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/*
* Copyright (C) 2018 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include <errno.h>
#include <fcntl.h>
#include <inttypes.h>
#include <linux/kernel-page-flags.h>
#include <stdio.h>
#include <unistd.h>
#include <fstream>
#include <iostream>
#include <memory>
#include <string>
#include <utility>
#include <android-base/file.h>
#include <android-base/logging.h>
#include <android-base/stringprintf.h>
#include <android-base/unique_fd.h>
#include <procinfo/process_map.h>
#include "meminfo_private.h"
namespace android {
namespace meminfo {
static void add_mem_usage(MemUsage* to, const MemUsage& from) {
to->vss += from.vss;
to->rss += from.rss;
to->pss += from.pss;
to->uss += from.uss;
to->swap += from.swap;
to->private_clean += from.private_clean;
to->private_dirty += from.private_dirty;
to->shared_clean += from.shared_clean;
to->shared_dirty += from.shared_dirty;
}
ProcMemInfo::ProcMemInfo(pid_t pid, bool get_wss) : pid_(pid), get_wss_(get_wss) {
if (!ReadMaps(get_wss_)) {
LOG(ERROR) << "Failed to read maps for Process " << pid_;
}
}
const std::vector<Vma>& ProcMemInfo::Maps() {
return maps_;
}
const MemUsage& ProcMemInfo::Usage() {
if (get_wss_) {
LOG(WARNING) << "Trying to read memory usage from working set object";
}
return usage_;
}
const MemUsage& ProcMemInfo::Wss() {
if (!get_wss_) {
LOG(WARNING) << "Trying to read working set when there is none";
}
return wss_;
}
const std::vector<uint16_t>& ProcMemInfo::SwapOffsets() const {
return swap_offsets_;
}
bool ProcMemInfo::WssReset() {
if (!get_wss_) {
LOG(ERROR) << "Trying to reset working set from a memory usage counting object";
return false;
}
std::string clear_refs_path = ::android::base::StringPrintf("/proc/%d/clear_refs", pid_);
if (!::android::base::WriteStringToFile("1\n", clear_refs_path)) {
PLOG(ERROR) << "Failed to write to " << clear_refs_path;
return false;
}
wss_.clear();
return true;
}
bool ProcMemInfo::ReadMaps(bool get_wss) {
// parse and read /proc/<pid>/maps
std::string maps_file = ::android::base::StringPrintf("/proc/%d/maps", pid_);
if (!::android::procinfo::ReadMapFile(
maps_file, [&](uint64_t start, uint64_t end, uint16_t flags, uint64_t pgoff,
const char* name) {
maps_.emplace_back(Vma(start, end, pgoff, flags, name));
})) {
LOG(ERROR) << "Failed to parse " << maps_file;
maps_.clear();
return false;
}
std::string pagemap_file = ::android::base::StringPrintf("/proc/%d/pagemap", pid_);
::android::base::unique_fd pagemap_fd(
TEMP_FAILURE_RETRY(open(pagemap_file.c_str(), O_RDONLY | O_CLOEXEC)));
if (pagemap_fd < 0) {
PLOG(ERROR) << "Failed to open " << pagemap_file;
return false;
}
for (auto& vma : maps_) {
if (!ReadVmaStats(pagemap_fd.get(), vma, get_wss)) {
LOG(ERROR) << "Failed to read page map for vma " << vma.name << "[" << vma.start << "-"
<< vma.end << "]";
maps_.clear();
return false;
}
if (get_wss) {
add_mem_usage(&wss_, vma.wss);
} else {
add_mem_usage(&usage_, vma.usage);
}
}
return true;
}
bool ProcMemInfo::ReadVmaStats(int pagemap_fd, Vma& vma, bool get_wss) {
PageAcct& pinfo = PageAcct::Instance();
uint64_t pagesz = getpagesize();
uint64_t num_pages = (vma.end - vma.start) / pagesz;
std::unique_ptr<uint64_t[]> pg_frames(new uint64_t[num_pages]);
uint64_t first = vma.start / pagesz;
if (pread64(pagemap_fd, pg_frames.get(), num_pages * sizeof(uint64_t),
first * sizeof(uint64_t)) < 0) {
PLOG(ERROR) << "Failed to read page frames from page map for pid: " << pid_;
return false;
}
std::unique_ptr<uint64_t[]> pg_flags(new uint64_t[num_pages]);
std::unique_ptr<uint64_t[]> pg_counts(new uint64_t[num_pages]);
for (uint64_t i = 0; i < num_pages; ++i) {
if (!get_wss) {
vma.usage.vss += pagesz;
}
uint64_t p = pg_frames[i];
if (!PAGE_PRESENT(p) && !PAGE_SWAPPED(p)) continue;
if (PAGE_SWAPPED(p)) {
vma.usage.swap += pagesz;
swap_offsets_.emplace_back(PAGE_SWAP_OFFSET(p));
continue;
}
uint64_t page_frame = PAGE_PFN(p);
if (!pinfo.PageFlags(page_frame, &pg_flags[i])) {
LOG(ERROR) << "Failed to get page flags for " << page_frame << " in process " << pid_;
return false;
}
if (!pinfo.PageMapCount(page_frame, &pg_counts[i])) {
LOG(ERROR) << "Failed to get page count for " << page_frame << " in process " << pid_;
return false;
}
// Page was unmapped between the presence check at the beginning of the loop and here.
if (pg_counts[i] == 0) {
pg_frames[i] = 0;
pg_flags[i] = 0;
continue;
}
bool is_dirty = !!(pg_flags[i] & (1 << KPF_DIRTY));
bool is_private = (pg_counts[i] == 1);
// Working set
if (get_wss) {
bool is_referenced = !!(pg_flags[i] & (1 << KPF_REFERENCED));
if (!is_referenced) {
continue;
}
// This effectively makes vss = rss for the working set is requested.
// The libpagemap implementation returns vss > rss for
// working set, which doesn't make sense.
vma.wss.vss += pagesz;
vma.wss.rss += pagesz;
vma.wss.uss += is_private ? pagesz : 0;
vma.wss.pss += pagesz / pg_counts[i];
if (is_private) {
vma.wss.private_dirty += is_dirty ? pagesz : 0;
vma.wss.private_clean += is_dirty ? 0 : pagesz;
} else {
vma.wss.shared_dirty += is_dirty ? pagesz : 0;
vma.wss.shared_clean += is_dirty ? 0 : pagesz;
}
} else {
vma.usage.rss += pagesz;
vma.usage.uss += is_private ? pagesz : 0;
vma.usage.pss += pagesz / pg_counts[i];
if (is_private) {
vma.usage.private_dirty += is_dirty ? pagesz : 0;
vma.usage.private_clean += is_dirty ? 0 : pagesz;
} else {
vma.usage.shared_dirty += is_dirty ? pagesz : 0;
vma.usage.shared_clean += is_dirty ? 0 : pagesz;
}
}
}
return true;
}
} // namespace meminfo
} // namespace android
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