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//===-- Procfs.cpp --------------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#include "Procfs.h"
#include "lldb/Host/linux/Support.h"
#include "llvm/Support/MemoryBuffer.h"
#include "llvm/Support/Threading.h"
#include <optional>
using namespace lldb;
using namespace lldb_private;
using namespace process_linux;
using namespace llvm;
Expected<ArrayRef<uint8_t>> lldb_private::process_linux::GetProcfsCpuInfo() {
static ErrorOr<std::unique_ptr<MemoryBuffer>> cpu_info_or_err =
getProcFile("cpuinfo");
if (!*cpu_info_or_err)
cpu_info_or_err.getError();
MemoryBuffer &buffer = **cpu_info_or_err;
return arrayRefFromStringRef(buffer.getBuffer());
}
Expected<std::vector<cpu_id_t>>
lldb_private::process_linux::GetAvailableLogicalCoreIDs(StringRef cpuinfo) {
SmallVector<StringRef, 8> lines;
cpuinfo.split(lines, "\n", /*MaxSplit=*/-1, /*KeepEmpty=*/false);
std::vector<cpu_id_t> logical_cores;
for (StringRef line : lines) {
std::pair<StringRef, StringRef> key_value = line.split(':');
auto key = key_value.first.trim();
auto val = key_value.second.trim();
if (key == "processor") {
cpu_id_t processor;
if (val.getAsInteger(10, processor))
return createStringError(
inconvertibleErrorCode(),
"Failed parsing the /proc/cpuinfo line entry: %s", line.data());
logical_cores.push_back(processor);
}
}
return logical_cores;
}
llvm::Expected<llvm::ArrayRef<cpu_id_t>>
lldb_private::process_linux::GetAvailableLogicalCoreIDs() {
static std::optional<std::vector<cpu_id_t>> logical_cores_ids;
if (!logical_cores_ids) {
// We find the actual list of core ids by parsing /proc/cpuinfo
Expected<ArrayRef<uint8_t>> cpuinfo = GetProcfsCpuInfo();
if (!cpuinfo)
return cpuinfo.takeError();
Expected<std::vector<cpu_id_t>> cpu_ids = GetAvailableLogicalCoreIDs(
StringRef(reinterpret_cast<const char *>(cpuinfo->data())));
if (!cpu_ids)
return cpu_ids.takeError();
logical_cores_ids.emplace(std::move(*cpu_ids));
}
return *logical_cores_ids;
}
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