Java example source code file (OperatingSystemImpl.c)
The OperatingSystemImpl.c Java example source code
/*
* Copyright (c) 2003, 2013, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
#include "jni.h"
#include "jni_util.h"
#include "jlong.h"
#include "jvm.h"
#include "management.h"
#include "sun_management_OperatingSystemImpl.h"
#include <psapi.h>
#include <errno.h>
#include <stdlib.h>
#include <malloc.h>
#pragma warning (push,0)
#include <windows.h>
#pragma warning (pop)
#include <stdio.h>
#include <time.h>
#include <stdint.h>
#include <assert.h>
/* Disable warnings due to broken header files from Microsoft... */
#pragma warning(push, 3)
#include <pdh.h>
#include <pdhmsg.h>
#include <process.h>
#pragma warning(pop)
typedef unsigned __int32 juint;
typedef unsigned __int64 julong;
typedef enum boolean_values { false=0, true=1};
static void set_low(jlong* value, jint low) {
*value &= (jlong)0xffffffff << 32;
*value |= (jlong)(julong)(juint)low;
}
static void set_high(jlong* value, jint high) {
*value &= (jlong)(julong)(juint)0xffffffff;
*value |= (jlong)high << 32;
}
static jlong jlong_from(jint h, jint l) {
jlong result = 0; // initialization to avoid warning
set_high(&result, h);
set_low(&result, l);
return result;
}
static HANDLE main_process;
int perfiInit(void);
JNIEXPORT void JNICALL
Java_sun_management_OperatingSystemImpl_initialize
(JNIEnv *env, jclass cls)
{
main_process = GetCurrentProcess();
perfiInit();
}
JNIEXPORT jlong JNICALL
Java_sun_management_OperatingSystemImpl_getCommittedVirtualMemorySize0
(JNIEnv *env, jobject mbean)
{
PROCESS_MEMORY_COUNTERS pmc;
if (GetProcessMemoryInfo(main_process, &pmc, sizeof(PROCESS_MEMORY_COUNTERS)) == 0) {
return (jlong)-1L;
} else {
return (jlong) pmc.PagefileUsage;
}
}
JNIEXPORT jlong JNICALL
Java_sun_management_OperatingSystemImpl_getTotalSwapSpaceSize
(JNIEnv *env, jobject mbean)
{
MEMORYSTATUSEX ms;
ms.dwLength = sizeof(ms);
GlobalMemoryStatusEx(&ms);
return (jlong) ms.ullTotalPageFile;
}
JNIEXPORT jlong JNICALL
Java_sun_management_OperatingSystemImpl_getFreeSwapSpaceSize
(JNIEnv *env, jobject mbean)
{
MEMORYSTATUSEX ms;
ms.dwLength = sizeof(ms);
GlobalMemoryStatusEx(&ms);
return (jlong) ms.ullAvailPageFile;
}
JNIEXPORT jlong JNICALL
Java_sun_management_OperatingSystemImpl_getProcessCpuTime
(JNIEnv *env, jobject mbean)
{
FILETIME process_creation_time, process_exit_time,
process_user_time, process_kernel_time;
// Using static variables declared above
// Units are 100-ns intervals. Convert to ns.
GetProcessTimes(main_process, &process_creation_time,
&process_exit_time,
&process_kernel_time, &process_user_time);
return (jlong_from(process_user_time.dwHighDateTime,
process_user_time.dwLowDateTime) +
jlong_from(process_kernel_time.dwHighDateTime,
process_kernel_time.dwLowDateTime)) * 100;
}
JNIEXPORT jlong JNICALL
Java_sun_management_OperatingSystemImpl_getFreePhysicalMemorySize
(JNIEnv *env, jobject mbean)
{
MEMORYSTATUSEX ms;
ms.dwLength = sizeof(ms);
GlobalMemoryStatusEx(&ms);
return (jlong) ms.ullAvailPhys;
}
JNIEXPORT jlong JNICALL
Java_sun_management_OperatingSystemImpl_getTotalPhysicalMemorySize
(JNIEnv *env, jobject mbean)
{
MEMORYSTATUSEX ms;
ms.dwLength = sizeof(ms);
GlobalMemoryStatusEx(&ms);
return (jlong) ms.ullTotalPhys;
}
// Seems WinXP PDH returns PDH_MORE_DATA whenever we send in a NULL buffer.
// Let's just ignore it, since we make sure we have enough buffer anyway.
static int
pdh_fail(PDH_STATUS pdhStat) {
return pdhStat != ERROR_SUCCESS && pdhStat != PDH_MORE_DATA;
}
// INFO: Using PDH APIs Correctly in a Localized Language (Q287159)
// http://support.microsoft.com/default.aspx?scid=kb;EN-US;q287159
// The index value for the base system counters and objects like processor,
// process, thread, memory, and so forth are always the same irrespective
// of the localized version of the operating system or service pack installed.
#define PDH_PROCESSOR_IDX ((DWORD) 238)
#define PDH_PROCESSOR_TIME_IDX ((DWORD) 6)
#define PDH_PRIV_PROCESSOR_TIME_IDX ((DWORD) 144)
#define PDH_PROCESS_IDX ((DWORD) 230)
#define PDH_ID_PROCESS_IDX ((DWORD) 784)
#define PDH_CONTEXT_SWITCH_RATE_IDX ((DWORD) 146)
#define PDH_SYSTEM_IDX ((DWORD) 2)
#define PDH_VIRTUAL_BYTES_IDX ((DWORD) 174)
typedef PDH_STATUS (WINAPI *PdhAddCounterFunc)(
HQUERY hQuery,
LPCSTR szFullCounterPath,
DWORD dwUserData,
HCOUNTER *phCounter
);
typedef PDH_STATUS (WINAPI *PdhOpenQueryFunc)(
LPCWSTR szDataSource,
DWORD dwUserData,
HQUERY *phQuery
);
typedef DWORD (WINAPI *PdhCloseQueryFunc)(
HQUERY hQuery
);
typedef PDH_STATUS (WINAPI *PdhCollectQueryDataFunc)(
HQUERY hQuery
);
typedef DWORD (WINAPI *PdhGetFormattedCounterValueFunc)(
HCOUNTER hCounter,
DWORD dwFormat,
LPDWORD lpdwType,
PPDH_FMT_COUNTERVALUE pValue
);
typedef PDH_STATUS (WINAPI *PdhEnumObjectItemsFunc)(
LPCTSTR szDataSource,
LPCTSTR szMachineName,
LPCTSTR szObjectName,
LPTSTR mszCounterList,
LPDWORD pcchCounterListLength,
LPTSTR mszInstanceList,
LPDWORD pcchInstanceListLength,
DWORD dwDetailLevel,
DWORD dwFlags
);
typedef PDH_STATUS (WINAPI *PdhRemoveCounterFunc)(
HCOUNTER hCounter
);
typedef PDH_STATUS (WINAPI *PdhLookupPerfNameByIndexFunc)(
LPCSTR szMachineName,
DWORD dwNameIndex,
LPSTR szNameBuffer,
LPDWORD pcchNameBufferSize
);
typedef PDH_STATUS (WINAPI *PdhMakeCounterPathFunc)(
PDH_COUNTER_PATH_ELEMENTS *pCounterPathElements,
LPTSTR szFullPathBuffer,
LPDWORD pcchBufferSize,
DWORD dwFlags
);
static PdhAddCounterFunc PdhAddCounter_i;
static PdhOpenQueryFunc PdhOpenQuery_i;
static PdhCloseQueryFunc PdhCloseQuery_i;
static PdhCollectQueryDataFunc PdhCollectQueryData_i;
static PdhGetFormattedCounterValueFunc PdhGetFormattedCounterValue_i;
static PdhEnumObjectItemsFunc PdhEnumObjectItems_i;
static PdhRemoveCounterFunc PdhRemoveCounter_i;
static PdhLookupPerfNameByIndexFunc PdhLookupPerfNameByIndex_i;
static PdhMakeCounterPathFunc PdhMakeCounterPath_i;
static HANDLE thisProcess;
static double cpuFactor;
static DWORD num_cpus;
#define FT2JLONG(X) ((((jlong)X.dwHighDateTime) << 32) | ((jlong)X.dwLowDateTime))
#define COUNTER_BUF_SIZE 256
// Min time between query updates.
#define MIN_UPDATE_INTERVAL 500
#define CONFIG_SUCCESSFUL 0
/**
* Struct for PDH queries.
*/
typedef struct {
HQUERY query;
uint64_t lastUpdate; // Last time query was updated (current millis).
} UpdateQueryS, *UpdateQueryP;
/**
* Struct for the processor load counters.
*/
typedef struct {
UpdateQueryS query;
HCOUNTER* counters;
int noOfCounters;
} MultipleCounterQueryS, *MultipleCounterQueryP;
/**
* Struct for the jvm process load counter.
*/
typedef struct {
UpdateQueryS query;
HCOUNTER counter;
} SingleCounterQueryS, *SingleCounterQueryP;
static char* getProcessPDHHeader(void);
/**
* Currently available counters.
*/
static SingleCounterQueryS cntCtxtSwitchRate;
static SingleCounterQueryS cntVirtualSize;
static SingleCounterQueryS cntProcLoad;
static SingleCounterQueryS cntProcSystemLoad;
static MultipleCounterQueryS multiCounterCPULoad;
static CRITICAL_SECTION processHeaderLock;
static CRITICAL_SECTION initializationLock;
/**
* Initialize the perf module at startup.
*/
int
perfiInit(void)
{
InitializeCriticalSection(&processHeaderLock);
InitializeCriticalSection(&initializationLock);
return 0;
}
/**
* Dynamically sets up function pointers to the PDH library.
*
* @return CONFIG_SUCCESSFUL on success, negative on failure.
*/
static int
get_functions(HMODULE h, char *ebuf, size_t elen) {
// The 'A' at the end means the ANSI (not the UNICODE) vesions of the methods
PdhAddCounter_i = (PdhAddCounterFunc)GetProcAddress(h, "PdhAddCounterA");
PdhOpenQuery_i = (PdhOpenQueryFunc)GetProcAddress(h, "PdhOpenQueryA");
PdhCloseQuery_i = (PdhCloseQueryFunc)GetProcAddress(h, "PdhCloseQuery");
PdhCollectQueryData_i = (PdhCollectQueryDataFunc)GetProcAddress(h, "PdhCollectQueryData");
PdhGetFormattedCounterValue_i = (PdhGetFormattedCounterValueFunc)GetProcAddress(h, "PdhGetFormattedCounterValue");
PdhEnumObjectItems_i = (PdhEnumObjectItemsFunc)GetProcAddress(h, "PdhEnumObjectItemsA");
PdhRemoveCounter_i = (PdhRemoveCounterFunc)GetProcAddress(h, "PdhRemoveCounter");
PdhLookupPerfNameByIndex_i = (PdhLookupPerfNameByIndexFunc)GetProcAddress(h, "PdhLookupPerfNameByIndexA");
PdhMakeCounterPath_i = (PdhMakeCounterPathFunc)GetProcAddress(h, "PdhMakeCounterPathA");
if (PdhAddCounter_i == NULL || PdhOpenQuery_i == NULL ||
PdhCloseQuery_i == NULL || PdhCollectQueryData_i == NULL ||
PdhGetFormattedCounterValue_i == NULL || PdhEnumObjectItems_i == NULL ||
PdhRemoveCounter_i == NULL || PdhLookupPerfNameByIndex_i == NULL || PdhMakeCounterPath_i == NULL)
{
_snprintf(ebuf, elen, "Required method could not be found.");
return -1;
}
return CONFIG_SUCCESSFUL;
}
/**
* Returns the counter value as a double for the specified query.
* Will collect the query data and update the counter values as necessary.
*
* @param query the query to update (if needed).
* @param c the counter to read.
* @param value where to store the formatted value.
* @param format the format to use (i.e. PDH_FMT_DOUBLE, PDH_FMT_LONG etc)
* @return CONFIG_SUCCESSFUL if no error
* -1 if PdhCollectQueryData fails
* -2 if PdhGetFormattedCounterValue fails
*/
static int
getPerformanceData(UpdateQueryP query, HCOUNTER c, PDH_FMT_COUNTERVALUE* value, DWORD format) {
clock_t now;
now = clock();
// Need to limit how often we update the query
// to mimise the heisenberg effect.
// (PDH behaves erratically if the counters are
// queried too often, especially counters that
// store and use values from two consecutive updates,
// like cpu load.)
if (now - query->lastUpdate > MIN_UPDATE_INTERVAL) {
if (PdhCollectQueryData_i(query->query) != ERROR_SUCCESS) {
return -1;
}
query->lastUpdate = now;
}
if (PdhGetFormattedCounterValue_i(c, format, NULL, value) != ERROR_SUCCESS) {
return -2;
}
return CONFIG_SUCCESSFUL;
}
/**
* Places the resolved counter name of the counter at the specified index in the
* supplied buffer. There must be enough space in the buffer to hold the counter name.
*
* @param index the counter index as specified in the registry.
* @param buf the buffer in which to place the counter name.
* @param size the size of the counter name buffer.
* @param ebuf the error message buffer.
* @param elen the length of the error buffer.
* @return CONFIG_SUCCESSFUL if successful, negative on failure.
*/
static int
find_name(DWORD index, char *buf, DWORD size) {
PDH_STATUS res;
if ((res = PdhLookupPerfNameByIndex_i(NULL, index, buf, &size)) != ERROR_SUCCESS) {
/* printf("Could not open counter %d: error=0x%08x", index, res); */
/* if (res == PDH_CSTATUS_NO_MACHINE) { */
/* printf("User probably does not have sufficient privileges to use"); */
/* printf("performance counters. If you are running on Windows 2003"); */
/* printf("or Windows Vista, make sure the user is in the"); */
/* printf("Performance Logs user group."); */
/* } */
return -1;
}
if (size == 0) {
/* printf("Failed to get counter name for %d: empty string", index); */
return -1;
}
// windows vista does not null-terminate the string (allthough the docs says it will)
buf[size - 1] = '\0';
return CONFIG_SUCCESSFUL;
}
/**
* Sets up the supplied SingleCounterQuery to listen for the specified counter.
* initPDH() must have been run prior to calling this function!
*
* @param counterQuery the counter query to set up.
* @param counterString the string specifying the path to the counter.
* @param ebuf the error buffer.
* @param elen the length of the error buffer.
* @returns CONFIG_SUCCESSFUL if successful, negative on failure.
*/
static int
initSingleCounterQuery(SingleCounterQueryP counterQuery, char *counterString) {
if (PdhOpenQuery_i(NULL, 0, &counterQuery->query.query) != ERROR_SUCCESS) {
/* printf("Could not open query for %s", counterString); */
return -1;
}
if (PdhAddCounter_i(counterQuery->query.query, counterString, 0, &counterQuery->counter) != ERROR_SUCCESS) {
/* printf("Could not add counter %s for query", counterString); */
if (counterQuery->counter != NULL) {
PdhRemoveCounter_i(counterQuery->counter);
}
if (counterQuery->query.query != NULL) {
PdhCloseQuery_i(counterQuery->query.query);
}
memset(counterQuery, 0, sizeof(SingleCounterQueryS));
return -1;
}
return CONFIG_SUCCESSFUL;
}
/**
* Sets up the supplied SingleCounterQuery to listen for the time spent
* by the HotSpot process.
*
* @param counterQuery the counter query to set up as a process counter.
* @param ebuf the error buffer.
* @param elen the length of the error buffer.
* @returns CONFIG_SUCCESSFUL if successful, negative on failure.
*/
static int
initProcLoadCounter(void) {
char time[COUNTER_BUF_SIZE];
char counter[COUNTER_BUF_SIZE*2];
if (find_name(PDH_PROCESSOR_TIME_IDX, time, sizeof(time)-1) < 0) {
return -1;
}
_snprintf(counter, sizeof(counter)-1, "%s\\%s", getProcessPDHHeader(), time);
return initSingleCounterQuery(&cntProcLoad, counter);
}
static int
initProcSystemLoadCounter(void) {
char time[COUNTER_BUF_SIZE];
char counter[COUNTER_BUF_SIZE*2];
if (find_name(PDH_PRIV_PROCESSOR_TIME_IDX, time, sizeof(time)-1) < 0) {
return -1;
}
_snprintf(counter, sizeof(counter)-1, "%s\\%s", getProcessPDHHeader(), time);
return initSingleCounterQuery(&cntProcSystemLoad, counter);
}
/**
* Sets up the supplied MultipleCounterQuery to check on the processors.
* (Comment: Refactor and prettify as with the the SingleCounter queries
* if more MultipleCounterQueries are discovered.)
*
* initPDH() must have been run prior to calling this function.
*
* @param multiQuery a pointer to a MultipleCounterQueryS, will be filled in with
* the necessary info to check the PDH processor counters.
* @return CONFIG_SUCCESSFUL if successful, negative on failure.
*/
static int
initProcessorCounters(void) {
char processor[COUNTER_BUF_SIZE]; //'Processor' == #238
char time[COUNTER_BUF_SIZE]; //'Time' == 6
DWORD c_size, i_size;
HQUERY tmpQuery;
DWORD i, p_count;
BOOL error;
char *instances, *tmp;
PDH_STATUS pdhStat;
c_size = i_size = 0;
tmpQuery = NULL;
error = false;
// This __try / __except stuff is there since Windows 2000 beta (or so) sometimes triggered
// an access violation when the user had insufficient privileges to use the performance
// counters. This was previously guarded by a very ugly piece of code which disabled the
// global trap handling in JRockit. Don't know if this really is needed anymore, but otoh,
// if we keep it we don't crash on Win2k beta. /Ihse, 2005-05-30
__try {
if (find_name(PDH_PROCESSOR_IDX, processor, sizeof(processor)-1) < 0) {
return -1;
}
} __except (EXCEPTION_EXECUTE_HANDLER) { // We'll catch all exceptions here.
/* printf("User does not have sufficient privileges to use performance counters"); */
return -1;
}
if (find_name(PDH_PROCESSOR_TIME_IDX, time, sizeof(time)-1) < 0) {
return -1;
}
//ok, now we have enough to enumerate all processors.
pdhStat = PdhEnumObjectItems_i (
NULL, // reserved
NULL, // local machine
processor, // object to enumerate
NULL, // pass in NULL buffers
&c_size, // and 0 length to get
NULL, // required size
&i_size, // of the buffers in chars
PERF_DETAIL_WIZARD, // counter detail level
0);
if (pdh_fail(pdhStat)) {
/* printf("could not enumerate processors (1) error=%d", pdhStat); */
return -1;
}
// use calloc because windows vista does not null terminate the instance names (allthough the docs says it will)
instances = calloc(i_size, 1);
if (instances == NULL) {
/* printf("could not allocate memory (1) %d bytes", i_size); */
error = true;
goto end;
}
c_size = 0;
pdhStat = PdhEnumObjectItems_i (
NULL, // reserved
NULL, // local machine
processor, // object to enumerate
NULL, // pass in NULL buffers
&c_size, // and 0 length to get
instances, // required size
&i_size, // of the buffers in chars
PERF_DETAIL_WIZARD, // counter detail level
0);
if (pdh_fail(pdhStat)) {
/* printf("could not enumerate processors (2) error=%d", pdhStat); */
error = true;
goto end;
}
//count perf count instances.
for (p_count = 0, tmp = instances; *tmp != 0; tmp = &tmp[lstrlen(tmp)+1], p_count++);
//is this correct for HT?
assert(p_count == num_cpus+1);
//ok, have number of perf counters.
multiCounterCPULoad.counters = calloc(p_count, sizeof(HCOUNTER));
if (multiCounterCPULoad.counters == NULL) {
/* printf("could not allocate memory (2) count=%d", p_count); */
error = true;
goto end;
}
multiCounterCPULoad.noOfCounters = p_count;
if (PdhOpenQuery_i(NULL, 0, &multiCounterCPULoad.query.query) != ERROR_SUCCESS) {
/* printf("could not create query"); */
error = true;
goto end;
}
//now, fetch the counters.
for (i = 0, tmp = instances; *tmp != '\0'; tmp = &tmp[lstrlen(tmp)+1], i++) {
char counter[2*COUNTER_BUF_SIZE];
_snprintf(counter, sizeof(counter)-1, "\\%s(%s)\\%s", processor, tmp, time);
if (PdhAddCounter_i(multiCounterCPULoad.query.query, counter, 0, &multiCounterCPULoad.counters[i]) != ERROR_SUCCESS) {
/* printf("error adding processor counter %s", counter); */
error = true;
goto end;
}
}
free(instances);
instances = NULL;
// Query once to initialize the counters needing at least two queries
// (like the % CPU usage) to calculate correctly.
if (PdhCollectQueryData_i(multiCounterCPULoad.query.query) != ERROR_SUCCESS)
error = true;
end:
if (instances != NULL) {
free(instances);
}
if (tmpQuery != NULL) {
PdhCloseQuery_i(tmpQuery);
}
if (error) {
int i;
if (multiCounterCPULoad.counters != NULL) {
for (i = 0; i < multiCounterCPULoad.noOfCounters; i++) {
if (multiCounterCPULoad.counters[i] != NULL) {
PdhRemoveCounter_i(multiCounterCPULoad.counters[i]);
}
}
free(multiCounterCPULoad.counters[i]);
}
if (multiCounterCPULoad.query.query != NULL) {
PdhCloseQuery_i(multiCounterCPULoad.query.query);
}
memset(&multiCounterCPULoad, 0, sizeof(MultipleCounterQueryS));
return -1;
}
return CONFIG_SUCCESSFUL;
}
/**
* Help function that initializes the PDH process header for the JRockit process.
* (You should probably use getProcessPDHHeader() instead!)
*
* initPDH() must have been run prior to calling this function.
*
* @param ebuf the error buffer.
* @param elen the length of the error buffer.
*
* @return the PDH instance description corresponding to the JVM process.
*/
static char*
initProcessPDHHeader(void) {
static char hotspotheader[2*COUNTER_BUF_SIZE];
char counter[2*COUNTER_BUF_SIZE];
char processes[COUNTER_BUF_SIZE]; //'Process' == #230
char pid[COUNTER_BUF_SIZE]; //'ID Process' == 784
char module_name[MAX_PATH];
PDH_STATUS pdhStat;
DWORD c_size = 0, i_size = 0;
HQUERY tmpQuery = NULL;
int i, myPid = _getpid();
BOOL error = false;
char *instances, *tmp, *instance_name, *dot_pos;
tmpQuery = NULL;
myPid = _getpid();
error = false;
if (find_name(PDH_PROCESS_IDX, processes, sizeof(processes) - 1) < 0) {
return NULL;
}
if (find_name(PDH_ID_PROCESS_IDX, pid, sizeof(pid) - 1) < 0) {
return NULL;
}
//time is same.
c_size = 0;
i_size = 0;
pdhStat = PdhEnumObjectItems_i (
NULL, // reserved
NULL, // local machine
processes, // object to enumerate
NULL, // pass in NULL buffers
&c_size, // and 0 length to get
NULL, // required size
&i_size, // of the buffers in chars
PERF_DETAIL_WIZARD, // counter detail level
0);
//ok, now we have enough to enumerate all processes
if (pdh_fail(pdhStat)) {
/* printf("Could not enumerate processes (1) error=%d", pdhStat); */
return NULL;
}
// use calloc because windows vista does not null terminate the instance names (allthough the docs says it will)
if ((instances = calloc(i_size, 1)) == NULL) {
/* printf("Could not allocate memory %d bytes", i_size); */
error = true;
goto end;
}
c_size = 0;
pdhStat = PdhEnumObjectItems_i (
NULL, // reserved
NULL, // local machine
processes, // object to enumerate
NULL, // pass in NULL buffers
&c_size, // and 0 length to get
instances, // required size
&i_size, // of the buffers in chars
PERF_DETAIL_WIZARD, // counter detail level
0);
// ok, now we have enough to enumerate all processes
if (pdh_fail(pdhStat)) {
/* printf("Could not enumerate processes (2) error=%d", pdhStat); */
error = true;
goto end;
}
if (PdhOpenQuery_i(NULL, 0, &tmpQuery) != ERROR_SUCCESS) {
/* printf("Could not create temporary query"); */
error = true;
goto end;
}
// Find our module name and use it to extract the instance name used by PDH
if (GetModuleFileName(NULL, module_name, MAX_PATH) >= MAX_PATH-1) {
/* printf("Module name truncated"); */
error = true;
goto end;
}
instance_name = strrchr(module_name, '\\'); //drop path
instance_name++; //skip slash
dot_pos = strchr(instance_name, '.'); //drop .exe
dot_pos[0] = '\0';
//now, fetch the counters.
for (tmp = instances; *tmp != 0 && !error; tmp = &tmp[lstrlen(tmp)+1]) {
HCOUNTER hc = NULL;
BOOL done = false;
// Skip until we find our own process name
if (strcmp(tmp, instance_name) != 0) {
continue;
}
// iterate over all instance indexes and try to find our own pid
for (i = 0; !done && !error; i++){
PDH_STATUS res;
_snprintf(counter, sizeof(counter)-1, "\\%s(%s#%d)\\%s", processes, tmp, i, pid);
if (PdhAddCounter_i(tmpQuery, counter, 0, &hc) != ERROR_SUCCESS) {
/* printf("Failed to create process id query"); */
error = true;
goto end;
}
res = PdhCollectQueryData_i(tmpQuery);
if (res == PDH_INVALID_HANDLE) {
/* printf("Failed to query process id"); */
res = -1;
done = true;
} else if (res == PDH_NO_DATA) {
done = true;
} else {
PDH_FMT_COUNTERVALUE cv;
PdhGetFormattedCounterValue_i(hc, PDH_FMT_LONG, NULL, &cv);
/*
* This check seems to be needed for Win2k SMP boxes, since
* they for some reason don't return PDH_NO_DATA for non existing
* counters.
*/
if (cv.CStatus != PDH_CSTATUS_VALID_DATA) {
done = true;
} else if (cv.longValue == myPid) {
_snprintf(hotspotheader, sizeof(hotspotheader)-1, "\\%s(%s#%d)\0", processes, tmp, i);
PdhRemoveCounter_i(hc);
goto end;
}
}
PdhRemoveCounter_i(hc);
}
}
end:
if (instances != NULL) {
free(instances);
}
if (tmpQuery != NULL) {
PdhCloseQuery_i(tmpQuery);
}
if (error) {
return NULL;
}
return hotspotheader;
}
/**
* Returns the PDH string prefix identifying the HotSpot process. Use this prefix when getting
* counters from the PDH process object representing HotSpot.
*
* Note: this call may take some time to complete.
*
* @param ebuf error buffer.
* @param elen error buffer length.
*
* @return the header to be used when retrieving PDH counters from the HotSpot process.
* Will return NULL if the call failed.
*/
static char *
getProcessPDHHeader(void) {
static char *processHeader = NULL;
EnterCriticalSection(&processHeaderLock); {
if (processHeader == NULL) {
processHeader = initProcessPDHHeader();
}
} LeaveCriticalSection(&processHeaderLock);
return processHeader;
}
int perfInit(void);
double
perfGetCPULoad(int which)
{
PDH_FMT_COUNTERVALUE cv;
HCOUNTER c;
if (perfInit() < 0) {
// warn?
return -1.0;
}
if (multiCounterCPULoad.query.query == NULL) {
// warn?
return -1.0;
}
if (which == -1) {
c = multiCounterCPULoad.counters[multiCounterCPULoad.noOfCounters - 1];
} else {
if (which < multiCounterCPULoad.noOfCounters) {
c = multiCounterCPULoad.counters[which];
} else {
return -1.0;
}
}
if (getPerformanceData(&multiCounterCPULoad.query, c, &cv, PDH_FMT_DOUBLE ) == CONFIG_SUCCESSFUL) {
return cv.doubleValue / 100;
}
return -1.0;
}
double
perfGetProcessLoad(void)
{
PDH_FMT_COUNTERVALUE cv;
if (perfInit() < 0) {
// warn?
return -1.0;
}
if (cntProcLoad.query.query == NULL) {
// warn?
return -1.0;
}
if (getPerformanceData(&cntProcLoad.query, cntProcLoad.counter, &cv, PDH_FMT_DOUBLE | PDH_FMT_NOCAP100) == CONFIG_SUCCESSFUL) {
double d = cv.doubleValue / cpuFactor;
d = min(1, d);
d = max(0, d);
return d;
}
return -1.0;
}
/**
* Helper to initialize the PDH library. Loads the library and sets up the functions.
* Note that once loaded, we will never unload the PDH library.
*
* @return CONFIG_SUCCESSFUL if successful, negative on failure.
*/
int
perfInit(void) {
static HMODULE h;
static BOOL running, inited;
int error;
if (running) {
return CONFIG_SUCCESSFUL;
}
error = CONFIG_SUCCESSFUL;
// this is double checked locking again, but we try to bypass the worst by
// implicit membar at end of lock.
EnterCriticalSection(&initializationLock); {
if (!inited) {
char buf[64] = "";
SYSTEM_INFO si;
// CMH. But windows will not care about our affinity when giving
// us measurements. Need the real, raw num cpus.
GetSystemInfo(&si);
num_cpus = si.dwNumberOfProcessors;
// Initialize the denominator for the jvm load calculations
cpuFactor = num_cpus * 100;
/**
* Do this dynamically, so we don't fail to start on systems without pdh.
*/
if ((h = LoadLibrary("pdh.dll")) == NULL) {
/* printf("Could not load pdh.dll (%d)", GetLastError()); */
error = -2;
} else if (get_functions(h, buf, sizeof(buf)) < 0) {
FreeLibrary(h);
h = NULL;
error = -2;
/* printf("Failed to init pdh functions: %s.\n", buf); */
} else {
if (initProcessorCounters() != 0) {
/* printf("Failed to init system load counters.\n"); */
} else if (initProcLoadCounter() != 0) {
/* printf("Failed to init process load counter.\n"); */
} else if (initProcSystemLoadCounter() != 0) {
/* printf("Failed to init process system load counter.\n"); */
} else {
inited = true;
}
}
}
} LeaveCriticalSection(&initializationLock);
if (inited && error == CONFIG_SUCCESSFUL) {
running = true;
}
return error;
}
JNIEXPORT jdouble JNICALL
Java_sun_management_OperatingSystemImpl_getSystemCpuLoad
(JNIEnv *env, jobject dummy)
{
return perfGetCPULoad(-1);
}
JNIEXPORT jdouble JNICALL
Java_sun_management_OperatingSystemImpl_getProcessCpuLoad
(JNIEnv *env, jobject dummy)
{
return perfGetProcessLoad();
}
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