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8351359: OperatingSystemMXBean: values from getCpuLoad and getProcessCpuLoad are stale after 24.8 days (Windows) #3983

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8351359: OperatingSystemMXBean: values from getCpuLoad and getProcessCpuLoad are stale after 24.8 days (Windows) #3983

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8351359: OperatingSystemMXBean: values from getCpuLoad and getProcess…
kevinjwalls May 8, 2025
7640e22
Fix copyright year.
antonvoznia Sep 23, 2025
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8351359: OperatingSystemMXBean: values from getCpuLoad and getProcess… 
…CpuLoad are stale after 24.8 days (Windows)

Reviewed-by: amenkov, sspitsyn
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@kevinjwalls @antonvoznia
kevinjwalls authored and antonvoznia committed Sep 22, 2025
commit f74f04181f90d7560c0a5cbb3dfa9068fb0ed391
8 changes: 5 additions & 3 deletions src/jdk.management/windows/native/libmanagement_ext/OperatingSystemImpl.c
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Original file line number Diff line number Diff line change
Expand Up @@ -50,6 +50,8 @@
#include <process.h>
#pragma warning(pop)

#include <sysinfoapi.h>

typedef unsigned __int32 juint;
typedef unsigned __int64 julong;

Expand Down Expand Up @@ -215,10 +217,10 @@ static PdhLookupPerfNameByIndexFunc PdhLookupPerfNameByIndex_i;
*/
typedef struct {
HQUERY query;
uint64_t lastUpdate; // Last time query was updated (ticks)
uint64_t lastUpdate; // Last time query was updated (millis)
} UpdateQueryS, *UpdateQueryP;

// Min time between query updates (ticks)
// Min time between query updates (millis)
static const int MIN_UPDATE_INTERVAL = 500;

/*
Expand Down Expand Up @@ -993,7 +995,7 @@ bindPdhFunctionPointers(HMODULE h) {
*/
static int
getPerformanceData(UpdateQueryP query, HCOUNTER c, PDH_FMT_COUNTERVALUE* value, DWORD format) {
clock_t now = clock();
uint64_t now = GetTickCount64();

/*
* Need to limit how often we update the query
Expand Down