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
92 lines
2.9 KiB
C++
92 lines
2.9 KiB
C++
//===-- IntelPTThreadTraceCollection.cpp ----------------------------------===//
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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 "IntelPTThreadTraceCollection.h"
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using namespace lldb;
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using namespace lldb_private;
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using namespace process_linux;
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using namespace llvm;
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bool IntelPTThreadTraceCollection::TracesThread(lldb::tid_t tid) const {
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return m_thread_traces.count(tid);
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}
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Error IntelPTThreadTraceCollection::TraceStop(lldb::tid_t tid) {
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auto it = m_thread_traces.find(tid);
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if (it == m_thread_traces.end())
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return createStringError(inconvertibleErrorCode(),
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"Thread %" PRIu64 " not currently traced", tid);
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m_total_buffer_size -= it->second.GetTraceBufferSize();
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m_thread_traces.erase(tid);
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return Error::success();
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}
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Error IntelPTThreadTraceCollection::TraceStart(
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lldb::tid_t tid, const TraceIntelPTStartRequest &request) {
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if (TracesThread(tid))
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return createStringError(inconvertibleErrorCode(),
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"Thread %" PRIu64 " already traced", tid);
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Expected<IntelPTSingleBufferTrace> trace =
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IntelPTSingleBufferTrace::Start(request, tid);
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if (!trace)
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return trace.takeError();
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m_total_buffer_size += trace->GetTraceBufferSize();
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m_thread_traces.try_emplace(tid, std::move(*trace));
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return Error::success();
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}
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size_t IntelPTThreadTraceCollection::GetTotalBufferSize() const {
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return m_total_buffer_size;
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}
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void IntelPTThreadTraceCollection::ForEachThread(
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std::function<void(lldb::tid_t tid, IntelPTSingleBufferTrace &thread_trace)>
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callback) {
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for (auto &it : m_thread_traces)
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callback(it.first, it.second);
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}
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Expected<IntelPTSingleBufferTrace &>
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IntelPTThreadTraceCollection::GetTracedThread(lldb::tid_t tid) {
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auto it = m_thread_traces.find(tid);
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if (it == m_thread_traces.end())
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return createStringError(inconvertibleErrorCode(),
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"Thread %" PRIu64 " not currently traced", tid);
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return it->second;
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}
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void IntelPTThreadTraceCollection::Clear() {
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m_thread_traces.clear();
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m_total_buffer_size = 0;
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}
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size_t IntelPTThreadTraceCollection::GetTracedThreadsCount() const {
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return m_thread_traces.size();
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}
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llvm::Expected<llvm::Optional<std::vector<uint8_t>>>
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IntelPTThreadTraceCollection::TryGetBinaryData(
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const TraceGetBinaryDataRequest &request) {
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if (!request.tid)
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return None;
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if (request.kind != IntelPTDataKinds::kTraceBuffer)
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return None;
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if (!TracesThread(*request.tid))
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return None;
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if (Expected<IntelPTSingleBufferTrace &> trace =
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GetTracedThread(*request.tid))
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return trace->GetTraceBuffer(request.offset, request.size);
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else
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return trace.takeError();
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}
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