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60f5f48dd1
We need to allocate all pages for the profiler right away so that we don't trigger page faults in the timer interrupt handler to allocate them. Fixes #4734
110 lines
3.1 KiB
C++
110 lines
3.1 KiB
C++
/*
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* Copyright (c) 2018-2020, 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/Demangle.h>
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#include <AK/Singleton.h>
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#include <AK/StringBuilder.h>
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#include <Kernel/FileSystem/Custody.h>
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#include <Kernel/KBuffer.h>
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#include <Kernel/KSyms.h>
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#include <Kernel/Process.h>
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#include <Kernel/Profiling.h>
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namespace Kernel {
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namespace Profiling {
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static size_t s_slot_count;
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static AK::Singleton<KBuffer, []() -> KBuffer* {
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auto buffer = KBuffer::try_create_with_size(8 * MiB, Region::Access::Read | Region::Access::Write, "Profiling Buffer", AllocationStrategy::AllocateNow);
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s_slot_count = buffer->size() / sizeof(Sample);
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return buffer.leak_ptr();
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}>
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s_profiling_buffer;
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static size_t s_next_slot_index;
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static ProcessID s_pid { -1 };
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String& executable_path()
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{
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static String* path;
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if (!path)
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path = new String;
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return *path;
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}
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ProcessID pid()
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{
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return s_pid;
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}
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void start(Process& process)
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{
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if (process.executable())
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executable_path() = process.executable()->absolute_path().impl();
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else
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executable_path() = {};
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s_pid = process.pid();
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s_profiling_buffer.ensure_instance();
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s_next_slot_index = 0;
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}
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static Sample& sample_slot(size_t index)
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{
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return ((Sample*)s_profiling_buffer->data())[index];
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}
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Sample& next_sample_slot()
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{
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auto& slot = sample_slot(s_next_slot_index++);
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if (s_next_slot_index >= s_slot_count)
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s_next_slot_index = 0;
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return slot;
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}
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void stop()
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{
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// FIXME: This probably shouldn't be empty.
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}
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void did_exec(const String& new_executable_path)
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{
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executable_path() = new_executable_path;
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s_next_slot_index = 0;
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}
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void for_each_sample(Function<void(Sample&)> callback)
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{
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for (size_t i = 0; i < s_next_slot_index; ++i) {
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auto& sample = sample_slot(i);
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callback(sample);
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}
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}
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}
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}
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