tools/gator/daemon/UserSpaceSource.cpp

   1 /**
   2  * Copyright (C) ARM Limited 2010-2015. All rights reserved.
   3  *
   4  * This program is free software; you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License version 2 as
   6  * published by the Free Software Foundation.
   7  */
   8
   9 #define __STDC_FORMAT_MACROS
  10
  11 #include "UserSpaceSource.h"
  12
  13 #include <inttypes.h>
  14 #include <sys/prctl.h>
  15 #include <unistd.h>
  16
  17 #include "Child.h"
  18 #include "DriverSource.h"
  19 #include "Logging.h"
  20 #include "SessionData.h"
  21
  22 extern Child *child;
  23
  24 UserSpaceSource::UserSpaceSource(sem_t *senderSem) : mBuffer(0, FRAME_BLOCK_COUNTER, gSessionData->mTotalBufferSize*1024*1024, senderSem) {
  25 }
  26
  27 UserSpaceSource::~UserSpaceSource() {
  28 }
  29
  30 bool UserSpaceSource::prepare() {
  31         return true;
  32 }
  33
  34 void UserSpaceSource::run() {
  35         prctl(PR_SET_NAME, (unsigned long)&"gatord-counters", 0, 0, 0);
  36
  37         for (int i = 0; i < ARRAY_LENGTH(gSessionData->usDrivers); ++i) {
  38                 gSessionData->usDrivers[i]->start();
  39         }
  40
  41         int64_t monotonicStarted = 0;
  42         while (monotonicStarted <= 0 && gSessionData->mSessionIsActive) {
  43                 usleep(10);
  44
  45                 if (gSessionData->perf.isSetup()) {
  46                         monotonicStarted = gSessionData->mMonotonicStarted;
  47                 } else {
  48                         if (DriverSource::readInt64Driver("/dev/gator/started", &monotonicStarted) == -1) {
  49                                 logg->logError("Error reading gator driver start time");
  50                                 handleException();
  51                         }
  52                         gSessionData->mMonotonicStarted = monotonicStarted;
  53                 }
  54         }
  55
  56         uint64_t nextTime = 0;
  57         while (gSessionData->mSessionIsActive) {
  58                 const uint64_t currTime = getTime() - monotonicStarted;
  59                 // Sample ten times a second ignoring gSessionData->mSampleRate
  60                 nextTime += NS_PER_S/10;//gSessionData->mSampleRate;
  61                 if (nextTime < currTime) {
  62                         logg->logMessage("Too slow, currTime: %" PRIi64 " nextTime: %" PRIi64, currTime, nextTime);
  63                         nextTime = currTime;
  64                 }
  65
  66                 if (mBuffer.eventHeader(currTime)) {
  67                         for (int i = 0; i < ARRAY_LENGTH(gSessionData->usDrivers); ++i) {
  68                                 gSessionData->usDrivers[i]->read(&mBuffer);
  69                         }
  70                         // Only check after writing all counters so that time and corresponding counters appear in the same frame
  71                         mBuffer.check(currTime);
  72                 }
  73
  74                 if (gSessionData->mOneShot && gSessionData->mSessionIsActive && (mBuffer.bytesAvailable() <= 0)) {
  75                         logg->logMessage("One shot (counters)");
  76                         child->endSession();
  77                 }
  78
  79                 usleep((nextTime - currTime)/NS_PER_US);
  80         }
  81
  82         mBuffer.setDone();
  83 }
  84
  85 void UserSpaceSource::interrupt() {
  86         // Do nothing
  87 }
  88
  89 bool UserSpaceSource::isDone() {
  90         return mBuffer.isDone();
  91 }
  92
  93 void UserSpaceSource::write(Sender *sender) {
  94         if (!mBuffer.isDone()) {
  95                 mBuffer.write(sender);
  96         }
  97 }