VirtualBox

source: vbox/trunk/src/VBox/Main/Performance.cpp@ 30764

Last change on this file since 30764 was 30764, checked in by vboxsync, 14 years ago

back out r63543, r63544 until windows build problems can be solved properly

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1/* $Id: Performance.cpp 30764 2010-07-09 14:12:12Z vboxsync $ */
2
3/** @file
4 *
5 * VBox Performance Classes implementation.
6 */
7
8/*
9 * Copyright (C) 2008 Oracle Corporation
10 *
11 * This file is part of VirtualBox Open Source Edition (OSE), as
12 * available from http://www.virtualbox.org. This file is free software;
13 * you can redistribute it and/or modify it under the terms of the GNU
14 * General Public License (GPL) as published by the Free Software
15 * Foundation, in version 2 as it comes in the "COPYING" file of the
16 * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
17 * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
18 */
19
20/*
21 * @todo list:
22 *
23 * 1) Detection of erroneous metric names
24 */
25
26#ifndef VBOX_COLLECTOR_TEST_CASE
27#include "VirtualBoxImpl.h"
28#include "MachineImpl.h"
29#endif
30#include "Performance.h"
31
32#include <VBox/com/array.h>
33#include <VBox/com/ptr.h>
34#include <VBox/com/string.h>
35#include <VBox/err.h>
36#include <iprt/string.h>
37#include <iprt/mem.h>
38#include <iprt/cpuset.h>
39
40#include <algorithm>
41
42#include "Logging.h"
43
44using namespace pm;
45
46// Stubs for non-pure virtual methods
47
48int CollectorHAL::getHostCpuLoad(ULONG * /* user */, ULONG * /* kernel */, ULONG * /* idle */)
49{
50 return E_NOTIMPL;
51}
52
53int CollectorHAL::getProcessCpuLoad(RTPROCESS /* process */, ULONG * /* user */, ULONG * /* kernel */)
54{
55 return E_NOTIMPL;
56}
57
58int CollectorHAL::getRawHostCpuLoad(uint64_t * /* user */, uint64_t * /* kernel */, uint64_t * /* idle */)
59{
60 return E_NOTIMPL;
61}
62
63int CollectorHAL::getRawProcessCpuLoad(RTPROCESS /* process */, uint64_t * /* user */, uint64_t * /* kernel */, uint64_t * /* total */)
64{
65 return E_NOTIMPL;
66}
67
68int CollectorHAL::getHostMemoryUsage(ULONG * /* total */, ULONG * /* used */, ULONG * /* available */)
69{
70 return E_NOTIMPL;
71}
72
73int CollectorHAL::getProcessMemoryUsage(RTPROCESS /* process */, ULONG * /* used */)
74{
75 return E_NOTIMPL;
76}
77
78int CollectorHAL::enable()
79{
80 return E_NOTIMPL;
81}
82
83int CollectorHAL::disable()
84{
85 return E_NOTIMPL;
86}
87
88/* Generic implementations */
89
90int CollectorHAL::getHostCpuMHz(ULONG *mhz)
91{
92 unsigned cCpus = 0;
93 uint64_t u64TotalMHz = 0;
94 RTCPUSET OnlineSet;
95 RTMpGetOnlineSet(&OnlineSet);
96 for (RTCPUID iCpu = 0; iCpu < RTCPUSET_MAX_CPUS; iCpu++)
97 {
98 LogAleksey(("{%p} " LOG_FN_FMT ": Checking if CPU %d is member of online set...\n",
99 this, __PRETTY_FUNCTION__, (int)iCpu));
100 if (RTCpuSetIsMemberByIndex(&OnlineSet, iCpu))
101 {
102 LogAleksey(("{%p} " LOG_FN_FMT ": Getting frequency for CPU %d...\n",
103 this, __PRETTY_FUNCTION__, (int)iCpu));
104 uint32_t uMHz = RTMpGetCurFrequency(RTMpCpuIdFromSetIndex(iCpu));
105 if (uMHz != 0)
106 {
107 LogAleksey(("{%p} " LOG_FN_FMT ": CPU %d %u MHz\n",
108 this, __PRETTY_FUNCTION__, (int)iCpu, uMHz));
109 u64TotalMHz += uMHz;
110 cCpus++;
111 }
112 }
113 }
114
115 AssertReturn(cCpus, VERR_NOT_IMPLEMENTED);
116 *mhz = (ULONG)(u64TotalMHz / cCpus);
117
118 return VINF_SUCCESS;
119}
120
121#ifndef VBOX_COLLECTOR_TEST_CASE
122CollectorGuestHAL::~CollectorGuestHAL()
123{
124 Assert(!cEnabled);
125}
126
127int CollectorGuestHAL::enable()
128{
129 HRESULT ret = S_OK;
130
131 if (ASMAtomicIncU32(&cEnabled) == 1)
132 {
133 ComPtr<IInternalSessionControl> directControl;
134
135 ret = mMachine->getDirectControl(&directControl);
136 if (ret != S_OK)
137 return ret;
138
139 /* get the associated console; this is a remote call (!) */
140 ret = directControl->GetRemoteConsole(mConsole.asOutParam());
141 if (ret != S_OK)
142 return ret;
143
144 ret = mConsole->COMGETTER(Guest)(mGuest.asOutParam());
145 if (ret == S_OK)
146 mGuest->COMSETTER(StatisticsUpdateInterval)(1 /* 1 sec */);
147 }
148 return ret;
149}
150
151int CollectorGuestHAL::disable()
152{
153 if (ASMAtomicDecU32(&cEnabled) == 0)
154 {
155 Assert(mGuest && mConsole);
156 mGuest->COMSETTER(StatisticsUpdateInterval)(0 /* off */);
157 }
158 return S_OK;
159}
160
161int CollectorGuestHAL::preCollect(const CollectorHints& /* hints */, uint64_t iTick)
162{
163 if ( mGuest
164 && iTick != mLastTick)
165 {
166 ULONG ulMemAllocTotal, ulMemFreeTotal, ulMemBalloonTotal, ulMemSharedTotal;
167
168 mGuest->InternalGetStatistics(&mCpuUser, &mCpuKernel, &mCpuIdle,
169 &mMemTotal, &mMemFree, &mMemBalloon, &mMemShared, &mMemCache,
170 &mPageTotal, &ulMemAllocTotal, &ulMemFreeTotal, &ulMemBalloonTotal, &ulMemSharedTotal);
171
172 if (mHostHAL)
173 mHostHAL->setMemHypervisorStats(ulMemAllocTotal, ulMemFreeTotal, ulMemBalloonTotal, ulMemSharedTotal);
174
175 mLastTick = iTick;
176 }
177 return S_OK;
178}
179
180#endif /* !VBOX_COLLECTOR_TEST_CASE */
181
182bool BaseMetric::collectorBeat(uint64_t nowAt)
183{
184 if (isEnabled())
185 {
186 if (nowAt - mLastSampleTaken >= mPeriod * 1000)
187 {
188 mLastSampleTaken = nowAt;
189 Log4(("{%p} " LOG_FN_FMT ": Collecting %s for obj(%p)...\n",
190 this, __PRETTY_FUNCTION__, getName(), (void *)mObject));
191 return true;
192 }
193 }
194 return false;
195}
196
197/*bool BaseMetric::associatedWith(ComPtr<IUnknown> object)
198{
199 LogFlowThisFunc(("mObject(%p) == object(%p) is %s.\n", mObject, object, mObject == object ? "true" : "false"));
200 return mObject == object;
201}*/
202
203void HostCpuLoad::init(ULONG period, ULONG length)
204{
205 mPeriod = period;
206 mLength = length;
207 mUser->init(mLength);
208 mKernel->init(mLength);
209 mIdle->init(mLength);
210}
211
212void HostCpuLoad::collect()
213{
214 ULONG user, kernel, idle;
215 int rc = mHAL->getHostCpuLoad(&user, &kernel, &idle);
216 if (RT_SUCCESS(rc))
217 {
218 mUser->put(user);
219 mKernel->put(kernel);
220 mIdle->put(idle);
221 }
222}
223
224void HostCpuLoadRaw::preCollect(CollectorHints& hints, uint64_t /* iTick */)
225{
226 hints.collectHostCpuLoad();
227}
228
229void HostCpuLoadRaw::collect()
230{
231 uint64_t user, kernel, idle;
232 uint64_t userDiff, kernelDiff, idleDiff, totalDiff;
233
234 int rc = mHAL->getRawHostCpuLoad(&user, &kernel, &idle);
235 if (RT_SUCCESS(rc))
236 {
237 userDiff = user - mUserPrev;
238 kernelDiff = kernel - mKernelPrev;
239 idleDiff = idle - mIdlePrev;
240 totalDiff = userDiff + kernelDiff + idleDiff;
241
242 if (totalDiff == 0)
243 {
244 /* This is only possible if none of counters has changed! */
245 LogFlowThisFunc(("Impossible! User, kernel and idle raw "
246 "counters has not changed since last sample.\n" ));
247 mUser->put(0);
248 mKernel->put(0);
249 mIdle->put(0);
250 }
251 else
252 {
253 mUser->put((ULONG)(PM_CPU_LOAD_MULTIPLIER * userDiff / totalDiff));
254 mKernel->put((ULONG)(PM_CPU_LOAD_MULTIPLIER * kernelDiff / totalDiff));
255 mIdle->put((ULONG)(PM_CPU_LOAD_MULTIPLIER * idleDiff / totalDiff));
256 }
257
258 mUserPrev = user;
259 mKernelPrev = kernel;
260 mIdlePrev = idle;
261 }
262}
263
264void HostCpuMhz::init(ULONG period, ULONG length)
265{
266 mPeriod = period;
267 mLength = length;
268 mMHz->init(mLength);
269}
270
271void HostCpuMhz::collect()
272{
273 ULONG mhz;
274 int rc = mHAL->getHostCpuMHz(&mhz);
275 if (RT_SUCCESS(rc))
276 mMHz->put(mhz);
277}
278
279void HostRamUsage::init(ULONG period, ULONG length)
280{
281 mPeriod = period;
282 mLength = length;
283 mTotal->init(mLength);
284 mUsed->init(mLength);
285 mAvailable->init(mLength);
286 mAllocVMM->init(mLength);
287 mFreeVMM->init(mLength);
288 mBalloonVMM->init(mLength);
289 mSharedVMM->init(mLength);
290}
291
292void HostRamUsage::preCollect(CollectorHints& hints, uint64_t /* iTick */)
293{
294 hints.collectHostRamUsage();
295}
296
297void HostRamUsage::collect()
298{
299 ULONG total, used, available;
300 int rc = mHAL->getHostMemoryUsage(&total, &used, &available);
301 if (RT_SUCCESS(rc))
302 {
303 mTotal->put(total);
304 mUsed->put(used);
305 mAvailable->put(available);
306
307 }
308 ULONG allocVMM, freeVMM, balloonVMM, sharedVMM;
309
310 mHAL->getMemHypervisorStats(&allocVMM, &freeVMM, &balloonVMM, &sharedVMM);
311 mAllocVMM->put(allocVMM);
312 mFreeVMM->put(freeVMM);
313 mBalloonVMM->put(balloonVMM);
314 mSharedVMM->put(sharedVMM);
315}
316
317
318
319void MachineCpuLoad::init(ULONG period, ULONG length)
320{
321 mPeriod = period;
322 mLength = length;
323 mUser->init(mLength);
324 mKernel->init(mLength);
325}
326
327void MachineCpuLoad::collect()
328{
329 ULONG user, kernel;
330 int rc = mHAL->getProcessCpuLoad(mProcess, &user, &kernel);
331 if (RT_SUCCESS(rc))
332 {
333 mUser->put(user);
334 mKernel->put(kernel);
335 }
336}
337
338void MachineCpuLoadRaw::preCollect(CollectorHints& hints, uint64_t /* iTick */)
339{
340 hints.collectProcessCpuLoad(mProcess);
341}
342
343void MachineCpuLoadRaw::collect()
344{
345 uint64_t processUser, processKernel, hostTotal;
346
347 int rc = mHAL->getRawProcessCpuLoad(mProcess, &processUser, &processKernel, &hostTotal);
348 if (RT_SUCCESS(rc))
349 {
350 if (hostTotal == mHostTotalPrev)
351 {
352 /* Nearly impossible, but... */
353 mUser->put(0);
354 mKernel->put(0);
355 }
356 else
357 {
358 mUser->put((ULONG)(PM_CPU_LOAD_MULTIPLIER * (processUser - mProcessUserPrev) / (hostTotal - mHostTotalPrev)));
359 mKernel->put((ULONG)(PM_CPU_LOAD_MULTIPLIER * (processKernel - mProcessKernelPrev ) / (hostTotal - mHostTotalPrev)));
360 }
361
362 mHostTotalPrev = hostTotal;
363 mProcessUserPrev = processUser;
364 mProcessKernelPrev = processKernel;
365 }
366}
367
368void MachineRamUsage::init(ULONG period, ULONG length)
369{
370 mPeriod = period;
371 mLength = length;
372 mUsed->init(mLength);
373}
374
375void MachineRamUsage::preCollect(CollectorHints& hints, uint64_t /* iTick */)
376{
377 hints.collectProcessRamUsage(mProcess);
378}
379
380void MachineRamUsage::collect()
381{
382 ULONG used;
383 int rc = mHAL->getProcessMemoryUsage(mProcess, &used);
384 if (RT_SUCCESS(rc))
385 mUsed->put(used);
386}
387
388
389void GuestCpuLoad::init(ULONG period, ULONG length)
390{
391 mPeriod = period;
392 mLength = length;
393
394 mUser->init(mLength);
395 mKernel->init(mLength);
396 mIdle->init(mLength);
397}
398
399void GuestCpuLoad::preCollect(CollectorHints& hints, uint64_t iTick)
400{
401 mHAL->preCollect(hints, iTick);
402}
403
404void GuestCpuLoad::collect()
405{
406 ULONG CpuUser = 0, CpuKernel = 0, CpuIdle = 0;
407
408 mGuestHAL->getGuestCpuLoad(&CpuUser, &CpuKernel, &CpuIdle);
409 mUser->put((ULONG)(PM_CPU_LOAD_MULTIPLIER * CpuUser) / 100);
410 mKernel->put((ULONG)(PM_CPU_LOAD_MULTIPLIER * CpuKernel) / 100);
411 mIdle->put((ULONG)(PM_CPU_LOAD_MULTIPLIER * CpuIdle) / 100);
412}
413
414void GuestRamUsage::init(ULONG period, ULONG length)
415{
416 mPeriod = period;
417 mLength = length;
418
419 mTotal->init(mLength);
420 mFree->init(mLength);
421 mBallooned->init(mLength);
422 mShared->init(mLength);
423 mCache->init(mLength);
424 mPagedTotal->init(mLength);
425}
426
427void GuestRamUsage::preCollect(CollectorHints& hints, uint64_t iTick)
428{
429 mHAL->preCollect(hints, iTick);
430}
431
432void GuestRamUsage::collect()
433{
434 ULONG ulMemTotal = 0, ulMemFree = 0, ulMemBalloon = 0, ulMemShared = 0, ulMemCache = 0, ulPageTotal = 0;
435
436 mGuestHAL->getGuestMemLoad(&ulMemTotal, &ulMemFree, &ulMemBalloon, &ulMemShared, &ulMemCache, &ulPageTotal);
437 mTotal->put(ulMemTotal);
438 mFree->put(ulMemFree);
439 mBallooned->put(ulMemBalloon);
440 mShared->put(ulMemShared);
441 mCache->put(ulMemCache);
442 mPagedTotal->put(ulPageTotal);
443}
444
445void CircularBuffer::init(ULONG ulLength)
446{
447 if (mData)
448 RTMemFree(mData);
449 mLength = ulLength;
450 if (mLength)
451 mData = (ULONG*)RTMemAllocZ(ulLength * sizeof(ULONG));
452 else
453 mData = NULL;
454 mWrapped = false;
455 mEnd = 0;
456 mSequenceNumber = 0;
457}
458
459ULONG CircularBuffer::length()
460{
461 return mWrapped ? mLength : mEnd;
462}
463
464void CircularBuffer::put(ULONG value)
465{
466 if (mData)
467 {
468 mData[mEnd++] = value;
469 if (mEnd >= mLength)
470 {
471 mEnd = 0;
472 mWrapped = true;
473 }
474 ++mSequenceNumber;
475 }
476}
477
478void CircularBuffer::copyTo(ULONG *data)
479{
480 if (mWrapped)
481 {
482 memcpy(data, mData + mEnd, (mLength - mEnd) * sizeof(ULONG));
483 // Copy the wrapped part
484 if (mEnd)
485 memcpy(data + (mLength - mEnd), mData, mEnd * sizeof(ULONG));
486 }
487 else
488 memcpy(data, mData, mEnd * sizeof(ULONG));
489}
490
491void SubMetric::query(ULONG *data)
492{
493 copyTo(data);
494}
495
496void Metric::query(ULONG **data, ULONG *count, ULONG *sequenceNumber)
497{
498 ULONG length;
499 ULONG *tmpData;
500
501 length = mSubMetric->length();
502 *sequenceNumber = mSubMetric->getSequenceNumber() - length;
503 if (length)
504 {
505 tmpData = (ULONG*)RTMemAlloc(sizeof(*tmpData)*length);
506 mSubMetric->query(tmpData);
507 if (mAggregate)
508 {
509 *count = 1;
510 *data = (ULONG*)RTMemAlloc(sizeof(**data));
511 **data = mAggregate->compute(tmpData, length);
512 RTMemFree(tmpData);
513 }
514 else
515 {
516 *count = length;
517 *data = tmpData;
518 }
519 }
520 else
521 {
522 *count = 0;
523 *data = 0;
524 }
525}
526
527ULONG AggregateAvg::compute(ULONG *data, ULONG length)
528{
529 uint64_t tmp = 0;
530 for (ULONG i = 0; i < length; ++i)
531 tmp += data[i];
532 return (ULONG)(tmp / length);
533}
534
535const char * AggregateAvg::getName()
536{
537 return "avg";
538}
539
540ULONG AggregateMin::compute(ULONG *data, ULONG length)
541{
542 ULONG tmp = *data;
543 for (ULONG i = 0; i < length; ++i)
544 if (data[i] < tmp)
545 tmp = data[i];
546 return tmp;
547}
548
549const char * AggregateMin::getName()
550{
551 return "min";
552}
553
554ULONG AggregateMax::compute(ULONG *data, ULONG length)
555{
556 ULONG tmp = *data;
557 for (ULONG i = 0; i < length; ++i)
558 if (data[i] > tmp)
559 tmp = data[i];
560 return tmp;
561}
562
563const char * AggregateMax::getName()
564{
565 return "max";
566}
567
568Filter::Filter(ComSafeArrayIn(IN_BSTR, metricNames),
569 ComSafeArrayIn(IUnknown *, objects))
570{
571 /*
572 * Let's work around null/empty safe array mess. I am not sure there is
573 * a way to pass null arrays via webservice, I haven't found one. So I
574 * guess the users will be forced to use empty arrays instead. Constructing
575 * an empty SafeArray is a bit awkward, so what we do in this method is
576 * actually convert null arrays to empty arrays and pass them down to
577 * init() method. If someone knows how to do it better, please be my guest,
578 * fix it.
579 */
580 if (ComSafeArrayInIsNull(metricNames))
581 {
582 com::SafeArray<BSTR> nameArray;
583 if (ComSafeArrayInIsNull(objects))
584 {
585 com::SafeIfaceArray<IUnknown> objectArray;
586 objectArray.reset(0);
587 init(ComSafeArrayAsInParam(nameArray),
588 ComSafeArrayAsInParam(objectArray));
589 }
590 else
591 {
592 com::SafeIfaceArray<IUnknown> objectArray(ComSafeArrayInArg(objects));
593 init(ComSafeArrayAsInParam(nameArray),
594 ComSafeArrayAsInParam(objectArray));
595 }
596 }
597 else
598 {
599 com::SafeArray<IN_BSTR> nameArray(ComSafeArrayInArg(metricNames));
600 if (ComSafeArrayInIsNull(objects))
601 {
602 com::SafeIfaceArray<IUnknown> objectArray;
603 objectArray.reset(0);
604 init(ComSafeArrayAsInParam(nameArray),
605 ComSafeArrayAsInParam(objectArray));
606 }
607 else
608 {
609 com::SafeIfaceArray<IUnknown> objectArray(ComSafeArrayInArg(objects));
610 init(ComSafeArrayAsInParam(nameArray),
611 ComSafeArrayAsInParam(objectArray));
612 }
613 }
614}
615
616void Filter::init(ComSafeArrayIn(IN_BSTR, metricNames),
617 ComSafeArrayIn(IUnknown *, objects))
618{
619 com::SafeArray<IN_BSTR> nameArray(ComSafeArrayInArg(metricNames));
620 com::SafeIfaceArray<IUnknown> objectArray(ComSafeArrayInArg(objects));
621
622 if (!objectArray.size())
623 {
624 if (nameArray.size())
625 {
626 for (size_t i = 0; i < nameArray.size(); ++i)
627 processMetricList(com::Utf8Str(nameArray[i]), ComPtr<IUnknown>());
628 }
629 else
630 processMetricList("*", ComPtr<IUnknown>());
631 }
632 else
633 {
634 for (size_t i = 0; i < objectArray.size(); ++i)
635 switch (nameArray.size())
636 {
637 case 0:
638 processMetricList("*", objectArray[i]);
639 break;
640 case 1:
641 processMetricList(com::Utf8Str(nameArray[0]), objectArray[i]);
642 break;
643 default:
644 processMetricList(com::Utf8Str(nameArray[i]), objectArray[i]);
645 break;
646 }
647 }
648}
649
650void Filter::processMetricList(const com::Utf8Str &name, const ComPtr<IUnknown> object)
651{
652 size_t startPos = 0;
653
654 for (size_t pos = name.find(",");
655 pos != com::Utf8Str::npos;
656 pos = name.find(",", startPos))
657 {
658 mElements.push_back(std::make_pair(object, iprt::MiniString(name.substr(startPos, pos - startPos).c_str())));
659 startPos = pos + 1;
660 }
661 mElements.push_back(std::make_pair(object, iprt::MiniString(name.substr(startPos).c_str())));
662}
663
664/**
665 * The following method was borrowed from stamR3Match (VMM/STAM.cpp) and
666 * modified to handle the special case of trailing colon in the pattern.
667 *
668 * @returns True if matches, false if not.
669 * @param pszPat Pattern.
670 * @param pszName Name to match against the pattern.
671 * @param fSeenColon Seen colon (':').
672 */
673bool Filter::patternMatch(const char *pszPat, const char *pszName,
674 bool fSeenColon)
675{
676 /* ASSUMES ASCII */
677 for (;;)
678 {
679 char chPat = *pszPat;
680 switch (chPat)
681 {
682 default:
683 if (*pszName != chPat)
684 return false;
685 break;
686
687 case '*':
688 {
689 while ((chPat = *++pszPat) == '*' || chPat == '?')
690 /* nothing */;
691
692 /* Handle a special case, the mask terminating with a colon. */
693 if (chPat == ':')
694 {
695 if (!fSeenColon && !pszPat[1])
696 return !strchr(pszName, ':');
697 fSeenColon = true;
698 }
699
700 for (;;)
701 {
702 char ch = *pszName++;
703 if ( ch == chPat
704 && ( !chPat
705 || patternMatch(pszPat + 1, pszName, fSeenColon)))
706 return true;
707 if (!ch)
708 return false;
709 }
710 /* won't ever get here */
711 break;
712 }
713
714 case '?':
715 if (!*pszName)
716 return false;
717 break;
718
719 /* Handle a special case, the mask terminating with a colon. */
720 case ':':
721 if (!fSeenColon && !pszPat[1])
722 return !*pszName;
723 if (*pszName != ':')
724 return false;
725 fSeenColon = true;
726 break;
727
728 case '\0':
729 return !*pszName;
730 }
731 pszName++;
732 pszPat++;
733 }
734 return true;
735}
736
737bool Filter::match(const ComPtr<IUnknown> object, const iprt::MiniString &name) const
738{
739 ElementList::const_iterator it;
740
741 LogAleksey(("Filter::match(%p, %s)\n", static_cast<const IUnknown*> (object), name.c_str()));
742 for (it = mElements.begin(); it != mElements.end(); it++)
743 {
744 LogAleksey(("...matching against(%p, %s)\n", static_cast<const IUnknown*> ((*it).first), (*it).second.c_str()));
745 if ((*it).first.isNull() || (*it).first == object)
746 {
747 // Objects match, compare names
748 if (patternMatch((*it).second.c_str(), name.c_str()))
749 {
750 LogFlowThisFunc(("...found!\n"));
751 return true;
752 }
753 }
754 }
755 LogAleksey(("...no matches!\n"));
756 return false;
757}
758/* vi: set tabstop=4 shiftwidth=4 expandtab: */
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