1f2d49a8e7
- Add a warnings field in the jLLDBGetState response, for warnings to be delivered to the client for troubleshooting. This removes the need to silently log lldb-server's llvm::Errors and not expose them easily to the user - Simplify the tscPerfZeroConversion struct and schema. It used to extend a base abstract class, but I'm doubting that we'll ever add other conversion mechanisms because all modern kernels support perf zero. It is also the one who is supposed to work with the timestamps produced by the context switch trace, so expecting it is imperative. - Force tsc collection for cpu tracing. - Add a test checking that tscPerfZeroConversion is returned by the GetState request - Add a pre-check for cpu tracing that makes sure that perf zero values are available. Differential Revision: https://reviews.llvm.org/D125932
99 lines
3.0 KiB
C++
99 lines
3.0 KiB
C++
//===-- IntelPTCollector.h ------------------------------------ -*- C++ -*-===//
|
|
//
|
|
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
|
|
// See https://llvm.org/LICENSE.txt for license information.
|
|
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
#ifndef liblldb_IntelPTCollector_H_
|
|
#define liblldb_IntelPTCollector_H_
|
|
|
|
#include "Perf.h"
|
|
|
|
#include "IntelPTMultiCoreTrace.h"
|
|
#include "IntelPTPerThreadProcessTrace.h"
|
|
#include "IntelPTSingleBufferTrace.h"
|
|
|
|
#include "lldb/Host/common/NativeProcessProtocol.h"
|
|
#include "lldb/Utility/Status.h"
|
|
#include "lldb/Utility/TraceIntelPTGDBRemotePackets.h"
|
|
#include "lldb/lldb-types.h"
|
|
|
|
#include <linux/perf_event.h>
|
|
#include <sys/mman.h>
|
|
#include <unistd.h>
|
|
|
|
namespace lldb_private {
|
|
|
|
namespace process_linux {
|
|
|
|
/// Main class that manages intel-pt process and thread tracing.
|
|
class IntelPTCollector {
|
|
public:
|
|
/// \param[in] process
|
|
/// Process to be traced.
|
|
IntelPTCollector(NativeProcessProtocol &process);
|
|
|
|
static bool IsSupported();
|
|
|
|
/// To be invoked as soon as we know the process stopped.
|
|
void ProcessDidStop();
|
|
|
|
/// To be invoked before the process will resume, so that we can capture the
|
|
/// first instructions after the resume.
|
|
void ProcessWillResume();
|
|
|
|
/// If "process tracing" is enabled, then trace the given thread.
|
|
llvm::Error OnThreadCreated(lldb::tid_t tid);
|
|
|
|
/// Stops tracing a tracing upon a destroy event.
|
|
llvm::Error OnThreadDestroyed(lldb::tid_t tid);
|
|
|
|
/// Implementation of the jLLDBTraceStop packet
|
|
llvm::Error TraceStop(const TraceStopRequest &request);
|
|
|
|
/// Implementation of the jLLDBTraceStart packet
|
|
llvm::Error TraceStart(const TraceIntelPTStartRequest &request);
|
|
|
|
/// Implementation of the jLLDBTraceGetState packet
|
|
llvm::Expected<llvm::json::Value> GetState();
|
|
|
|
/// Implementation of the jLLDBTraceGetBinaryData packet
|
|
llvm::Expected<std::vector<uint8_t>>
|
|
GetBinaryData(const TraceGetBinaryDataRequest &request);
|
|
|
|
/// Dispose of all traces
|
|
void Clear();
|
|
|
|
private:
|
|
llvm::Error TraceStop(lldb::tid_t tid);
|
|
|
|
/// Start tracing a specific thread.
|
|
llvm::Error TraceStart(lldb::tid_t tid,
|
|
const TraceIntelPTStartRequest &request);
|
|
|
|
/// \return
|
|
/// The conversion object between TSC and wall time. It caches the result
|
|
/// upon success.
|
|
llvm::Expected<LinuxPerfZeroTscConversion &>
|
|
FetchPerfTscConversionParameters();
|
|
|
|
/// The target process.
|
|
NativeProcessProtocol &m_process;
|
|
/// Threads traced due to "thread tracing"
|
|
IntelPTThreadTraceCollection m_thread_traces;
|
|
|
|
/// Only one instance of "process trace" can be active at a given time.
|
|
/// It might be \b nullptr.
|
|
IntelPTProcessTraceUP m_process_trace_up;
|
|
|
|
/// Cached TSC to and from wall time conversion.
|
|
llvm::Optional<LinuxPerfZeroTscConversion> m_cached_tsc_conversion;
|
|
};
|
|
|
|
} // namespace process_linux
|
|
} // namespace lldb_private
|
|
|
|
#endif // liblldb_IntelPTCollector_H_
|