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Kernel+Profiler: Capture metadata about all profiled processes

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The perfcore file format was previously limited to a single process
since the pid/executable/regions data was top-level in the JSON.

This patch moves the process-specific data into a top-level array
named "processes" and we now add entries for each process that has
been sampled during the profile run.

This makes it possible to see samples from multiple threads when
viewing a perfcore file with Profiler. This is extremely cool! :^)
This commit is contained in:
Andreas Kling 2021-03-02 19:01:02 +01:00
parent ea500dd3e3
commit 5e7abea31e
11 changed files with 223 additions and 102 deletions
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75
Kernel/PerformanceEventBuffer.cpp
View file

@ -28,6 +28,7 @@
#include <AK/JsonObject.h>
#include <AK/JsonObjectSerializer.h>
#include <Kernel/Arch/x86/SmapDisabler.h>
#include <Kernel/FileSystem/Custody.h>
#include <Kernel/KBufferBuilder.h>
#include <Kernel/PerformanceEventBuffer.h>
#include <Kernel/Process.h>
@ -111,14 +112,6 @@ PerformanceEvent& PerformanceEventBuffer::at(size_t index)
return events[index];
}
OwnPtr<KBuffer> PerformanceEventBuffer::to_json(ProcessID pid, const String& executable_path) const
{
KBufferBuilder builder;
if (!to_json(builder, pid, executable_path))
return {};
return builder.build();
}
template<typename Serializer>
bool PerformanceEventBuffer::to_json_impl(Serializer& object) const
{
@ -154,33 +147,28 @@ bool PerformanceEventBuffer::to_json_impl(Serializer& object) const
return true;
}
bool PerformanceEventBuffer::to_json(KBufferBuilder& builder)
bool PerformanceEventBuffer::to_json(KBufferBuilder& builder) const
{
JsonObjectSerializer object(builder);
return to_json_impl(object);
}
bool PerformanceEventBuffer::to_json(KBufferBuilder& builder, ProcessID pid, const String& executable_path) const
{
auto process = Process::from_pid(pid);
VERIFY(process);
ScopedSpinLock locker(process->space().get_lock());
auto processes_array = object.add_array("processes");
for (auto& it : m_processes) {
auto& process = *it.value;
auto process_object = processes_array.add_object();
process_object.add("pid", process.pid.value());
process_object.add("executable", process.executable);
JsonObjectSerializer object(builder);
object.add("pid", pid.value());
object.add("executable", executable_path);
{
auto region_array = object.add_array("regions");
for (const auto& region : process->space().regions()) {
auto region_object = region_array.add_object();
region_object.add("base", region.vaddr().get());
region_object.add("size", region.size());
region_object.add("name", region.name());
auto regions_array = process_object.add_array("regions");
for (auto& region : process.regions) {
auto region_object = regions_array.add_object();
region_object.add("name", region.name);
region_object.add("base", region.range.base().get());
region_object.add("size", region.range.size());
}
region_array.finish();
}
processes_array.finish();
return to_json_impl(object);
}
@ -192,4 +180,35 @@ OwnPtr<PerformanceEventBuffer> PerformanceEventBuffer::try_create_with_size(size
return adopt_own(*new PerformanceEventBuffer(buffer.release_nonnull()));
}
void PerformanceEventBuffer::add_process(const Process& process)
{
// FIXME: What about threads that have died?
ScopedSpinLock locker(process.space().get_lock());
String executable;
if (process.executable())
executable = process.executable()->absolute_path();
auto sampled_process = adopt_own(*new SampledProcess {
.pid = process.pid().value(),
.executable = executable,
.threads = {},
.regions = {},
});
process.for_each_thread([&](auto& thread) {
sampled_process->threads.set(thread.tid());
return IterationDecision::Continue;
});
for (auto& region : process.space().regions()) {
sampled_process->regions.append(SampledProcess::Region {
.name = region.name(),
.range = region.range(),
});
}
m_processes.set(process.pid(), move(sampled_process));
}
}