1f49714d3e
This diffs implements per-core tracing on lldb-server. It also includes tests that ensure that tracing can be initiated from the client and that the jLLDBGetState ppacket returns the list of trace buffers per core. This doesn't include any decoder changes. Finally, this makes some little changes here and there improving the existing code. A specific piece of code that can't reliably be tested is when tracing per core fails due to permissions. In this case we add a troubleshooting message and this is the manual test: ``` /proc/sys/kernel/perf_event_paranoid set to 1 (lldb) process trace start --per-core-tracing error: perf event syscall failed: Permission denied You might need that /proc/sys/kernel/perf_event_paranoid has a value of 0 or -1. `` Differential Revision: https://reviews.llvm.org/D124858
58 lines
1.7 KiB
C++
58 lines
1.7 KiB
C++
//===-- Procfs.h ---------------------------------------------- -*- C++ -*-===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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// source/Plugins/Process/Linux/Procfs.h defines the symbols we need from
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// sys/procfs.h on Android/Linux for all supported architectures.
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#include <sys/ptrace.h>
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#include "lldb/lldb-types.h"
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#include "llvm/Support/Error.h"
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#include <vector>
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#ifdef __ANDROID__
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#if defined(__arm64__) || defined(__aarch64__)
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typedef unsigned long elf_greg_t;
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typedef elf_greg_t
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elf_gregset_t[(sizeof(struct user_pt_regs) / sizeof(elf_greg_t))];
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typedef struct user_fpsimd_state elf_fpregset_t;
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#ifndef NT_FPREGSET
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#define NT_FPREGSET NT_PRFPREG
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#endif // NT_FPREGSET
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#elif defined(__mips__)
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#ifndef NT_FPREGSET
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#define NT_FPREGSET NT_PRFPREG
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#endif // NT_FPREGSET
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#endif
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#else // __ANDROID__
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#include <sys/procfs.h>
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#endif // __ANDROID__
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namespace lldb_private {
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namespace process_linux {
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/// \return
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/// The content of /proc/cpuinfo and cache it if errors didn't happen.
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llvm::Expected<llvm::ArrayRef<uint8_t>> GetProcfsCpuInfo();
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/// \return
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/// A list of available logical core ids given the contents of
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/// /proc/cpuinfo.
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llvm::Expected<std::vector<lldb::core_id_t>>
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GetAvailableLogicalCoreIDs(llvm::StringRef cpuinfo);
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/// \return
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/// A list with all the logical cores available in the system and cache it
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/// if errors didn't happen.
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llvm::Expected<llvm::ArrayRef<lldb::core_id_t>> GetAvailableLogicalCoreIDs();
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} // namespace process_linux
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} // namespace lldb_private
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