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8327169: serviceability/dcmd/vm/SystemMapTest.java and SystemDumpMapTest.java may fail after JDK-8326586

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Reviewed-by: jsjolen, mbaesken
This commit is contained in:
Thomas Stuefe 2024-03-21 12:13:10 +00:00
parent 700679011e
commit c434b79cff
1 changed files with 8 additions and 6 deletions
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14
src/hotspot/share/nmt/memMapPrinter.cpp
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@ -89,8 +89,11 @@ class CachedNMTInformation : public VirtualMemoryWalker {
Range* _ranges;
MEMFLAGS* _flags;
size_t _count, _capacity;
mutable size_t _last;
public:
CachedNMTInformation() : _ranges(nullptr), _flags(nullptr), _count(0), _capacity(0) {}
CachedNMTInformation() : _ranges(nullptr), _flags(nullptr),
_count(0), _capacity(0), _last(0) {}
~CachedNMTInformation() {
ALLOW_C_FUNCTION(free, ::free(_ranges);)
@ -131,17 +134,16 @@ public:
// We optimize for sequential lookups. Since this class is used when a list
// of OS mappings is scanned (VirtualQuery, /proc/pid/maps), and these lists
// are usually sorted in order of addresses, ascending.
static uintx last = 0;
if (to <= _ranges[last].from) {
if (to <= _ranges[_last].from) {
// the range is to the right of the given section, we need to re-start the search
last = 0;
_last = 0;
}
MemFlagBitmap bm;
for(uintx i = last; i < _count; i++) {
for(uintx i = _last; i < _count; i++) {
if (range_intersects(from, to, _ranges[i].from, _ranges[i].to)) {
bm.set_flag(_flags[i]);
} else if (to <= _ranges[i].from) {
last = i;
_last = i;
break;
}
}