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https://github.com/RGBCube/serenity
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4ed682aebc
While profiling all processes the profile buffer lives forever. Once you have copied the profile to disk, there's no need to keep it in memory. This syscall surfaces the ability to clear that buffer.
123 lines
3.7 KiB
C++
123 lines
3.7 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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PerformanceEventBuffer* g_global_perf_events;
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bool g_profiling_all_threads;
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KResultOr<int> Process::sys$profiling_enable(pid_t pid)
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{
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REQUIRE_NO_PROMISES;
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if (pid == -1) {
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if (!is_superuser())
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return EPERM;
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ScopedCritical critical;
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if (g_global_perf_events)
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g_global_perf_events->clear();
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else
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g_global_perf_events = PerformanceEventBuffer::try_create_with_size(32 * MiB).leak_ptr();
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g_profiling_all_threads = true;
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return 0;
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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 (process->is_dead())
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return ESRCH;
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if (!is_superuser() && process->uid() != euid())
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return EPERM;
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if (!process->create_perf_events_buffer_if_needed())
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return ENOMEM;
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process->set_profiling(true);
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return 0;
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}
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KResultOr<int> Process::sys$profiling_disable(pid_t pid)
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{
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REQUIRE_NO_PROMISES;
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if (pid == -1) {
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if (!is_superuser())
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return EPERM;
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ScopedCritical critical;
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g_profiling_all_threads = false;
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return 0;
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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() != euid())
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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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KResultOr<int> Process::sys$profiling_free_buffer(pid_t pid)
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{
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REQUIRE_NO_PROMISES;
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if (pid == -1) {
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if (!is_superuser())
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return EPERM;
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OwnPtr<PerformanceEventBuffer> perf_events;
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{
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ScopedCritical critical;
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perf_events = g_global_perf_events;
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g_global_perf_events = nullptr;
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}
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return 0;
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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() != euid())
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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->delete_perf_events_buffer();
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return 0;
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}
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}
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