archive/jdk
1
0
Fork 0
mirror of https://github.com/openjdk/jdk.git synced 2025-09-20 02:54:35 +02:00
Code Issues Projects Releases Packages Wiki Activity Actions

8150390: Move rs length sampling data to the sampling thread

Browse source 
Reviewed-by: drwhite, jwilhelm
This commit is contained in:
Mikael Gerdin 2016-02-25 11:20:03 +01:00
parent 4f6dba1568
commit 167ce92545
7 changed files with 32 additions and 74 deletions
Download patch file Download diff file Expand all files Collapse all files

29
hotspot/src/share/vm/gc/g1/g1YoungRemSetSamplingThread.cpp
View file

@ -26,6 +26,8 @@
#include "gc/g1/g1CollectedHeap.inline.hpp"
#include "gc/g1/g1CollectorPolicy.hpp"
#include "gc/g1/g1YoungRemSetSamplingThread.hpp"
#include "gc/g1/heapRegion.inline.hpp"
#include "gc/g1/heapRegionRemSet.hpp"
#include "gc/g1/suspendibleThreadSet.hpp"
#include "runtime/mutexLocker.hpp"
@ -100,22 +102,35 @@ void G1YoungRemSetSamplingThread::sample_young_list_rs_lengths() {
G1CollectorPolicy* g1p = g1h->g1_policy();
if (g1p->adaptive_young_list_length()) {
int regions_visited = 0;
g1h->young_list()->rs_length_sampling_init();
while (g1h->young_list()->rs_length_sampling_more()) {
g1h->young_list()->rs_length_sampling_next();
HeapRegion* hr = g1h->young_list()->first_region();
size_t sampled_rs_lengths = 0;
while (hr != NULL) {
size_t rs_length = hr->rem_set()->occupied();
sampled_rs_lengths += rs_length;
// The current region may not yet have been added to the
// incremental collection set (it gets added when it is
// retired as the current allocation region).
if (hr->in_collection_set()) {
// Update the collection set policy information for this region
g1p->update_incremental_cset_info(hr, rs_length);
}
++regions_visited;
// we try to yield every time we visit 10 regions
if (regions_visited == 10) {
if (sts.should_yield()) {
sts.yield();
// we just abandon the iteration
break;
// A gc may have occurred and our sampling data is stale and further
// traversal of the young list is unsafe
return;
}
regions_visited = 0;
}
hr = hr->get_next_young_region();
}
g1p->revise_young_list_target_length_if_necessary();
g1p->revise_young_list_target_length_if_necessary(sampled_rs_lengths);
}
}