v29.4-roots.2 · Commit 2: [PATCH 02/21] runtime: preserve shared operator controls
src/util/mempressure.cpp
Before: /dev/null · After: src/util/mempressure.cpp
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src/util/mempressure.cpp
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// Copyright (c) 2023-present The Bitcoin Roots developers
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// Distributed under the MIT software license, see the accompanying
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// file COPYING or http://www.opensource.org/licenses/mit-license.php.
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#include <bitcoin-build-config.h> // IWYU pragma: keep
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#include <util/mempressure.h>
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#include <logging.h>
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#include <util/byte_units.h>
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#ifdef HAVE_LINUX_SYSINFO
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#include <sys/sysinfo.h>
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#endif
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#ifdef WIN32
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#include <windows.h>
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#endif
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#include <cstddef>
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#include <cstdint>
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size_t g_low_memory_threshold{0};
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bool SystemNeedsMemoryReleased()
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{
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if (g_low_memory_threshold <= 0) {
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// Intentionally bypass other metrics when disabled entirely
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return false;
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}
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#ifdef WIN32
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MEMORYSTATUSEX mem_status;
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mem_status.dwLength = sizeof(mem_status);
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if (GlobalMemoryStatusEx(&mem_status)) {
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if (mem_status.dwMemoryLoad >= 99 ||
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mem_status.ullAvailPhys < g_low_memory_threshold ||
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mem_status.ullAvailVirtual < g_low_memory_threshold) {
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LogPrintf("%s: YES: %s%% memory load; %s available physical memory; %s available virtual memory\n", __func__, int(mem_status.dwMemoryLoad), size_t(mem_status.ullAvailPhys), size_t(mem_status.ullAvailVirtual));
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return true;
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}
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}
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#endif
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#ifdef HAVE_LINUX_SYSINFO
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struct sysinfo sys_info;
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if (!sysinfo(&sys_info)) {
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// Explicitly 64-bit in case of 32-bit userspace on 64-bit kernel
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const uint64_t free_ram = uint64_t(sys_info.freeram) * sys_info.mem_unit;
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const uint64_t buffer_ram = uint64_t(sys_info.bufferram) * sys_info.mem_unit;
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if (free_ram + buffer_ram < g_low_memory_threshold) {
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LogPrintf("%s: YES: %s free RAM + %s buffer RAM\n", __func__, free_ram, buffer_ram);
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return true;
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}
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}
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#endif
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// NOTE: sysconf(_SC_AVPHYS_PAGES) doesn't account for caches on at least Linux, so not safe to use here
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return false;
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}
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