diff options
Diffstat (limited to 'daemon/FtraceSource.cpp')
| -rw-r--r-- | daemon/FtraceSource.cpp | 188 |
1 files changed, 0 insertions, 188 deletions
diff --git a/daemon/FtraceSource.cpp b/daemon/FtraceSource.cpp deleted file mode 100644 index 14a48b3..0000000 --- a/daemon/FtraceSource.cpp +++ /dev/null @@ -1,188 +0,0 @@ -/** - * Copyright (C) ARM Limited 2010-2015. All rights reserved. - * - * This program is free software; you can redistribute it and/or modify - * it under the terms of the GNU General Public License version 2 as - * published by the Free Software Foundation. - */ - -#include "FtraceSource.h" - -#include <fcntl.h> -#include <signal.h> -#include <sys/prctl.h> -#include <sys/syscall.h> -#include <unistd.h> - -#include "Child.h" -#include "DriverSource.h" -#include "Logging.h" -#include "SessionData.h" - -extern Child *child; - -static void handler(int signum) -{ - (void)signum; -}; - -FtraceSource::FtraceSource(sem_t *senderSem) : mFtraceFh(NULL), mBuffer(0, FRAME_BLOCK_COUNTER, 128*1024, senderSem), mTid(-1), mTracingOn(0) { -} - -FtraceSource::~FtraceSource() { -} - -bool FtraceSource::prepare() { - { - struct sigaction act; - act.sa_handler = handler; - act.sa_flags = (int)SA_RESETHAND; - if (sigaction(SIGUSR1, &act, NULL) != 0) { - logg->logError("sigaction failed: %s\n", strerror(errno)); - handleException(); - } - } - - gSessionData->ftraceDriver.prepare(); - - if (DriverSource::readIntDriver("/sys/kernel/debug/tracing/tracing_on", &mTracingOn)) { - logg->logError("Unable to read if ftrace is enabled"); - handleException(); - } - - if (DriverSource::writeDriver("/sys/kernel/debug/tracing/tracing_on", "0") != 0) { - logg->logError("Unable to turn ftrace off before truncating the buffer"); - handleException(); - } - - { - int fd; - fd = open("/sys/kernel/debug/tracing/trace", O_WRONLY | O_TRUNC | O_CLOEXEC, 0666); - if (fd < 0) { - logg->logError("Unable truncate ftrace buffer: %s", strerror(errno)); - handleException(); - } - close(fd); - } - - if (DriverSource::writeDriver("/sys/kernel/debug/tracing/trace_clock", "perf") != 0) { - logg->logError("Unable to switch ftrace to the perf clock, please ensure you are running Linux 3.10 or later"); - handleException(); - } - - mFtraceFh = fopen_cloexec("/sys/kernel/debug/tracing/trace_pipe", "rb"); - if (mFtraceFh == NULL) { - logg->logError("Unable to open trace_pipe"); - handleException(); - } - - return true; -} - -void FtraceSource::run() { - prctl(PR_SET_NAME, (unsigned long)&"gatord-ftrace", 0, 0, 0); - mTid = syscall(__NR_gettid); - - if (DriverSource::writeDriver("/sys/kernel/debug/tracing/tracing_on", "1") != 0) { - logg->logError("Unable to turn ftrace on"); - handleException(); - } - - // Wait until monotonicStarted is set before sending data - int64_t monotonicStarted = 0; - while (monotonicStarted <= 0 && gSessionData->mSessionIsActive) { - usleep(10); - - if (gSessionData->perf.isSetup()) { - monotonicStarted = gSessionData->mMonotonicStarted; - } else { - if (DriverSource::readInt64Driver("/dev/gator/started", &monotonicStarted) == -1) { - logg->logError("Error reading gator driver start time"); - handleException(); - } - } - } - - while (gSessionData->mSessionIsActive) { - char buf[1<<12]; - - if (fgets(buf, sizeof(buf), mFtraceFh) == NULL) { - if (errno == EINTR) { - // Interrupted by interrupt - likely user request to terminate - break; - } - logg->logError("Unable read trace data: %s", strerror(errno)); - handleException(); - } - - const uint64_t currTime = getTime() - gSessionData->mMonotonicStarted; - - char *const colon = strstr(buf, ": "); - if (colon == NULL) { - if (strstr(buf, " [LOST ") != NULL) { - logg->logError("Ftrace events lost, aborting the capture. It is recommended to discard this report and collect a new capture. If this error occurs often, please reduce the number of ftrace counters selected or the amount of ftrace events generated."); - } else { - logg->logError("Unable to find colon: %s", buf); - } - handleException(); - } - *colon = '\0'; - - char *const space = strrchr(buf, ' '); - if (space == NULL) { - logg->logError("Unable to find space: %s", buf); - handleException(); - } - *colon = ':'; - - int64_t *data = NULL; - int count = gSessionData->ftraceDriver.read(colon + 2, &data); - if (count > 0) { - errno = 0; - const long long time = strtod(space, NULL) * 1000000000; - if (errno != 0) { - logg->logError("Unable to parse time: %s", strerror(errno)); - handleException(); - } - mBuffer.event64(-1, time); - - for (int i = 0; i < count; ++i) { - mBuffer.event64(data[2*i + 0], data[2*i + 1]); - } - - mBuffer.check(currTime); - - if (gSessionData->mOneShot && gSessionData->mSessionIsActive && (mBuffer.bytesAvailable() <= 0)) { - logg->logMessage("One shot (ftrace)"); - child->endSession(); - } - } - - } - - mBuffer.setDone(); - - DriverSource::writeDriver("/sys/kernel/debug/tracing/tracing_on", mTracingOn); - fclose(mFtraceFh); - DriverSource::writeDriver("/sys/kernel/debug/tracing/trace_clock", "local"); - gSessionData->ftraceDriver.stop(); -} - -void FtraceSource::interrupt() { - // Closing the underlying file handle does not result in the read on the ftrace file handle to return, so send a signal to the thread - syscall(__NR_tgkill, getpid(), mTid, SIGUSR1); -} - -bool FtraceSource::isDone() { - return mBuffer.isDone(); -} - -void FtraceSource::write(Sender *sender) { - // Don't send ftrace data until the summary packet is sent so that monotonic delta is available - if (!gSessionData->mSentSummary) { - return; - } - if (!mBuffer.isDone()) { - mBuffer.write(sender); - } -} |