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to reflect the new license. We understand that people may be surprised that we're moving the header entirely to discuss the new license. We checked this carefully with the Foundation's lawyer and we believe this is the correct approach. Essentially, all code in the project is now made available by the LLVM project under our new license, so you will see that the license headers include that license only. Some of our contributors have contributed code under our old license, and accordingly, we have retained a copy of our old license notice in the top-level files in each project and repository. llvm-svn: 351636
140 lines
3.7 KiB
C++
140 lines
3.7 KiB
C++
//===-- PerfHelper.cpp ------------------------------------------*- C++ -*-===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#include "PerfHelper.h"
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#include "llvm/Config/config.h"
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#include "llvm/Support/raw_ostream.h"
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#ifdef HAVE_LIBPFM
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#include "perfmon/perf_event.h"
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#include "perfmon/pfmlib.h"
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#include "perfmon/pfmlib_perf_event.h"
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#endif
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#include <cassert>
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namespace llvm {
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namespace exegesis {
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namespace pfm {
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#ifdef HAVE_LIBPFM
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static bool isPfmError(int Code) { return Code != PFM_SUCCESS; }
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#endif
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bool pfmInitialize() {
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#ifdef HAVE_LIBPFM
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return isPfmError(pfm_initialize());
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#else
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return true;
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#endif
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}
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void pfmTerminate() {
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#ifdef HAVE_LIBPFM
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pfm_terminate();
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#endif
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}
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PerfEvent::~PerfEvent() {
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#ifdef HAVE_LIBPFM
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delete Attr;
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;
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#endif
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}
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PerfEvent::PerfEvent(PerfEvent &&Other)
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: EventString(std::move(Other.EventString)),
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FullQualifiedEventString(std::move(Other.FullQualifiedEventString)),
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Attr(Other.Attr) {
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Other.Attr = nullptr;
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}
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PerfEvent::PerfEvent(llvm::StringRef PfmEventString)
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: EventString(PfmEventString.str()), Attr(nullptr) {
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#ifdef HAVE_LIBPFM
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char *Fstr = nullptr;
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pfm_perf_encode_arg_t Arg = {};
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Attr = new perf_event_attr();
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Arg.attr = Attr;
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Arg.fstr = &Fstr;
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Arg.size = sizeof(pfm_perf_encode_arg_t);
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const int Result = pfm_get_os_event_encoding(EventString.c_str(), PFM_PLM3,
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PFM_OS_PERF_EVENT, &Arg);
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if (isPfmError(Result)) {
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// We don't know beforehand which counters are available (e.g. 6 uops ports
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// on Sandybridge but 8 on Haswell) so we report the missing counter without
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// crashing.
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llvm::errs() << pfm_strerror(Result) << " - cannot create event "
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<< EventString << "\n";
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}
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if (Fstr) {
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FullQualifiedEventString = Fstr;
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free(Fstr);
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}
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#endif
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}
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llvm::StringRef PerfEvent::name() const { return EventString; }
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bool PerfEvent::valid() const { return !FullQualifiedEventString.empty(); }
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const perf_event_attr *PerfEvent::attribute() const { return Attr; }
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llvm::StringRef PerfEvent::getPfmEventString() const {
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return FullQualifiedEventString;
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}
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#ifdef HAVE_LIBPFM
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Counter::Counter(const PerfEvent &Event) {
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assert(Event.valid());
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const pid_t Pid = 0; // measure current process/thread.
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const int Cpu = -1; // measure any processor.
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const int GroupFd = -1; // no grouping of counters.
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const uint32_t Flags = 0;
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perf_event_attr AttrCopy = *Event.attribute();
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FileDescriptor = perf_event_open(&AttrCopy, Pid, Cpu, GroupFd, Flags);
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if (FileDescriptor == -1) {
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llvm::errs() << "Unable to open event, make sure your kernel allows user "
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"space perf monitoring.\nYou may want to try:\n$ sudo sh "
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"-c 'echo -1 > /proc/sys/kernel/perf_event_paranoid'\n";
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}
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assert(FileDescriptor != -1 && "Unable to open event");
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}
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Counter::~Counter() { close(FileDescriptor); }
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void Counter::start() { ioctl(FileDescriptor, PERF_EVENT_IOC_RESET, 0); }
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void Counter::stop() { ioctl(FileDescriptor, PERF_EVENT_IOC_DISABLE, 0); }
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int64_t Counter::read() const {
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int64_t Count = 0;
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ssize_t ReadSize = ::read(FileDescriptor, &Count, sizeof(Count));
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if (ReadSize != sizeof(Count)) {
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Count = -1;
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llvm::errs() << "Failed to read event counter\n";
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}
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return Count;
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}
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#else
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Counter::Counter(const PerfEvent &Event) {}
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Counter::~Counter() = default;
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void Counter::start() {}
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void Counter::stop() {}
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int64_t Counter::read() const { return 42; }
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#endif
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} // namespace pfm
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} // namespace exegesis
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} // namespace llvm
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