2020-02-02 19:26:27 +00:00
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/*
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2021-01-11 08:52:18 +00:00
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* Copyright (c) 2020-2021, Andreas Kling <kling@serenityos.org>
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2020-02-02 19:26:27 +00:00
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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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2020-02-22 09:05:03 +00:00
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#include <AK/JsonObject.h>
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2020-03-22 00:12:45 +00:00
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#include <AK/JsonObjectSerializer.h>
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2021-02-25 16:25:34 +00:00
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#include <Kernel/Arch/x86/SmapDisabler.h>
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2020-02-02 19:26:27 +00:00
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#include <Kernel/KBufferBuilder.h>
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#include <Kernel/PerformanceEventBuffer.h>
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2021-01-11 08:52:18 +00:00
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#include <Kernel/Process.h>
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2020-02-02 19:26:27 +00:00
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2020-02-16 00:27:42 +00:00
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namespace Kernel {
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2021-03-02 15:55:54 +00:00
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PerformanceEventBuffer::PerformanceEventBuffer(NonnullOwnPtr<KBuffer> buffer)
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: m_buffer(move(buffer))
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2020-02-02 19:26:27 +00:00
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{
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}
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2020-03-08 09:36:51 +00:00
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KResult PerformanceEventBuffer::append(int type, FlatPtr arg1, FlatPtr arg2)
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2021-01-17 09:53:18 +00:00
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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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auto current_thread = Thread::current();
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auto eip = current_thread->get_register_dump_from_stack().eip;
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return append_with_eip_and_ebp(eip, ebp, type, arg1, arg2);
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}
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2021-02-03 10:51:13 +00:00
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static Vector<FlatPtr, PerformanceEvent::max_stack_frame_count> raw_backtrace(FlatPtr ebp, FlatPtr eip)
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{
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Vector<FlatPtr, PerformanceEvent::max_stack_frame_count> backtrace;
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backtrace.append(eip);
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FlatPtr stack_ptr_copy;
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FlatPtr stack_ptr = (FlatPtr)ebp;
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// FIXME: Figure out how to remove this SmapDisabler without breaking profile stacks.
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SmapDisabler disabler;
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while (stack_ptr) {
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void* fault_at;
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if (!safe_memcpy(&stack_ptr_copy, (void*)stack_ptr, sizeof(FlatPtr), fault_at))
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break;
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FlatPtr retaddr;
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if (!safe_memcpy(&retaddr, (void*)(stack_ptr + sizeof(FlatPtr)), sizeof(FlatPtr), fault_at))
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break;
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backtrace.append(retaddr);
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if (backtrace.size() == PerformanceEvent::max_stack_frame_count)
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break;
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stack_ptr = stack_ptr_copy;
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}
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return backtrace;
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}
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2021-01-17 09:53:18 +00:00
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KResult PerformanceEventBuffer::append_with_eip_and_ebp(u32 eip, u32 ebp, int type, FlatPtr arg1, FlatPtr arg2)
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2020-02-02 19:26:27 +00:00
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{
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if (count() >= capacity())
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2021-01-20 22:11:17 +00:00
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return ENOBUFS;
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2020-02-02 19:26:27 +00:00
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PerformanceEvent event;
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event.type = type;
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switch (type) {
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2021-01-11 08:52:18 +00:00
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case PERF_EVENT_SAMPLE:
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break;
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2020-02-02 19:26:27 +00:00
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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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break;
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case PERF_EVENT_FREE:
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event.data.free.ptr = arg1;
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break;
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default:
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2021-01-20 22:11:17 +00:00
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return EINVAL;
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2020-02-02 19:26:27 +00:00
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}
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2021-02-03 10:51:13 +00:00
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auto backtrace = raw_backtrace(ebp, eip);
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2020-03-08 09:36:51 +00:00
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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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2020-02-02 19:26:27 +00:00
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2021-03-02 16:19:35 +00:00
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event.tid = Thread::current()->tid().value();
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2020-11-15 18:58:19 +00:00
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event.timestamp = TimeManagement::the().uptime_ms();
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2020-02-02 19:26:27 +00:00
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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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2021-02-23 19:42:32 +00:00
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VERIFY(index < capacity());
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2020-12-18 19:43:39 +00:00
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auto* events = reinterpret_cast<PerformanceEvent*>(m_buffer->data());
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2020-02-02 19:26:27 +00:00
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return events[index];
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}
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2020-12-18 13:10:10 +00:00
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OwnPtr<KBuffer> PerformanceEventBuffer::to_json(ProcessID pid, const String& executable_path) const
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2020-02-02 19:26:27 +00:00
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{
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KBufferBuilder builder;
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2021-01-11 08:52:18 +00:00
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if (!to_json(builder, pid, executable_path))
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2021-01-10 23:29:28 +00:00
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return {};
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2021-01-11 08:52:18 +00:00
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return builder.build();
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}
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2021-03-02 16:19:35 +00:00
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template<typename Serializer>
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bool PerformanceEventBuffer::to_json_impl(Serializer& object) const
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2021-01-11 08:52:18 +00:00
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{
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2020-02-02 19:26:27 +00:00
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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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2020-03-01 20:08:04 +00:00
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auto event_object = array.add_object();
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2020-02-02 19:26:27 +00:00
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switch (event.type) {
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2021-01-11 08:52:18 +00:00
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case PERF_EVENT_SAMPLE:
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event_object.add("type", "sample");
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break;
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2020-02-02 19:26:27 +00:00
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case PERF_EVENT_MALLOC:
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2020-03-01 20:08:04 +00:00
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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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2020-02-02 19:26:27 +00:00
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break;
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case PERF_EVENT_FREE:
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2020-03-01 20:08:04 +00:00
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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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2020-02-02 19:26:27 +00:00
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break;
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}
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2021-01-11 08:52:18 +00:00
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event_object.add("tid", event.tid);
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2020-03-01 20:08:04 +00:00
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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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2020-02-02 19:26:27 +00:00
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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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2020-03-01 20:08:04 +00:00
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event_object.finish();
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2020-02-02 19:26:27 +00:00
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}
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array.finish();
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object.finish();
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2021-01-11 08:52:18 +00:00
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return true;
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2020-02-02 19:26:27 +00:00
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}
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2020-02-16 00:27:42 +00:00
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2021-03-02 16:19:35 +00:00
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bool PerformanceEventBuffer::to_json(KBufferBuilder& builder)
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{
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JsonObjectSerializer object(builder);
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return to_json_impl(object);
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}
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bool PerformanceEventBuffer::to_json(KBufferBuilder& builder, ProcessID pid, const String& executable_path) const
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{
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auto process = Process::from_pid(pid);
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VERIFY(process);
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ScopedSpinLock locker(process->space().get_lock());
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JsonObjectSerializer object(builder);
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object.add("pid", pid.value());
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object.add("executable", executable_path);
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{
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auto region_array = object.add_array("regions");
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for (const auto& region : process->space().regions()) {
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auto region_object = region_array.add_object();
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region_object.add("base", region.vaddr().get());
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region_object.add("size", region.size());
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region_object.add("name", region.name());
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}
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region_array.finish();
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}
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return to_json_impl(object);
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}
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2021-03-02 15:55:54 +00:00
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OwnPtr<PerformanceEventBuffer> PerformanceEventBuffer::try_create_with_size(size_t buffer_size)
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{
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auto buffer = KBuffer::try_create_with_size(buffer_size, Region::Access::Read | Region::Access::Write, "Performance events", AllocationStrategy::AllocateNow);
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if (!buffer)
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return {};
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return adopt_own(*new PerformanceEventBuffer(buffer.release_nonnull()));
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}
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2020-02-16 00:27:42 +00:00
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}
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