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1e90a3a542
Making userspace provide a global string ID was silly, and made the API extremely difficult to use correctly in a global profiling context. Instead, simply make the kernel do the string ID allocation for us. This also allows us to convert the string storage to a Vector in the kernel (and an array in the JSON profile data.)
38 lines
1.1 KiB
C++
38 lines
1.1 KiB
C++
/*
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* Copyright (c) 2018-2021, Andreas Kling <kling@serenityos.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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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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KResultOr<FlatPtr> Process::sys$perf_event(int type, FlatPtr arg1, FlatPtr arg2)
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{
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VERIFY_PROCESS_BIG_LOCK_ACQUIRED(this)
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auto events_buffer = current_perf_events_buffer();
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if (!events_buffer) {
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if (!create_perf_events_buffer_if_needed())
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return ENOMEM;
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events_buffer = perf_events();
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}
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return events_buffer->append(type, arg1, arg2, nullptr);
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}
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KResultOr<FlatPtr> Process::sys$perf_register_string(Userspace<char const*> user_string, size_t user_string_length)
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{
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VERIFY_PROCESS_BIG_LOCK_ACQUIRED(this)
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auto* events_buffer = current_perf_events_buffer();
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if (!events_buffer)
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return KSuccess;
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auto string_or_error = try_copy_kstring_from_user(user_string, user_string_length);
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if (string_or_error.is_error())
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return string_or_error.error();
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return events_buffer->register_string(string_or_error.release_value());
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}
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}
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