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// Copyright 2017 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "process_memory_stats.h"
#include <inttypes.h>
#include <stdio.h>
#include <stdlib.h>
#include <memory>
#include "file_utils.h"
#include "libmemtrack_wrapper.h"
#include "logging.h"
namespace {
const int kKbPerPage = 4;
const char kRss[] = "Rss";
const char kPss[] = "Pss";
const char kSwap[] = "Swap";
const char kSharedClean[] = "Shared_Clean";
const char kSharedDirty[] = "Shared_Dirty";
const char kPrivateClean[] = "Private_Clean";
const char kPrivateDirty[] = "Private_Dirty";
bool ReadSmapsMetric(
const char* line, const char* metric, int metric_size, uint64_t* res) {
if (strncmp(line, metric, metric_size - 1))
return false;
if (line[metric_size - 1] != ':')
return false;
*res = strtoull(line + metric_size, nullptr, 10);
return true;
}
} // namespace
bool ProcessMemoryStats::ReadLightStats(int pid) {
char buf[64];
if (file_utils::ReadProcFile(pid, "statm", buf, sizeof(buf)) <= 0)
return false;
uint32_t vm_size_pages;
uint32_t rss_pages;
int res = sscanf(buf, "%u %u", &vm_size_pages, &rss_pages);
CHECK(res == 2);
rss_kb_ = rss_pages * kKbPerPage;
virt_kb_ = vm_size_pages * kKbPerPage;
return true;
}
bool ProcessMemoryStats::ReadFullStats(int pid) {
const size_t kBufSize = 8u * 1024 * 1024;
std::unique_ptr<char[]> buf(new char[kBufSize]);
ssize_t rsize = file_utils::ReadProcFile(pid, "smaps", &buf[0], kBufSize);
if (rsize <= 0)
return false;
MmapInfo* last_mmap_entry = nullptr;
std::unique_ptr<MmapInfo> new_mmap(new MmapInfo());
CHECK(mmaps_.empty());
CHECK(rss_kb_ == 0);
// Iterate over all lines in /proc/PID/smaps.
file_utils::LineReader rd(&buf[0], rsize);
for (const char* line = rd.NextLine(); line; line = rd.NextLine()) {
if (!line[0])
continue;
// Performance optimization (hack).
// Any header line starts with lowercase hex digit but subsequent lines
// start with uppercase letter.
if (line[0] < 'A' || line[0] > 'Z') {
// Note that the mapped file name ([stack]) is optional and won't be
// present on anonymous memory maps (hence res >= 3 below).
int res = sscanf(line,
"%" PRIx64 "-%" PRIx64 " %4s %*" PRIx64 " %*[:0-9a-f] "
"%*[0-9a-f]%*[ \t]%127[^\n]",
&new_mmap->start_addr, &new_mmap->end_addr, new_mmap->prot_flags,
new_mmap->mapped_file);
last_mmap_entry = new_mmap.get();
CHECK(new_mmap->end_addr >= new_mmap->start_addr);
new_mmap->virt_kb =
(new_mmap->end_addr - new_mmap->start_addr) / 1024;
if (res == 3)
new_mmap->mapped_file[0] = '\0';
virt_kb_ += new_mmap->virt_kb;
mmaps_.push_back(std::move(new_mmap));
new_mmap.reset(new MmapInfo());
} else {
// The current line is a metrics line within a mmap entry, e.g.:
// Size: 4 kB
uint64_t size = 0;
CHECK(last_mmap_entry);
if (ReadSmapsMetric(line, kRss, sizeof(kRss), &size)) {
last_mmap_entry->rss_kb = size;
rss_kb_ += size;
} else if (ReadSmapsMetric(line, kPss, sizeof(kPss), &size)) {
last_mmap_entry->pss_kb = size;
pss_kb_ += size;
} else if (ReadSmapsMetric(line, kSwap, sizeof(kSwap), &size)) {
last_mmap_entry->swapped_kb = size;
swapped_kb_ += size;
} else if (ReadSmapsMetric(
line, kSharedClean, sizeof(kSharedClean), &size)) {
last_mmap_entry->shared_clean_kb = size;
shared_clean_kb_ += size;
} else if (ReadSmapsMetric(
line, kSharedDirty, sizeof(kSharedDirty), &size)) {
last_mmap_entry->shared_dirty_kb = size;
shared_dirty_kb_ += size;
} else if (ReadSmapsMetric(
line, kPrivateClean, sizeof(kPrivateClean), &size)) {
last_mmap_entry->private_clean_kb = size;
private_clean_kb_ += size;
} else if (ReadSmapsMetric(
line, kPrivateDirty, sizeof(kPrivateDirty), &size)) {
last_mmap_entry->private_dirty_kb = size;
private_dirty_kb_ += size;
}
}
}
full_stats_ = true;
return true;
}
bool ProcessMemoryStats::ReadGpuStats(int pid) {
MemtrackProc mt(pid);
gpu_graphics_kb_ = mt.graphics_total() / 1024;
gpu_graphics_pss_kb_ = mt.graphics_pss() / 1024;
gpu_gl_kb_ = mt.gl_total() / 1024;
gpu_gl_pss_kb_ = mt.gl_pss() / 1024;
gpu_other_kb_ = mt.other_total() / 1024;
gpu_other_pss_kb_ = mt.other_pss() / 1024;
gpu_stats_ = !mt.has_errors() &&
(gpu_graphics_kb_ != 0 || gpu_gl_kb_ != 0 || gpu_other_kb_ != 0);
return gpu_stats_;
}
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