sz_region),
(max_code_root_rem_set->strong_code_roots_mem_size() + K - 1)/K,
(max_code_root_rem_set->strong_code_roots_list_length()));
}