fc5ef57c7d
:q! This diff is massive, but it's because it connects the client with lldb-server and also ensures that the postmortem case works. - Flatten the postmortem trace schema. The reason is that the schema has become quite complex due to the new multicore case, which defeats the original purpose of having a schema that could work for every trace plug-in. At this point, it's better that each trace plug-in defines it's own full schema. This means that the only common field is "type". -- Because of this new approach, I merged the "common" trace load and saving functionalities into the IntelPT one. This simplified the code quite a bit. If we eventually implement another trace plug-in, we can see then what we could reuse. -- The new schema, which is flattened, has now better comments and is parsed better. A change I did was to disallow hex addresses, because they are a bit error prone. I'm asking now to print the address in decimal. -- Renamed "intel" to "GenuineIntel" in the schema because that's what you see in /proc/cpuinfo. - Implemented reading the context switch trace data buffer. I had to do some refactors to do that cleanly. -- A major change that I did here was to simplify the perf_event circular buffer reading logic. It was too complex. Maybe the original Intel author had something different in mind. - Implemented all the necessary bits to read trace.json files with per-core data. - Implemented all the necessary bits to save to disk per-core trace session. - Added a test that ensures that parsing and saving to disk works. Differential Revision: https://reviews.llvm.org/D126015
108 lines
3.4 KiB
C++
108 lines
3.4 KiB
C++
//===-- IntelPTMultiCoreTrace.h ------------------------------- -*- 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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#ifndef liblldb_IntelPTMultiCoreTrace_H_
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#define liblldb_IntelPTMultiCoreTrace_H_
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#include "IntelPTProcessTrace.h"
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#include "IntelPTSingleBufferTrace.h"
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#include "lldb/Host/common/NativeProcessProtocol.h"
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#include "lldb/Utility/TraceIntelPTGDBRemotePackets.h"
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#include "lldb/lldb-types.h"
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#include "llvm/Support/Error.h"
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#include <memory>
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namespace lldb_private {
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namespace process_linux {
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class IntelPTMultiCoreTrace : public IntelPTProcessTrace {
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using ContextSwitchTrace = PerfEvent;
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public:
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/// Start tracing all CPU cores.
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///
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/// \param[in] request
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/// Intel PT configuration parameters.
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///
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/// \param[in] process
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/// The process being debugged.
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///
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/// \return
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/// An \a IntelPTMultiCoreTrace instance if tracing was successful, or
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/// an \a llvm::Error otherwise.
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static llvm::Expected<IntelPTProcessTraceUP>
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StartOnAllCores(const TraceIntelPTStartRequest &request,
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NativeProcessProtocol &process);
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/// Execute the provided callback on each core that is being traced.
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///
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/// \param[in] callback.core_id
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/// The core id that is being traced.
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///
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/// \param[in] callback.core_trace
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/// The single-buffer trace instance for the given core.
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void ForEachCore(std::function<void(lldb::core_id_t core_id,
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IntelPTSingleBufferTrace &core_trace)>
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callback);
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/// Execute the provided callback on each core that is being traced.
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///
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/// \param[in] callback.core_id
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/// The core id that is being traced.
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///
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/// \param[in] callback.intelpt_trace
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/// The single-buffer intel pt trace instance for the given core.
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///
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/// \param[in] callback.context_switch_trace
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/// The perf event collecting context switches for the given core.
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void ForEachCore(std::function<void(lldb::core_id_t core_id,
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IntelPTSingleBufferTrace &intelpt_trace,
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PerfEvent &context_switch_trace)>
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callback);
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void ProcessDidStop() override;
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void ProcessWillResume() override;
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TraceIntelPTGetStateResponse GetState() override;
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bool TracesThread(lldb::tid_t tid) const override;
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llvm::Error TraceStart(lldb::tid_t tid) override;
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llvm::Error TraceStop(lldb::tid_t tid) override;
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llvm::Expected<llvm::Optional<std::vector<uint8_t>>>
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TryGetBinaryData(const TraceGetBinaryDataRequest &request) override;
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private:
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/// This assumes that all underlying perf_events for each core are part of the
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/// same perf event group.
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IntelPTMultiCoreTrace(
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llvm::DenseMap<lldb::core_id_t,
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std::pair<IntelPTSingleBufferTrace, ContextSwitchTrace>>
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&&traces_per_core,
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NativeProcessProtocol &process)
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: m_traces_per_core(std::move(traces_per_core)), m_process(process) {}
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llvm::DenseMap<lldb::core_id_t,
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std::pair<IntelPTSingleBufferTrace, ContextSwitchTrace>>
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m_traces_per_core;
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/// The target process.
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NativeProcessProtocol &m_process;
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};
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} // namespace process_linux
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} // namespace lldb_private
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#endif // liblldb_IntelPTMultiCoreTrace_H_
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