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5dafb72370
This patch merges the profiling functionality in the kernel with the performance events mechanism. A profiler sample is now just another perf event, rather than a dedicated thing. Since perf events were already per-process, this now makes profiling per-process as well. Processes with perf events would already write out a perfcore.PID file to the current directory on death, but since we may want to profile a process and then let it continue running, recorded perf events can now be accessed at any time via /proc/PID/perf_events. This patch also adds information about process memory regions to the perfcore JSON format. This removes the need to supply a core dump to the Profiler app for symbolication, and so the "profiler coredump" mechanism is removed entirely. There's still a hard limit of 4MB worth of perf events per process, so this is by no means a perfect final design, but it's a nice step forward for both simplicity and stability. Fixes #4848 Fixes #4849
65 lines
2.3 KiB
C++
65 lines
2.3 KiB
C++
/*
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* Copyright (c) 2018-2021, 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 <Kernel/CoreDump.h>
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#include <Kernel/FileSystem/FileDescription.h>
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#include <Kernel/FileSystem/VirtualFileSystem.h>
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#include <Kernel/PerformanceEventBuffer.h>
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#include <Kernel/Process.h>
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namespace Kernel {
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int Process::sys$profiling_enable(pid_t pid)
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{
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REQUIRE_NO_PROMISES;
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ScopedSpinLock lock(g_processes_lock);
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auto process = Process::from_pid(pid);
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if (!process)
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return -ESRCH;
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if (process->is_dead())
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return -ESRCH;
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if (!is_superuser() && process->uid() != m_uid)
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return -EPERM;
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process->ensure_perf_events();
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process->set_profiling(true);
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return 0;
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}
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int Process::sys$profiling_disable(pid_t pid)
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{
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ScopedSpinLock lock(g_processes_lock);
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auto process = Process::from_pid(pid);
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if (!process)
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return -ESRCH;
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if (!is_superuser() && process->uid() != m_uid)
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return -EPERM;
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if (!process->is_profiling())
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return -EINVAL;
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process->set_profiling(false);
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return 0;
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}
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}
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