mirror of
https://github.com/SerenityOS/serenity
synced 2024-09-06 17:06:31 +00:00
b7ff3b5ad1
We were missing the innermost instruction pointer when sampling. This makes the instruction-level profile info a lot cooler! :^)
133 lines
4.4 KiB
C++
133 lines
4.4 KiB
C++
/*
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* Copyright (c) 2020, Andreas Kling <kling@serenityos.org>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice, this
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* list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <AK/JsonArraySerializer.h>
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#include <AK/JsonObject.h>
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#include <AK/JsonObjectSerializer.h>
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#include <Kernel/KBufferBuilder.h>
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#include <Kernel/PerformanceEventBuffer.h>
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namespace Kernel {
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PerformanceEventBuffer::PerformanceEventBuffer()
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: m_buffer(KBuffer::create_with_size(4 * MB))
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{
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}
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KResult PerformanceEventBuffer::append(int type, FlatPtr arg1, FlatPtr arg2)
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{
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if (count() >= capacity())
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return KResult(-ENOBUFS);
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PerformanceEvent event;
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event.type = type;
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switch (type) {
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case PERF_EVENT_MALLOC:
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event.data.malloc.size = arg1;
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event.data.malloc.ptr = arg2;
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#ifdef VERY_DEBUG
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dbg() << "PERF_EVENT_MALLOC: " << (void*)event.data.malloc.ptr << " (" << event.data.malloc.size << ")";
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#endif
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break;
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case PERF_EVENT_FREE:
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event.data.free.ptr = arg1;
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#ifdef VERY_DEBUG
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dbg() << "PERF_EVENT_FREE: " << (void*)event.data.free.ptr;
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#endif
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break;
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default:
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return KResult(-EINVAL);
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}
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FlatPtr ebp;
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asm volatile("movl %%ebp, %%eax"
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: "=a"(ebp));
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FlatPtr eip;
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copy_from_user(&eip, (FlatPtr*)&Thread::current->get_register_dump_from_stack().eip);
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Vector<FlatPtr> backtrace;
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{
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SmapDisabler disabler;
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backtrace = Thread::current->raw_backtrace(ebp, eip);
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}
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event.stack_size = min(sizeof(event.stack) / sizeof(FlatPtr), static_cast<size_t>(backtrace.size()));
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memcpy(event.stack, backtrace.data(), event.stack_size * sizeof(FlatPtr));
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#ifdef VERY_DEBUG
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for (size_t i = 0; i < event.stack_size; ++i)
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dbg() << " " << (void*)event.stack[i];
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#endif
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event.timestamp = g_uptime;
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at(m_count++) = event;
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return KSuccess;
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}
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PerformanceEvent& PerformanceEventBuffer::at(size_t index)
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{
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ASSERT(index < capacity());
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auto* events = reinterpret_cast<PerformanceEvent*>(m_buffer.data());
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return events[index];
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}
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KBuffer PerformanceEventBuffer::to_json(pid_t pid, const String& executable_path) const
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{
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KBufferBuilder builder;
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JsonObjectSerializer object(builder);
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object.add("pid", pid);
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object.add("executable", executable_path);
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auto array = object.add_array("events");
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for (size_t i = 0; i < m_count; ++i) {
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auto& event = at(i);
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auto event_object = array.add_object();
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switch (event.type) {
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case PERF_EVENT_MALLOC:
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event_object.add("type", "malloc");
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event_object.add("ptr", static_cast<u64>(event.data.malloc.ptr));
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event_object.add("size", static_cast<u64>(event.data.malloc.size));
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break;
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case PERF_EVENT_FREE:
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event_object.add("type", "free");
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event_object.add("ptr", static_cast<u64>(event.data.free.ptr));
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break;
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}
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event_object.add("timestamp", event.timestamp);
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auto stack_array = event_object.add_array("stack");
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for (size_t j = 0; j < event.stack_size; ++j) {
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stack_array.add(event.stack[j]);
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}
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stack_array.finish();
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event_object.finish();
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}
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array.finish();
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object.finish();
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return builder.build();
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}
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}
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