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
97 lines
3.4 KiB
C++
97 lines
3.4 KiB
C++
//===-- TraceIntelPTGDBRemotePackets.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 "lldb/Utility/TraceIntelPTGDBRemotePackets.h"
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using namespace llvm;
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using namespace llvm::json;
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namespace lldb_private {
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const char *IntelPTDataKinds::kProcFsCpuInfo = "procfsCpuInfo";
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const char *IntelPTDataKinds::kTraceBuffer = "traceBuffer";
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const char *IntelPTDataKinds::kPerfContextSwitchTrace =
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"perfContextSwitchTrace";
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bool TraceIntelPTStartRequest::IsPerCoreTracing() const {
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return per_core_tracing.getValueOr(false);
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}
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bool fromJSON(const json::Value &value, TraceIntelPTStartRequest &packet,
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Path path) {
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ObjectMapper o(value, path);
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if (!o || !fromJSON(value, (TraceStartRequest &)packet, path) ||
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!o.map("enableTsc", packet.enable_tsc) ||
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!o.map("psbPeriod", packet.psb_period) ||
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!o.map("traceBufferSize", packet.trace_buffer_size))
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return false;
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if (packet.IsProcessTracing()) {
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if (!o.map("processBufferSizeLimit", packet.process_buffer_size_limit) ||
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!o.map("perCoreTracing", packet.per_core_tracing))
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return false;
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}
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return true;
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}
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json::Value toJSON(const TraceIntelPTStartRequest &packet) {
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json::Value base = toJSON((const TraceStartRequest &)packet);
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json::Object &obj = *base.getAsObject();
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obj.try_emplace("traceBufferSize", packet.trace_buffer_size);
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obj.try_emplace("processBufferSizeLimit", packet.process_buffer_size_limit);
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obj.try_emplace("psbPeriod", packet.psb_period);
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obj.try_emplace("enableTsc", packet.enable_tsc);
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obj.try_emplace("perCoreTracing", packet.per_core_tracing);
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return base;
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}
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std::chrono::nanoseconds LinuxPerfZeroTscConversion::ToNanos(uint64_t tsc) {
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uint64_t quot = tsc >> time_shift;
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uint64_t rem_flag = (((uint64_t)1 << time_shift) - 1);
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uint64_t rem = tsc & rem_flag;
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return std::chrono::nanoseconds{time_zero + quot * time_mult +
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((rem * time_mult) >> time_shift)};
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}
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json::Value toJSON(const LinuxPerfZeroTscConversion &packet) {
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return json::Value(json::Object{
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{"timeMult", packet.time_mult},
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{"timeShift", packet.time_shift},
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{"timeZero", packet.time_zero},
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});
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}
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bool fromJSON(const json::Value &value, LinuxPerfZeroTscConversion &packet,
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json::Path path) {
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ObjectMapper o(value, path);
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uint64_t time_mult, time_shift, time_zero;
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if (!o || !o.map("timeMult", time_mult) || !o.map("timeShift", time_shift) ||
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!o.map("timeZero", time_zero))
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return false;
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packet.time_mult = time_mult;
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packet.time_zero = time_zero;
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packet.time_shift = time_shift;
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return true;
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}
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bool fromJSON(const json::Value &value, TraceIntelPTGetStateResponse &packet,
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json::Path path) {
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ObjectMapper o(value, path);
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return o && fromJSON(value, (TraceGetStateResponse &)packet, path) &&
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o.map("tscPerfZeroConversion", packet.tsc_perf_zero_conversion);
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}
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json::Value toJSON(const TraceIntelPTGetStateResponse &packet) {
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json::Value base = toJSON((const TraceGetStateResponse &)packet);
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base.getAsObject()->insert(
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{"tscPerfZeroConversion", packet.tsc_perf_zero_conversion});
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return base;
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}
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} // namespace lldb_private
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