103 lines
3.3 KiB
C++
103 lines
3.3 KiB
C++
/*
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* Copyright (C) 2017 Yusuke Suzuki <utatane.tea@gmail.com>.
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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
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
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* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
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* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
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* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (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 "config.h"
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#include <wtf/MemoryFootprint.h>
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#include <stdio.h>
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#include <wtf/MonotonicTime.h>
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#include <wtf/StdLibExtras.h>
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#include <wtf/text/StringView.h>
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namespace WTF {
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static const Seconds s_memoryFootprintUpdateInterval = 1_s;
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template<typename Functor>
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static void forEachLine(FILE* file, Functor functor)
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{
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char* buffer = nullptr;
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size_t size = 0;
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while (getline(&buffer, &size, file) != -1) {
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functor(buffer);
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}
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free(buffer);
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}
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static size_t computeMemoryFootprint()
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{
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FILE* file = fopen("/proc/self/smaps", "r");
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if (!file)
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return 0;
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unsigned long totalPrivateDirtyInKB = 0;
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bool isAnonymous = false;
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forEachLine(file, [&] (char* buffer) {
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{
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unsigned long start;
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unsigned long end;
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unsigned long offset;
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unsigned long inode;
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char dev[32];
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char perms[5];
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char path[7];
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int scannedCount = sscanf(buffer, "%lx-%lx %4s %lx %31s %lu %6s", &start, &end, perms, &offset, dev, &inode, path);
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if (scannedCount == 6) {
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isAnonymous = true;
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return;
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}
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if (scannedCount == 7) {
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StringView pathString(path);
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isAnonymous = pathString == "[heap]" || pathString.startsWith("[stack");
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return;
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}
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}
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if (!isAnonymous)
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return;
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unsigned long privateDirtyInKB;
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if (sscanf(buffer, "Private_Dirty: %lu", &privateDirtyInKB) == 1)
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totalPrivateDirtyInKB += privateDirtyInKB;
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});
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fclose(file);
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return totalPrivateDirtyInKB * KB;
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}
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size_t memoryFootprint()
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{
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static size_t footprint = 0;
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static MonotonicTime previousUpdateTime = { };
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Seconds elapsed = MonotonicTime::now() - previousUpdateTime;
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if (elapsed >= s_memoryFootprintUpdateInterval) {
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footprint = computeMemoryFootprint();
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previousUpdateTime = MonotonicTime::now();
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}
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return footprint;
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}
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} // namespace WTF
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