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gecko-dev/xpcom/base/nsMemoryReporterManager.cpp

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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#include "nsAtomTable.h"
#include "nsAutoPtr.h"
#include "nsCOMPtr.h"
#include "nsCOMArray.h"
#include "nsPrintfCString.h"
#include "nsServiceManagerUtils.h"
#include "nsMemoryReporterManager.h"
#include "nsITimer.h"
#include "nsThreadUtils.h"
#include "nsIDOMWindow.h"
#include "nsPIDOMWindow.h"
#include "nsIObserverService.h"
#include "nsIGlobalObject.h"
#include "nsIXPConnect.h"
#if defined(XP_UNIX) || defined(MOZ_DMD)
#include "nsMemoryInfoDumper.h"
#endif
#include "mozilla/Attributes.h"
#include "mozilla/PodOperations.h"
#include "mozilla/Services.h"
#include "mozilla/Telemetry.h"
#include "mozilla/dom/PMemoryReportRequestParent.h" // for dom::MemoryReport
#ifdef XP_WIN
#include <process.h>
#ifndef getpid
#define getpid _getpid
#endif
#else
#include <unistd.h>
#endif
using namespace mozilla;
#if defined(MOZ_MEMORY)
# define HAVE_JEMALLOC_STATS 1
# include "mozmemory.h"
#endif // MOZ_MEMORY
#if defined(XP_LINUX)
#include <string.h>
#include <stdlib.h>
static nsresult
GetProcSelfStatmField(int aField, int64_t* aN)
{
// There are more than two fields, but we're only interested in the first
// two.
static const int MAX_FIELD = 2;
size_t fields[MAX_FIELD];
MOZ_ASSERT(aField < MAX_FIELD, "bad field number");
FILE* f = fopen("/proc/self/statm", "r");
if (f) {
int nread = fscanf(f, "%zu %zu", &fields[0], &fields[1]);
fclose(f);
if (nread == MAX_FIELD) {
*aN = fields[aField] * getpagesize();
return NS_OK;
}
}
return NS_ERROR_FAILURE;
}
static nsresult
GetProcSelfSmapsPrivate(int64_t* aN)
{
// You might be tempted to calculate USS by subtracting the "shared" value
// from the "resident" value in /proc/<pid>/statm. But at least on Linux,
// statm's "shared" value actually counts pages backed by files, which has
// little to do with whether the pages are actually shared. /proc/self/smaps
// on the other hand appears to give us the correct information.
FILE* f = fopen("/proc/self/smaps", "r");
if (NS_WARN_IF(!f)) {
return NS_ERROR_UNEXPECTED;
}
// We carry over the end of the buffer to the beginning to make sure we only
// interpret complete lines.
static const uint32_t carryOver = 32;
static const uint32_t readSize = 4096;
int64_t amount = 0;
char buffer[carryOver + readSize + 1];
// Fill the beginning of the buffer with spaces, as a sentinel for the first
// iteration.
memset(buffer, ' ', carryOver);
for (;;) {
size_t bytes = fread(buffer + carryOver, sizeof(*buffer), readSize, f);
char* end = buffer + bytes;
char* ptr = buffer;
end[carryOver] = '\0';
// We are looking for lines like "Private_{Clean,Dirty}: 4 kB".
while ((ptr = strstr(ptr, "Private"))) {
if (ptr >= end) {
break;
}
ptr += sizeof("Private_Xxxxx:");
amount += strtol(ptr, nullptr, 10);
}
if (bytes < readSize) {
// We do not expect any match within the end of the buffer.
MOZ_ASSERT(!strstr(end, "Private"));
break;
}
// Carry the end of the buffer over to the beginning.
memcpy(buffer, end, carryOver);
}
fclose(f);
// Convert from kB to bytes.
*aN = amount * 1024;
return NS_OK;
}
#define HAVE_VSIZE_AND_RESIDENT_REPORTERS 1
static nsresult
VsizeDistinguishedAmount(int64_t* aN)
{
return GetProcSelfStatmField(0, aN);
}
static nsresult
ResidentDistinguishedAmount(int64_t* aN)
{
return GetProcSelfStatmField(1, aN);
}
static nsresult
ResidentFastDistinguishedAmount(int64_t* aN)
{
return ResidentDistinguishedAmount(aN);
}
#define HAVE_RESIDENT_UNIQUE_REPORTER
static nsresult
ResidentUniqueDistinguishedAmount(int64_t* aN)
{
return GetProcSelfSmapsPrivate(aN);
}
class ResidentUniqueReporter MOZ_FINAL : public nsIMemoryReporter
{
~ResidentUniqueReporter() {}
public:
NS_DECL_ISUPPORTS
NS_METHOD CollectReports(nsIHandleReportCallback* aHandleReport,
nsISupports* aData, bool aAnonymize)
{
int64_t amount = 0;
nsresult rv = ResidentUniqueDistinguishedAmount(&amount);
NS_ENSURE_SUCCESS(rv, rv);
return MOZ_COLLECT_REPORT(
"resident-unique", KIND_OTHER, UNITS_BYTES, amount,
"Memory mapped by the process that is present in physical memory and not "
"shared with any other processes. This is also known as the process's unique "
"set size (USS). This is the amount of RAM we'd expect to be freed if we "
"closed this process.");
}
};
NS_IMPL_ISUPPORTS(ResidentUniqueReporter, nsIMemoryReporter)
#elif defined(__DragonFly__) || defined(__FreeBSD__) \
|| defined(__NetBSD__) || defined(__OpenBSD__) \
|| defined(__FreeBSD_kernel__)
#include <sys/param.h>
#include <sys/sysctl.h>
#if defined(__DragonFly__) || defined(__FreeBSD__) || defined(__FreeBSD_kernel__)
#include <sys/user.h>
#endif
#include <unistd.h>
#if defined(__NetBSD__)
#undef KERN_PROC
#define KERN_PROC KERN_PROC2
#define KINFO_PROC struct kinfo_proc2
#else
#define KINFO_PROC struct kinfo_proc
#endif
#if defined(__DragonFly__)
#define KP_SIZE(kp) (kp.kp_vm_map_size)
#define KP_RSS(kp) (kp.kp_vm_rssize * getpagesize())
#elif defined(__FreeBSD__) || defined(__FreeBSD_kernel__)
#define KP_SIZE(kp) (kp.ki_size)
#define KP_RSS(kp) (kp.ki_rssize * getpagesize())
#elif defined(__NetBSD__)
#define KP_SIZE(kp) (kp.p_vm_msize * getpagesize())
#define KP_RSS(kp) (kp.p_vm_rssize * getpagesize())
#elif defined(__OpenBSD__)
#define KP_SIZE(kp) ((kp.p_vm_dsize + kp.p_vm_ssize \
+ kp.p_vm_tsize) * getpagesize())
#define KP_RSS(kp) (kp.p_vm_rssize * getpagesize())
#endif
static nsresult
GetKinfoProcSelf(KINFO_PROC* aProc)
{
int mib[] = {
CTL_KERN,
KERN_PROC,
KERN_PROC_PID,
getpid(),
#if defined(__NetBSD__) || defined(__OpenBSD__)
sizeof(KINFO_PROC),
1,
#endif
};
u_int miblen = sizeof(mib) / sizeof(mib[0]);
size_t size = sizeof(KINFO_PROC);
if (sysctl(mib, miblen, aProc, &size, nullptr, 0)) {
return NS_ERROR_FAILURE;
}
return NS_OK;
}
#define HAVE_VSIZE_AND_RESIDENT_REPORTERS 1
static nsresult
VsizeDistinguishedAmount(int64_t* aN)
{
KINFO_PROC proc;
nsresult rv = GetKinfoProcSelf(&proc);
if (NS_SUCCEEDED(rv)) {
*aN = KP_SIZE(proc);
}
return rv;
}
static nsresult
ResidentDistinguishedAmount(int64_t* aN)
{
KINFO_PROC proc;
nsresult rv = GetKinfoProcSelf(&proc);
if (NS_SUCCEEDED(rv)) {
*aN = KP_RSS(proc);
}
return rv;
}
static nsresult
ResidentFastDistinguishedAmount(int64_t* aN)
{
return ResidentDistinguishedAmount(aN);
}
#ifdef __FreeBSD__
#include <libutil.h>
#include <algorithm>
static nsresult
GetKinfoVmentrySelf(int64_t* aPrss, uint64_t* aMaxreg)
{
int cnt;
struct kinfo_vmentry* vmmap;
struct kinfo_vmentry* kve;
if (!(vmmap = kinfo_getvmmap(getpid(), &cnt))) {
return NS_ERROR_FAILURE;
}
if (aPrss) {
*aPrss = 0;
}
if (aMaxreg) {
*aMaxreg = 0;
}
for (int i = 0; i < cnt; i++) {
kve = &vmmap[i];
if (aPrss) {
*aPrss += kve->kve_private_resident;
}
if (aMaxreg) {
*aMaxreg = std::max(*aMaxreg, kve->kve_end - kve->kve_start);
}
}
free(vmmap);
return NS_OK;
}
#define HAVE_PRIVATE_REPORTER
static nsresult
PrivateDistinguishedAmount(int64_t* aN)
{
int64_t priv;
nsresult rv = GetKinfoVmentrySelf(&priv, nullptr);
NS_ENSURE_SUCCESS(rv, rv);
*aN = priv * getpagesize();
return NS_OK;
}
#define HAVE_VSIZE_MAX_CONTIGUOUS_REPORTER 1
static nsresult
VsizeMaxContiguousDistinguishedAmount(int64_t* aN)
{
uint64_t biggestRegion;
nsresult rv = GetKinfoVmentrySelf(nullptr, &biggestRegion);
if (NS_SUCCEEDED(rv)) {
*aN = biggestRegion;
}
return NS_OK;
}
#endif // FreeBSD
#elif defined(SOLARIS)
#include <procfs.h>
#include <fcntl.h>
#include <unistd.h>
static void XMappingIter(int64_t& aVsize, int64_t& aResident)
{
aVsize = -1;
aResident = -1;
int mapfd = open("/proc/self/xmap", O_RDONLY);
struct stat st;
prxmap_t* prmapp = nullptr;
if (mapfd >= 0) {
if (!fstat(mapfd, &st)) {
int nmap = st.st_size / sizeof(prxmap_t);
while (1) {
// stat(2) on /proc/<pid>/xmap returns an incorrect value,
// prior to the release of Solaris 11.
// Here is a workaround for it.
nmap *= 2;
prmapp = (prxmap_t*)malloc((nmap + 1) * sizeof(prxmap_t));
if (!prmapp) {
// out of memory
break;
}
int n = pread(mapfd, prmapp, (nmap + 1) * sizeof(prxmap_t), 0);
if (n < 0) {
break;
}
if (nmap >= n / sizeof(prxmap_t)) {
aVsize = 0;
aResident = 0;
for (int i = 0; i < n / sizeof(prxmap_t); i++) {
aVsize += prmapp[i].pr_size;
aResident += prmapp[i].pr_rss * prmapp[i].pr_pagesize;
}
break;
}
free(prmapp);
}
free(prmapp);
}
close(mapfd);
}
}
#define HAVE_VSIZE_AND_RESIDENT_REPORTERS 1
static nsresult
VsizeDistinguishedAmount(int64_t* aN)
{
int64_t vsize, resident;
XMappingIter(vsize, resident);
if (vsize == -1) {
return NS_ERROR_FAILURE;
}
*aN = vsize;
return NS_OK;
}
static nsresult
ResidentDistinguishedAmount(int64_t* aN)
{
int64_t vsize, resident;
XMappingIter(vsize, resident);
if (resident == -1) {
return NS_ERROR_FAILURE;
}
*aN = resident;
return NS_OK;
}
static nsresult
ResidentFastDistinguishedAmount(int64_t* aN)
{
return ResidentDistinguishedAmount(aN);
}
#elif defined(XP_MACOSX)
#include <mach/mach_init.h>
#include <mach/task.h>
static bool
GetTaskBasicInfo(struct task_basic_info* aTi)
{
mach_msg_type_number_t count = TASK_BASIC_INFO_COUNT;
kern_return_t kr = task_info(mach_task_self(), TASK_BASIC_INFO,
(task_info_t)aTi, &count);
return kr == KERN_SUCCESS;
}
// The VSIZE figure on Mac includes huge amounts of shared memory and is always
// absurdly high, eg. 2GB+ even at start-up. But both 'top' and 'ps' report
// it, so we might as well too.
#define HAVE_VSIZE_AND_RESIDENT_REPORTERS 1
static nsresult
VsizeDistinguishedAmount(int64_t* aN)
{
task_basic_info ti;
if (!GetTaskBasicInfo(&ti)) {
return NS_ERROR_FAILURE;
}
*aN = ti.virtual_size;
return NS_OK;
}
// If we're using jemalloc on Mac, we need to instruct jemalloc to purge the
// pages it has madvise(MADV_FREE)'d before we read our RSS in order to get
// an accurate result. The OS will take away MADV_FREE'd pages when there's
// memory pressure, so ideally, they shouldn't count against our RSS.
//
// Purging these pages can take a long time for some users (see bug 789975),
// so we provide the option to get the RSS without purging first.
static nsresult
ResidentDistinguishedAmountHelper(int64_t* aN, bool aDoPurge)
{
#ifdef HAVE_JEMALLOC_STATS
if (aDoPurge) {
Telemetry::AutoTimer<Telemetry::MEMORY_FREE_PURGED_PAGES_MS> timer;
jemalloc_purge_freed_pages();
}
#endif
task_basic_info ti;
if (!GetTaskBasicInfo(&ti)) {
return NS_ERROR_FAILURE;
}
*aN = ti.resident_size;
return NS_OK;
}
static nsresult
ResidentFastDistinguishedAmount(int64_t* aN)
{
return ResidentDistinguishedAmountHelper(aN, /* doPurge = */ false);
}
static nsresult
ResidentDistinguishedAmount(int64_t* aN)
{
return ResidentDistinguishedAmountHelper(aN, /* doPurge = */ true);
}
#elif defined(XP_WIN)
#include <windows.h>
#include <psapi.h>
#include <algorithm>
#define HAVE_VSIZE_AND_RESIDENT_REPORTERS 1
static nsresult
VsizeDistinguishedAmount(int64_t* aN)
{
MEMORYSTATUSEX s;
s.dwLength = sizeof(s);
if (!GlobalMemoryStatusEx(&s)) {
return NS_ERROR_FAILURE;
}
*aN = s.ullTotalVirtual - s.ullAvailVirtual;
return NS_OK;
}
static nsresult
ResidentDistinguishedAmount(int64_t* aN)
{
PROCESS_MEMORY_COUNTERS pmc;
pmc.cb = sizeof(PROCESS_MEMORY_COUNTERS);
if (!GetProcessMemoryInfo(GetCurrentProcess(), &pmc, sizeof(pmc))) {
return NS_ERROR_FAILURE;
}
*aN = pmc.WorkingSetSize;
return NS_OK;
}
static nsresult
ResidentFastDistinguishedAmount(int64_t* aN)
{
return ResidentDistinguishedAmount(aN);
}
#define HAVE_VSIZE_MAX_CONTIGUOUS_REPORTER 1
static nsresult
VsizeMaxContiguousDistinguishedAmount(int64_t* aN)
{
SIZE_T biggestRegion = 0;
MEMORY_BASIC_INFORMATION vmemInfo = { 0 };
for (size_t currentAddress = 0; ; ) {
if (!VirtualQuery((LPCVOID)currentAddress, &vmemInfo, sizeof(vmemInfo))) {
// Something went wrong, just return whatever we've got already.
break;
}
if (vmemInfo.State == MEM_FREE) {
biggestRegion = std::max(biggestRegion, vmemInfo.RegionSize);
}
SIZE_T lastAddress = currentAddress;
currentAddress += vmemInfo.RegionSize;
// If we overflow, we've examined all of the address space.
if (currentAddress < lastAddress) {
break;
}
}
*aN = biggestRegion;
return NS_OK;
}
#define HAVE_PRIVATE_REPORTER
static nsresult
PrivateDistinguishedAmount(int64_t* aN)
{
PROCESS_MEMORY_COUNTERS_EX pmcex;
pmcex.cb = sizeof(PROCESS_MEMORY_COUNTERS_EX);
if (!GetProcessMemoryInfo(GetCurrentProcess(),
(PPROCESS_MEMORY_COUNTERS) &pmcex, sizeof(pmcex))) {
return NS_ERROR_FAILURE;
}
*aN = pmcex.PrivateUsage;
return NS_OK;
}
#endif // XP_<PLATFORM>
#ifdef HAVE_VSIZE_MAX_CONTIGUOUS_REPORTER
class VsizeMaxContiguousReporter MOZ_FINAL : public nsIMemoryReporter
{
~VsizeMaxContiguousReporter() {}
public:
NS_DECL_ISUPPORTS
NS_METHOD CollectReports(nsIHandleReportCallback* aHandleReport,
nsISupports* aData, bool aAnonymize)
{
int64_t amount;
nsresult rv = VsizeMaxContiguousDistinguishedAmount(&amount);
NS_ENSURE_SUCCESS(rv, rv);
return MOZ_COLLECT_REPORT(
"vsize-max-contiguous", KIND_OTHER, UNITS_BYTES, amount,
"Size of the maximum contiguous block of available virtual "
"memory.");
}
};
NS_IMPL_ISUPPORTS(VsizeMaxContiguousReporter, nsIMemoryReporter)
#endif
#ifdef HAVE_PRIVATE_REPORTER
class PrivateReporter MOZ_FINAL : public nsIMemoryReporter
{
~PrivateReporter() {}
public:
NS_DECL_ISUPPORTS
NS_METHOD CollectReports(nsIHandleReportCallback* aHandleReport,
nsISupports* aData, bool aAnonymize)
{
int64_t amount;
nsresult rv = PrivateDistinguishedAmount(&amount);
NS_ENSURE_SUCCESS(rv, rv);
return MOZ_COLLECT_REPORT(
"private", KIND_OTHER, UNITS_BYTES, amount,
"Memory that cannot be shared with other processes, including memory that is "
"committed and marked MEM_PRIVATE, data that is not mapped, and executable "
"pages that have been written to.");
}
};
NS_IMPL_ISUPPORTS(PrivateReporter, nsIMemoryReporter)
#endif
#ifdef HAVE_VSIZE_AND_RESIDENT_REPORTERS
class VsizeReporter MOZ_FINAL : public nsIMemoryReporter
{
~VsizeReporter() {}
public:
NS_DECL_ISUPPORTS
NS_METHOD CollectReports(nsIHandleReportCallback* aHandleReport,
nsISupports* aData, bool aAnonymize)
{
int64_t amount;
nsresult rv = VsizeDistinguishedAmount(&amount);
NS_ENSURE_SUCCESS(rv, rv);
return MOZ_COLLECT_REPORT(
"vsize", KIND_OTHER, UNITS_BYTES, amount,
"Memory mapped by the process, including code and data segments, the heap, "
"thread stacks, memory explicitly mapped by the process via mmap and similar "
"operations, and memory shared with other processes. This is the vsize figure "
"as reported by 'top' and 'ps'. This figure is of limited use on Mac, where "
"processes share huge amounts of memory with one another. But even on other "
"operating systems, 'resident' is a much better measure of the memory "
"resources used by the process.");
}
};
NS_IMPL_ISUPPORTS(VsizeReporter, nsIMemoryReporter)
class ResidentReporter MOZ_FINAL : public nsIMemoryReporter
{
~ResidentReporter() {}
public:
NS_DECL_ISUPPORTS
NS_METHOD CollectReports(nsIHandleReportCallback* aHandleReport,
nsISupports* aData, bool aAnonymize)
{
int64_t amount;
nsresult rv = ResidentDistinguishedAmount(&amount);
NS_ENSURE_SUCCESS(rv, rv);
return MOZ_COLLECT_REPORT(
"resident", KIND_OTHER, UNITS_BYTES, amount,
"Memory mapped by the process that is present in physical memory, also known "
"as the resident set size (RSS). This is the best single figure to use when "
"considering the memory resources used by the process, but it depends both on "
"other processes being run and details of the OS kernel and so is best used "
"for comparing the memory usage of a single process at different points in "
"time.");
}
};
NS_IMPL_ISUPPORTS(ResidentReporter, nsIMemoryReporter)
#endif // HAVE_VSIZE_AND_RESIDENT_REPORTERS
#ifdef XP_UNIX
#include <sys/resource.h>
#define HAVE_PAGE_FAULT_REPORTERS 1
class PageFaultsSoftReporter MOZ_FINAL : public nsIMemoryReporter
{
~PageFaultsSoftReporter() {}
public:
NS_DECL_ISUPPORTS
NS_METHOD CollectReports(nsIHandleReportCallback* aHandleReport,
nsISupports* aData, bool aAnonymize)
{
struct rusage usage;
int err = getrusage(RUSAGE_SELF, &usage);
if (err != 0) {
return NS_ERROR_FAILURE;
}
int64_t amount = usage.ru_minflt;
return MOZ_COLLECT_REPORT(
"page-faults-soft", KIND_OTHER, UNITS_COUNT_CUMULATIVE, amount,
"The number of soft page faults (also known as 'minor page faults') that "
"have occurred since the process started. A soft page fault occurs when the "
"process tries to access a page which is present in physical memory but is "
"not mapped into the process's address space. For instance, a process might "
"observe soft page faults when it loads a shared library which is already "
"present in physical memory. A process may experience many thousands of soft "
"page faults even when the machine has plenty of available physical memory, "
"and because the OS services a soft page fault without accessing the disk, "
"they impact performance much less than hard page faults.");
}
};
NS_IMPL_ISUPPORTS(PageFaultsSoftReporter, nsIMemoryReporter)
static nsresult
PageFaultsHardDistinguishedAmount(int64_t* aAmount)
{
struct rusage usage;
int err = getrusage(RUSAGE_SELF, &usage);
if (err != 0) {
return NS_ERROR_FAILURE;
}
*aAmount = usage.ru_majflt;
return NS_OK;
}
class PageFaultsHardReporter MOZ_FINAL : public nsIMemoryReporter
{
~PageFaultsHardReporter() {}
public:
NS_DECL_ISUPPORTS
NS_METHOD CollectReports(nsIHandleReportCallback* aHandleReport,
nsISupports* aData, bool aAnonymize)
{
int64_t amount = 0;
nsresult rv = PageFaultsHardDistinguishedAmount(&amount);
NS_ENSURE_SUCCESS(rv, rv);
return MOZ_COLLECT_REPORT(
"page-faults-hard", KIND_OTHER, UNITS_COUNT_CUMULATIVE, amount,
"The number of hard page faults (also known as 'major page faults') that have "
"occurred since the process started. A hard page fault occurs when a process "
"tries to access a page which is not present in physical memory. The "
"operating system must access the disk in order to fulfill a hard page fault. "
"When memory is plentiful, you should see very few hard page faults. But if "
"the process tries to use more memory than your machine has available, you "
"may see many thousands of hard page faults. Because accessing the disk is up "
"to a million times slower than accessing RAM, the program may run very "
"slowly when it is experiencing more than 100 or so hard page faults a "
"second.");
}
};
NS_IMPL_ISUPPORTS(PageFaultsHardReporter, nsIMemoryReporter)
#endif // HAVE_PAGE_FAULT_REPORTERS
/**
** memory reporter implementation for jemalloc and OSX malloc,
** to obtain info on total memory in use (that we know about,
** at least -- on OSX, there are sometimes other zones in use).
**/
#ifdef HAVE_JEMALLOC_STATS
// This has UNITS_PERCENTAGE, so it is multiplied by 100.
static int64_t
HeapOverheadRatio(jemalloc_stats_t* aStats)
{
return (int64_t)10000 *
(aStats->waste + aStats->bookkeeping + aStats->page_cache) /
((double)aStats->allocated);
}
class JemallocHeapReporter MOZ_FINAL : public nsIMemoryReporter
{
~JemallocHeapReporter() {}
public:
NS_DECL_ISUPPORTS
NS_METHOD CollectReports(nsIHandleReportCallback* aHandleReport,
nsISupports* aData, bool aAnonymize)
{
jemalloc_stats_t stats;
jemalloc_stats(&stats);
nsresult rv;
rv = MOZ_COLLECT_REPORT(
"heap-allocated", KIND_OTHER, UNITS_BYTES, stats.allocated,
"Memory mapped by the heap allocator that is currently allocated to the "
"application. This may exceed the amount of memory requested by the "
"application because the allocator regularly rounds up request sizes. (The "
"exact amount requested is not recorded.)");
NS_ENSURE_SUCCESS(rv, rv);
// We mark this and the other heap-overhead reporters as KIND_NONHEAP
// because KIND_HEAP memory means "counted in heap-allocated", which
// this is not.
rv = MOZ_COLLECT_REPORT(
"explicit/heap-overhead/bin-unused", KIND_NONHEAP, UNITS_BYTES,
stats.bin_unused,
"Bytes reserved for bins of fixed-size allocations which do not correspond to "
"an active allocation.");
NS_ENSURE_SUCCESS(rv, rv);
rv = MOZ_COLLECT_REPORT(
"explicit/heap-overhead/waste", KIND_NONHEAP, UNITS_BYTES,
stats.waste,
"Committed bytes which do not correspond to an active allocation and which the "
"allocator is not intentionally keeping alive (i.e., not 'heap-bookkeeping' or "
"'heap-page-cache' or 'heap-bin-unused'). Although the allocator will waste "
"some space under any circumstances, a large value here may indicate that the "
"heap is highly fragmented, or that allocator is performing poorly for some "
"other reason.");
NS_ENSURE_SUCCESS(rv, rv);
rv = MOZ_COLLECT_REPORT(
"explicit/heap-overhead/bookkeeping", KIND_NONHEAP, UNITS_BYTES,
stats.bookkeeping,
"Committed bytes which the heap allocator uses for internal data structures.");
NS_ENSURE_SUCCESS(rv, rv);
rv = MOZ_COLLECT_REPORT(
"explicit/heap-overhead/page-cache", KIND_NONHEAP, UNITS_BYTES,
stats.page_cache,
"Memory which the allocator could return to the operating system, but hasn't. "
"The allocator keeps this memory around as an optimization, so it doesn't "
"have to ask the OS the next time it needs to fulfill a request. This value "
"is typically not larger than a few megabytes.");
NS_ENSURE_SUCCESS(rv, rv);
rv = MOZ_COLLECT_REPORT(
"heap-committed", KIND_OTHER, UNITS_BYTES,
stats.allocated + stats.waste + stats.bookkeeping + stats.page_cache,
"Memory mapped by the heap allocator that is committed, i.e. in physical "
"memory or paged to disk. This value corresponds to 'heap-allocated' + "
"'heap-waste' + 'heap-bookkeeping' + 'heap-page-cache', but because "
"these values are read at different times, the result probably won't match "
"exactly.");
NS_ENSURE_SUCCESS(rv, rv);
rv = MOZ_COLLECT_REPORT(
"heap-overhead-ratio", KIND_OTHER, UNITS_PERCENTAGE,
HeapOverheadRatio(&stats),
"Ratio of committed, unused bytes to allocated bytes; i.e., "
"'heap-overhead' / 'heap-allocated'. This measures the overhead of "
"the heap allocator relative to amount of memory allocated.");
NS_ENSURE_SUCCESS(rv, rv);
rv = MOZ_COLLECT_REPORT(
"heap-mapped", KIND_OTHER, UNITS_BYTES, stats.mapped,
"Amount of memory currently mapped.");
NS_ENSURE_SUCCESS(rv, rv);
rv = MOZ_COLLECT_REPORT(
"heap-chunksize", KIND_OTHER, UNITS_BYTES, stats.chunksize,
"Size of chunks.");
NS_ENSURE_SUCCESS(rv, rv);
rv = MOZ_COLLECT_REPORT(
"heap-chunks", KIND_OTHER, UNITS_COUNT, (stats.mapped / stats.chunksize),
"Number of chunks currently mapped.");
NS_ENSURE_SUCCESS(rv, rv);
return NS_OK;
}
};
NS_IMPL_ISUPPORTS(JemallocHeapReporter, nsIMemoryReporter)
#endif // HAVE_JEMALLOC_STATS
// Why is this here? At first glance, you'd think it could be defined and
// registered with nsMemoryReporterManager entirely within nsAtomTable.cpp.
// However, the obvious time to register it is when the table is initialized,
// and that happens before XPCOM components are initialized, which means the
// RegisterStrongMemoryReporter call fails. So instead we do it here.
class AtomTablesReporter MOZ_FINAL : public nsIMemoryReporter
{
MOZ_DEFINE_MALLOC_SIZE_OF(MallocSizeOf)
~AtomTablesReporter() {}
public:
NS_DECL_ISUPPORTS
NS_METHOD CollectReports(nsIHandleReportCallback* aHandleReport,
nsISupports* aData, bool aAnonymize)
{
size_t Main, Static;
NS_SizeOfAtomTablesIncludingThis(MallocSizeOf, &Main, &Static);
nsresult rv;
rv = MOZ_COLLECT_REPORT(
"explicit/atom-tables/main", KIND_HEAP, UNITS_BYTES, Main,
"Memory used by the main atoms table.");
NS_ENSURE_SUCCESS(rv, rv);
rv = MOZ_COLLECT_REPORT(
"explicit/atom-tables/static", KIND_HEAP, UNITS_BYTES, Static,
"Memory used by the static atoms table.");
NS_ENSURE_SUCCESS(rv, rv);
return NS_OK;
}
};
NS_IMPL_ISUPPORTS(AtomTablesReporter, nsIMemoryReporter)
#ifdef DEBUG
// Ideally, this would be implemented in BlockingResourceBase.cpp.
// However, this ends up breaking the linking step of various unit tests due
// to adding a new dependency to libdmd for a commonly used feature (mutexes)
// in DMD builds. So instead we do it here.
class DeadlockDetectorReporter MOZ_FINAL : public nsIMemoryReporter
{
MOZ_DEFINE_MALLOC_SIZE_OF(MallocSizeOf)
~DeadlockDetectorReporter() {}
public:
NS_DECL_ISUPPORTS
NS_METHOD CollectReports(nsIHandleReportCallback* aHandleReport,
nsISupports* aData, bool aAnonymize)
{
return MOZ_COLLECT_REPORT(
"explicit/deadlock-detector", KIND_HEAP, UNITS_BYTES,
BlockingResourceBase::SizeOfDeadlockDetector(MallocSizeOf),
"Memory used by the deadlock detector.");
}
};
NS_IMPL_ISUPPORTS(DeadlockDetectorReporter, nsIMemoryReporter)
#endif
#ifdef MOZ_DMD
namespace mozilla {
namespace dmd {
class DMDReporter MOZ_FINAL : public nsIMemoryReporter
{
public:
NS_DECL_ISUPPORTS
NS_IMETHOD CollectReports(nsIHandleReportCallback* aHandleReport,
nsISupports* aData, bool aAnonymize)
{
dmd::Sizes sizes;
dmd::SizeOf(&sizes);
#define REPORT(_path, _amount, _desc) \
do { \
nsresult rv; \
rv = aHandleReport->Callback(EmptyCString(), NS_LITERAL_CSTRING(_path), \
KIND_HEAP, UNITS_BYTES, _amount, \
NS_LITERAL_CSTRING(_desc), aData); \
if (NS_WARN_IF(NS_FAILED(rv))) { \
return rv; \
} \
} while (0)
REPORT("explicit/dmd/stack-traces/used",
sizes.mStackTracesUsed,
"Memory used by stack traces which correspond to at least "
"one heap block DMD is tracking.");
REPORT("explicit/dmd/stack-traces/unused",
sizes.mStackTracesUnused,
"Memory used by stack traces which don't correspond to any heap "
"blocks DMD is currently tracking.");
REPORT("explicit/dmd/stack-traces/table",
sizes.mStackTraceTable,
"Memory used by DMD's stack trace table.");
REPORT("explicit/dmd/block-table",
sizes.mBlockTable,
"Memory used by DMD's live block table.");
#undef REPORT
return NS_OK;
}
private:
~DMDReporter() {}
};
NS_IMPL_ISUPPORTS(DMDReporter, nsIMemoryReporter)
} // namespace dmd
} // namespace mozilla
#endif // MOZ_DMD
/**
** nsMemoryReporterManager implementation
**/
NS_IMPL_ISUPPORTS(nsMemoryReporterManager, nsIMemoryReporterManager)
NS_IMETHODIMP
nsMemoryReporterManager::Init()
{
#if defined(HAVE_JEMALLOC_STATS) && defined(XP_LINUX)
if (!jemalloc_stats) {
return NS_ERROR_FAILURE;
}
#endif
#ifdef HAVE_JEMALLOC_STATS
RegisterStrongReporter(new JemallocHeapReporter());
#endif
#ifdef HAVE_VSIZE_AND_RESIDENT_REPORTERS
RegisterStrongReporter(new VsizeReporter());
RegisterStrongReporter(new ResidentReporter());
#endif
#ifdef HAVE_VSIZE_MAX_CONTIGUOUS_REPORTER
RegisterStrongReporter(new VsizeMaxContiguousReporter());
#endif
#ifdef HAVE_RESIDENT_UNIQUE_REPORTER
RegisterStrongReporter(new ResidentUniqueReporter());
#endif
#ifdef HAVE_PAGE_FAULT_REPORTERS
RegisterStrongReporter(new PageFaultsSoftReporter());
RegisterStrongReporter(new PageFaultsHardReporter());
#endif
#ifdef HAVE_PRIVATE_REPORTER
RegisterStrongReporter(new PrivateReporter());
#endif
RegisterStrongReporter(new AtomTablesReporter());
#ifdef DEBUG
RegisterStrongReporter(new DeadlockDetectorReporter());
#endif
#ifdef MOZ_DMD
RegisterStrongReporter(new mozilla::dmd::DMDReporter());
#endif
#ifdef XP_UNIX
nsMemoryInfoDumper::Initialize();
#endif
return NS_OK;
}
nsMemoryReporterManager::nsMemoryReporterManager()
: mMutex("nsMemoryReporterManager::mMutex")
, mIsRegistrationBlocked(false)
, mStrongReporters(new StrongReportersTable())
, mWeakReporters(new WeakReportersTable())
, mSavedStrongReporters(nullptr)
, mSavedWeakReporters(nullptr)
, mNumChildProcesses(0)
, mNextGeneration(1)
, mGetReportsState(nullptr)
{
}
nsMemoryReporterManager::~nsMemoryReporterManager()
{
delete mStrongReporters;
delete mWeakReporters;
NS_ASSERTION(!mSavedStrongReporters, "failed to restore strong reporters");
NS_ASSERTION(!mSavedWeakReporters, "failed to restore weak reporters");
}
//#define DEBUG_CHILD_PROCESS_MEMORY_REPORTING 1
#ifdef DEBUG_CHILD_PROCESS_MEMORY_REPORTING
#define MEMORY_REPORTING_LOG(format, ...) \
fprintf(stderr, "++++ MEMORY REPORTING: " format, ##__VA_ARGS__);
#else
#define MEMORY_REPORTING_LOG(...)
#endif
void
nsMemoryReporterManager::IncrementNumChildProcesses()
{
if (!NS_IsMainThread()) {
MOZ_CRASH();
}
mNumChildProcesses++;
MEMORY_REPORTING_LOG("IncrementNumChildProcesses --> %d\n",
mNumChildProcesses);
}
void
nsMemoryReporterManager::DecrementNumChildProcesses()
{
if (!NS_IsMainThread()) {
MOZ_CRASH();
}
MOZ_ASSERT(mNumChildProcesses > 0);
mNumChildProcesses--;
MEMORY_REPORTING_LOG("DecrementNumChildProcesses --> %d\n",
mNumChildProcesses);
}
NS_IMETHODIMP
nsMemoryReporterManager::GetReports(
nsIHandleReportCallback* aHandleReport,
nsISupports* aHandleReportData,
nsIFinishReportingCallback* aFinishReporting,
nsISupports* aFinishReportingData,
bool aAnonymize)
{
return GetReportsExtended(aHandleReport, aHandleReportData,
aFinishReporting, aFinishReportingData,
aAnonymize,
/* minimize = */ false,
/* DMDident = */ EmptyString());
}
NS_IMETHODIMP
nsMemoryReporterManager::GetReportsExtended(
nsIHandleReportCallback* aHandleReport,
nsISupports* aHandleReportData,
nsIFinishReportingCallback* aFinishReporting,
nsISupports* aFinishReportingData,
bool aAnonymize,
bool aMinimize,
const nsAString& aDMDDumpIdent)
{
nsresult rv;
// Memory reporters are not necessarily threadsafe, so this function must
// be called from the main thread.
if (!NS_IsMainThread()) {
MOZ_CRASH();
}
uint32_t generation = mNextGeneration++;
if (mGetReportsState) {
// A request is in flight. Don't start another one. And don't report
// an error; just ignore it, and let the in-flight request finish.
MEMORY_REPORTING_LOG("GetReports (gen=%u, s->gen=%u): abort\n",
generation, mGetReportsState->mGeneration);
return NS_OK;
}
MEMORY_REPORTING_LOG("GetReports (gen=%u, %d child(ren) present)\n",
generation, mNumChildProcesses);
if (mNumChildProcesses > 0) {
// Request memory reports from child processes. We do this *before*
// collecting reports for this process so each process can collect
// reports in parallel.
nsCOMPtr<nsIObserverService> obs =
do_GetService("@mozilla.org/observer-service;1");
NS_ENSURE_STATE(obs);
nsPrintfCString genStr("generation=%x anonymize=%d minimize=%d DMDident=",
generation, aAnonymize ? 1 : 0, aMinimize ? 1 : 0);
nsAutoString msg = NS_ConvertUTF8toUTF16(genStr);
msg += aDMDDumpIdent;
obs->NotifyObservers(nullptr, "child-memory-reporter-request",
msg.get());
nsCOMPtr<nsITimer> timer = do_CreateInstance(NS_TIMER_CONTRACTID);
NS_ENSURE_TRUE(timer, NS_ERROR_FAILURE);
rv = timer->InitWithFuncCallback(TimeoutCallback,
this, kTimeoutLengthMS,
nsITimer::TYPE_ONE_SHOT);
NS_ENSURE_SUCCESS(rv, rv);
mGetReportsState = new GetReportsState(generation,
aAnonymize,
timer,
mNumChildProcesses,
aHandleReport,
aHandleReportData,
aFinishReporting,
aFinishReportingData,
aDMDDumpIdent);
} else {
mGetReportsState = new GetReportsState(generation,
aAnonymize,
nullptr,
/* mNumChildProcesses = */ 0,
aHandleReport,
aHandleReportData,
aFinishReporting,
aFinishReportingData,
aDMDDumpIdent);
}
if (aMinimize) {
rv = MinimizeMemoryUsage(NS_NewRunnableMethod(
this, &nsMemoryReporterManager::StartGettingReports));
} else {
rv = StartGettingReports();
}
return rv;
}
nsresult
nsMemoryReporterManager::StartGettingReports()
{
GetReportsState* s = mGetReportsState;
// Get reports for this process.
FILE* parentDMDFile = nullptr;
#ifdef MOZ_DMD
if (!s->mDMDDumpIdent.IsEmpty()) {
nsresult rv = nsMemoryInfoDumper::OpenDMDFile(s->mDMDDumpIdent, getpid(),
&parentDMDFile);
if (NS_WARN_IF(NS_FAILED(rv))) {
// Proceed with the memory report as if DMD were disabled.
parentDMDFile = nullptr;
}
}
#endif
GetReportsForThisProcessExtended(s->mHandleReport, s->mHandleReportData,
s->mAnonymize, parentDMDFile);
s->mParentDone = true;
// If there are no remaining child processes, we can finish up immediately.
return (s->mNumChildProcessesCompleted >= s->mNumChildProcesses) ?
FinishReporting() : NS_OK;
}
typedef nsCOMArray<nsIMemoryReporter> MemoryReporterArray;
static PLDHashOperator
StrongEnumerator(nsRefPtrHashKey<nsIMemoryReporter>* aElem, void* aData)
{
MemoryReporterArray* allReporters = static_cast<MemoryReporterArray*>(aData);
allReporters->AppendElement(aElem->GetKey());
return PL_DHASH_NEXT;
}
static PLDHashOperator
WeakEnumerator(nsPtrHashKey<nsIMemoryReporter>* aElem, void* aData)
{
MemoryReporterArray* allReporters = static_cast<MemoryReporterArray*>(aData);
allReporters->AppendElement(aElem->GetKey());
return PL_DHASH_NEXT;
}
NS_IMETHODIMP
nsMemoryReporterManager::GetReportsForThisProcess(
nsIHandleReportCallback* aHandleReport,
nsISupports* aHandleReportData, bool aAnonymize)
{
return GetReportsForThisProcessExtended(aHandleReport, aHandleReportData,
aAnonymize, nullptr);
}
NS_IMETHODIMP
nsMemoryReporterManager::GetReportsForThisProcessExtended(
nsIHandleReportCallback* aHandleReport, nsISupports* aHandleReportData,
bool aAnonymize, FILE* aDMDFile)
{
// Memory reporters are not necessarily threadsafe, so this function must
// be called from the main thread.
if (!NS_IsMainThread()) {
MOZ_CRASH();
}
#ifdef MOZ_DMD
if (aDMDFile) {
// Clear DMD's reportedness state before running the memory
// reporters, to avoid spurious twice-reported warnings.
dmd::ClearReports();
}
#else
MOZ_ASSERT(!aDMDFile);
#endif
MemoryReporterArray allReporters;
{
mozilla::MutexAutoLock autoLock(mMutex);
mStrongReporters->EnumerateEntries(StrongEnumerator, &allReporters);
mWeakReporters->EnumerateEntries(WeakEnumerator, &allReporters);
}
for (uint32_t i = 0; i < allReporters.Length(); i++) {
allReporters[i]->CollectReports(aHandleReport, aHandleReportData,
aAnonymize);
}
#ifdef MOZ_DMD
if (aDMDFile) {
return nsMemoryInfoDumper::DumpDMDToFile(aDMDFile);
}
#endif
return NS_OK;
}
// This function has no return value. If something goes wrong, there's no
// clear place to report the problem to, but that's ok -- we will end up
// hitting the timeout and executing TimeoutCallback().
void
nsMemoryReporterManager::HandleChildReports(
const uint32_t& aGeneration,
const InfallibleTArray<dom::MemoryReport>& aChildReports)
{
// Memory reporting only happens on the main thread.
if (!NS_IsMainThread()) {
MOZ_CRASH();
}
GetReportsState* s = mGetReportsState;
if (!s) {
// If we reach here, either:
//
// - A child process reported back too late, and no subsequent request
// is in flight.
//
// - (Unlikely) A "child-memory-reporter-request" notification was
// triggered from somewhere other than GetReports(), causing child
// processes to report back when the nsMemoryReporterManager wasn't
// expecting it.
//
// Either way, there's nothing to be done. Just ignore it.
MEMORY_REPORTING_LOG(
"HandleChildReports: no request in flight (aGen=%u)\n",
aGeneration);
return;
}
if (aGeneration != s->mGeneration) {
// If we reach here, a child process must have reported back, too late,
// while a subsequent (higher-numbered) request is in flight. Again,
// ignore it.
MOZ_ASSERT(aGeneration < s->mGeneration);
MEMORY_REPORTING_LOG(
"HandleChildReports: gen mismatch (aGen=%u, s->gen=%u)\n",
aGeneration, s->mGeneration);
return;
}
// Process the reports from the child process.
for (uint32_t i = 0; i < aChildReports.Length(); i++) {
const dom::MemoryReport& r = aChildReports[i];
// Child reports should have a non-empty process.
MOZ_ASSERT(!r.process().IsEmpty());
// If the call fails, ignore and continue.
s->mHandleReport->Callback(r.process(), r.path(), r.kind(),
r.units(), r.amount(), r.desc(),
s->mHandleReportData);
}
// If all the child processes have reported, we can cancel the timer and
// finish up. Otherwise, just return.
s->mNumChildProcessesCompleted++;
MEMORY_REPORTING_LOG("HandleChildReports (aGen=%u): completed child %d\n",
aGeneration, s->mNumChildProcessesCompleted);
if (s->mNumChildProcessesCompleted >= s->mNumChildProcesses &&
s->mParentDone) {
s->mTimer->Cancel();
FinishReporting();
}
}
/* static */ void
nsMemoryReporterManager::TimeoutCallback(nsITimer* aTimer, void* aData)
{
nsMemoryReporterManager* mgr = static_cast<nsMemoryReporterManager*>(aData);
GetReportsState* s = mgr->mGetReportsState;
MOZ_ASSERT(mgr->mGetReportsState);
MEMORY_REPORTING_LOG("TimeoutCallback (s->gen=%u)\n",
s->mGeneration);
// We don't bother sending any kind of cancellation message to the child
// processes that haven't reported back.
if (s->mParentDone) {
mgr->FinishReporting();
} else {
// This is unlikely -- the timeout expired during MinimizeMemoryUsage.
MEMORY_REPORTING_LOG("Timeout expired before parent report started!");
// Let the parent continue with its report, but ensure that
// StartGettingReports gives up immediately after that.
s->mNumChildProcesses = s->mNumChildProcessesCompleted;
}
}
nsresult
nsMemoryReporterManager::FinishReporting()
{
// Memory reporting only happens on the main thread.
if (!NS_IsMainThread()) {
MOZ_CRASH();
}
MOZ_ASSERT(mGetReportsState);
MEMORY_REPORTING_LOG("FinishReporting (s->gen=%u)\n",
mGetReportsState->mGeneration);
// Call this before deleting |mGetReportsState|. That way, if
// |mFinishReportData| calls GetReports(), it will silently abort, as
// required.
nsresult rv = mGetReportsState->mFinishReporting->Callback(
mGetReportsState->mFinishReportingData);
delete mGetReportsState;
mGetReportsState = nullptr;
return rv;
}
static void
CrashIfRefcountIsZero(nsISupports* aObj)
{
// This will probably crash if the object's refcount is 0.
uint32_t refcnt = NS_ADDREF(aObj);
if (refcnt <= 1) {
MOZ_CRASH("CrashIfRefcountIsZero: refcount is zero");
}
NS_RELEASE(aObj);
}
nsresult
nsMemoryReporterManager::RegisterReporterHelper(
nsIMemoryReporter* aReporter, bool aForce, bool aStrong)
{
// This method is thread-safe.
mozilla::MutexAutoLock autoLock(mMutex);
if (mIsRegistrationBlocked && !aForce) {
return NS_ERROR_FAILURE;
}
if (mStrongReporters->Contains(aReporter) ||
mWeakReporters->Contains(aReporter)) {
return NS_ERROR_FAILURE;
}
// If |aStrong| is true, |aReporter| may have a refcnt of 0, so we take
// a kung fu death grip before calling PutEntry. Otherwise, if PutEntry
// addref'ed and released |aReporter| before finally addref'ing it for
// good, it would free aReporter! The kung fu death grip could itself be
// problematic if PutEntry didn't addref |aReporter| (because then when the
// death grip goes out of scope, we would delete the reporter). In debug
// mode, we check that this doesn't happen.
//
// If |aStrong| is false, we require that |aReporter| have a non-zero
// refcnt.
//
if (aStrong) {
nsCOMPtr<nsIMemoryReporter> kungFuDeathGrip = aReporter;
mStrongReporters->PutEntry(aReporter);
CrashIfRefcountIsZero(aReporter);
} else {
CrashIfRefcountIsZero(aReporter);
nsCOMPtr<nsIXPConnectWrappedJS> jsComponent = do_QueryInterface(aReporter);
if (jsComponent) {
// We cannot allow non-native reporters (WrappedJS), since we'll be
// holding onto a raw pointer, which would point to the wrapper,
// and that wrapper is likely to go away as soon as this register
// call finishes. This would then lead to subsequent crashes in
// CollectReports().
return NS_ERROR_XPC_BAD_CONVERT_JS;
}
mWeakReporters->PutEntry(aReporter);
}
return NS_OK;
}
NS_IMETHODIMP
nsMemoryReporterManager::RegisterStrongReporter(nsIMemoryReporter* aReporter)
{
return RegisterReporterHelper(aReporter, /* force = */ false,
/* strong = */ true);
}
NS_IMETHODIMP
nsMemoryReporterManager::RegisterWeakReporter(nsIMemoryReporter* aReporter)
{
return RegisterReporterHelper(aReporter, /* force = */ false,
/* strong = */ false);
}
NS_IMETHODIMP
nsMemoryReporterManager::RegisterStrongReporterEvenIfBlocked(
nsIMemoryReporter* aReporter)
{
return RegisterReporterHelper(aReporter, /* force = */ true,
/* strong = */ true);
}
NS_IMETHODIMP
nsMemoryReporterManager::UnregisterStrongReporter(nsIMemoryReporter* aReporter)
{
// This method is thread-safe.
mozilla::MutexAutoLock autoLock(mMutex);
MOZ_ASSERT(!mWeakReporters->Contains(aReporter));
if (mStrongReporters->Contains(aReporter)) {
mStrongReporters->RemoveEntry(aReporter);
return NS_OK;
}
return NS_ERROR_FAILURE;
}
NS_IMETHODIMP
nsMemoryReporterManager::UnregisterWeakReporter(nsIMemoryReporter* aReporter)
{
// This method is thread-safe.
mozilla::MutexAutoLock autoLock(mMutex);
MOZ_ASSERT(!mStrongReporters->Contains(aReporter));
if (mWeakReporters->Contains(aReporter)) {
mWeakReporters->RemoveEntry(aReporter);
return NS_OK;
}
return NS_ERROR_FAILURE;
}
NS_IMETHODIMP
nsMemoryReporterManager::BlockRegistrationAndHideExistingReporters()
{
// This method is thread-safe.
mozilla::MutexAutoLock autoLock(mMutex);
if (mIsRegistrationBlocked) {
return NS_ERROR_FAILURE;
}
mIsRegistrationBlocked = true;
// Hide the existing reporters, saving them for later restoration.
MOZ_ASSERT(!mSavedStrongReporters);
MOZ_ASSERT(!mSavedWeakReporters);
mSavedStrongReporters = mStrongReporters;
mSavedWeakReporters = mWeakReporters;
mStrongReporters = new StrongReportersTable();
mWeakReporters = new WeakReportersTable();
return NS_OK;
}
NS_IMETHODIMP
nsMemoryReporterManager::UnblockRegistrationAndRestoreOriginalReporters()
{
// This method is thread-safe.
mozilla::MutexAutoLock autoLock(mMutex);
if (!mIsRegistrationBlocked) {
return NS_ERROR_FAILURE;
}
// Banish the current reporters, and restore the hidden ones.
delete mStrongReporters;
delete mWeakReporters;
mStrongReporters = mSavedStrongReporters;
mWeakReporters = mSavedWeakReporters;
mSavedStrongReporters = nullptr;
mSavedWeakReporters = nullptr;
mIsRegistrationBlocked = false;
return NS_OK;
}
// This is just a wrapper for int64_t that implements nsISupports, so it can be
// passed to nsIMemoryReporter::CollectReports.
class Int64Wrapper MOZ_FINAL : public nsISupports
{
~Int64Wrapper() {}
public:
NS_DECL_ISUPPORTS
Int64Wrapper() : mValue(0)
{
}
int64_t mValue;
};
NS_IMPL_ISUPPORTS0(Int64Wrapper)
class ExplicitCallback MOZ_FINAL : public nsIHandleReportCallback
{
~ExplicitCallback() {}
public:
NS_DECL_ISUPPORTS
NS_IMETHOD Callback(const nsACString& aProcess, const nsACString& aPath,
int32_t aKind, int32_t aUnits, int64_t aAmount,
const nsACString& aDescription,
nsISupports* aWrappedExplicit)
{
// Using the "heap-allocated" reporter here instead of
// nsMemoryReporterManager.heapAllocated goes against the usual
// pattern. But it's for a good reason: in tests, we can easily
// create artificial (i.e. deterministic) reporters -- which allows us
// to precisely test nsMemoryReporterManager.explicit -- but we can't
// do that for distinguished amounts.
if (aPath.EqualsLiteral("heap-allocated") ||
(aKind == nsIMemoryReporter::KIND_NONHEAP &&
PromiseFlatCString(aPath).Find("explicit") == 0)) {
Int64Wrapper* wrappedInt64 = static_cast<Int64Wrapper*>(aWrappedExplicit);
wrappedInt64->mValue += aAmount;
}
return NS_OK;
}
};
NS_IMPL_ISUPPORTS(ExplicitCallback, nsIHandleReportCallback)
NS_IMETHODIMP
nsMemoryReporterManager::GetExplicit(int64_t* aAmount)
{
if (NS_WARN_IF(!aAmount)) {
return NS_ERROR_INVALID_ARG;
}
*aAmount = 0;
#ifndef HAVE_JEMALLOC_STATS
return NS_ERROR_NOT_AVAILABLE;
#else
// For each reporter we call CollectReports and filter out the
// non-explicit, non-NONHEAP measurements (except for "heap-allocated").
// That's lots of wasted work, and we used to have a GetExplicitNonHeap()
// method which did this more efficiently, but it ended up being more
// trouble than it was worth.
nsRefPtr<ExplicitCallback> handleReport = new ExplicitCallback();
nsRefPtr<Int64Wrapper> wrappedExplicitSize = new Int64Wrapper();
// Anonymization doesn't matter here, because we're only summing all the
// reported values. Enable it anyway because it's slightly faster, since it
// doesn't have to get URLs, find notable strings, etc.
GetReportsForThisProcess(handleReport, wrappedExplicitSize,
/* anonymize = */ true);
*aAmount = wrappedExplicitSize->mValue;
return NS_OK;
#endif // HAVE_JEMALLOC_STATS
}
NS_IMETHODIMP
nsMemoryReporterManager::GetVsize(int64_t* aVsize)
{
#ifdef HAVE_VSIZE_AND_RESIDENT_REPORTERS
return VsizeDistinguishedAmount(aVsize);
#else
*aVsize = 0;
return NS_ERROR_NOT_AVAILABLE;
#endif
}
NS_IMETHODIMP
nsMemoryReporterManager::GetVsizeMaxContiguous(int64_t* aAmount)
{
#ifdef HAVE_VSIZE_MAX_CONTIGUOUS_REPORTER
return VsizeMaxContiguousDistinguishedAmount(aAmount);
#else
*aAmount = 0;
return NS_ERROR_NOT_AVAILABLE;
#endif
}
NS_IMETHODIMP
nsMemoryReporterManager::GetResident(int64_t* aAmount)
{
#ifdef HAVE_VSIZE_AND_RESIDENT_REPORTERS
return ResidentDistinguishedAmount(aAmount);
#else
*aAmount = 0;
return NS_ERROR_NOT_AVAILABLE;
#endif
}
NS_IMETHODIMP
nsMemoryReporterManager::GetResidentFast(int64_t* aAmount)
{
#ifdef HAVE_VSIZE_AND_RESIDENT_REPORTERS
return ResidentFastDistinguishedAmount(aAmount);
#else
*aAmount = 0;
return NS_ERROR_NOT_AVAILABLE;
#endif
}
/*static*/ int64_t
nsMemoryReporterManager::ResidentFast()
{
#ifdef HAVE_VSIZE_AND_RESIDENT_REPORTERS
int64_t amount;
nsresult rv = ResidentFastDistinguishedAmount(&amount);
NS_ENSURE_SUCCESS(rv, 0);
return amount;
#else
return 0;
#endif
}
NS_IMETHODIMP
nsMemoryReporterManager::GetResidentUnique(int64_t* aAmount)
{
#ifdef HAVE_RESIDENT_UNIQUE_REPORTER
return ResidentUniqueDistinguishedAmount(aAmount);
#else
*aAmount = 0;
return NS_ERROR_NOT_AVAILABLE;
#endif
}
/*static*/ int64_t
nsMemoryReporterManager::ResidentUnique()
{
#ifdef HAVE_RESIDENT_UNIQUE_REPORTER
int64_t amount = 0;
nsresult rv = ResidentUniqueDistinguishedAmount(&amount);
NS_ENSURE_SUCCESS(rv, 0);
return amount;
#else
return 0;
#endif
}
NS_IMETHODIMP
nsMemoryReporterManager::GetHeapAllocated(int64_t* aAmount)
{
#ifdef HAVE_JEMALLOC_STATS
jemalloc_stats_t stats;
jemalloc_stats(&stats);
*aAmount = stats.allocated;
return NS_OK;
#else
*aAmount = 0;
return NS_ERROR_NOT_AVAILABLE;
#endif
}
// This has UNITS_PERCENTAGE, so it is multiplied by 100x.
NS_IMETHODIMP
nsMemoryReporterManager::GetHeapOverheadRatio(int64_t* aAmount)
{
#ifdef HAVE_JEMALLOC_STATS
jemalloc_stats_t stats;
jemalloc_stats(&stats);
*aAmount = HeapOverheadRatio(&stats);
return NS_OK;
#else
*aAmount = 0;
return NS_ERROR_NOT_AVAILABLE;
#endif
}
static nsresult
GetInfallibleAmount(InfallibleAmountFn aAmountFn, int64_t* aAmount)
{
if (aAmountFn) {
*aAmount = aAmountFn();
return NS_OK;
}
*aAmount = 0;
return NS_ERROR_NOT_AVAILABLE;
}
NS_IMETHODIMP
nsMemoryReporterManager::GetJSMainRuntimeGCHeap(int64_t* aAmount)
{
return GetInfallibleAmount(mAmountFns.mJSMainRuntimeGCHeap, aAmount);
}
NS_IMETHODIMP
nsMemoryReporterManager::GetJSMainRuntimeTemporaryPeak(int64_t* aAmount)
{
return GetInfallibleAmount(mAmountFns.mJSMainRuntimeTemporaryPeak, aAmount);
}
NS_IMETHODIMP
nsMemoryReporterManager::GetJSMainRuntimeCompartmentsSystem(int64_t* aAmount)
{
return GetInfallibleAmount(mAmountFns.mJSMainRuntimeCompartmentsSystem,
aAmount);
}
NS_IMETHODIMP
nsMemoryReporterManager::GetJSMainRuntimeCompartmentsUser(int64_t* aAmount)
{
return GetInfallibleAmount(mAmountFns.mJSMainRuntimeCompartmentsUser,
aAmount);
}
NS_IMETHODIMP
nsMemoryReporterManager::GetImagesContentUsedUncompressed(int64_t* aAmount)
{
return GetInfallibleAmount(mAmountFns.mImagesContentUsedUncompressed,
aAmount);
}
NS_IMETHODIMP
nsMemoryReporterManager::GetStorageSQLite(int64_t* aAmount)
{
return GetInfallibleAmount(mAmountFns.mStorageSQLite, aAmount);
}
NS_IMETHODIMP
nsMemoryReporterManager::GetLowMemoryEventsVirtual(int64_t* aAmount)
{
return GetInfallibleAmount(mAmountFns.mLowMemoryEventsVirtual, aAmount);
}
NS_IMETHODIMP
nsMemoryReporterManager::GetLowMemoryEventsPhysical(int64_t* aAmount)
{
return GetInfallibleAmount(mAmountFns.mLowMemoryEventsPhysical, aAmount);
}
NS_IMETHODIMP
nsMemoryReporterManager::GetGhostWindows(int64_t* aAmount)
{
return GetInfallibleAmount(mAmountFns.mGhostWindows, aAmount);
}
NS_IMETHODIMP
nsMemoryReporterManager::GetPageFaultsHard(int64_t* aAmount)
{
#ifdef HAVE_PAGE_FAULT_REPORTERS
return PageFaultsHardDistinguishedAmount(aAmount);
#else
*aAmount = 0;
return NS_ERROR_NOT_AVAILABLE;
#endif
}
NS_IMETHODIMP
nsMemoryReporterManager::GetHasMozMallocUsableSize(bool* aHas)
{
void* p = malloc(16);
if (!p) {
return NS_ERROR_OUT_OF_MEMORY;
}
size_t usable = moz_malloc_usable_size(p);
free(p);
*aHas = !!(usable > 0);
return NS_OK;
}
NS_IMETHODIMP
nsMemoryReporterManager::GetIsDMDEnabled(bool* aIsEnabled)
{
#ifdef MOZ_DMD
*aIsEnabled = true;
#else
*aIsEnabled = false;
#endif
return NS_OK;
}
NS_IMETHODIMP
nsMemoryReporterManager::GetIsDMDRunning(bool* aIsRunning)
{
#ifdef MOZ_DMD
*aIsRunning = dmd::IsRunning();
#else
*aIsRunning = false;
#endif
return NS_OK;
}
namespace {
/**
* This runnable lets us implement
* nsIMemoryReporterManager::MinimizeMemoryUsage(). We fire a heap-minimize
* notification, spin the event loop, and repeat this process a few times.
*
* When this sequence finishes, we invoke the callback function passed to the
* runnable's constructor.
*/
class MinimizeMemoryUsageRunnable : public nsRunnable
{
public:
explicit MinimizeMemoryUsageRunnable(nsIRunnable* aCallback)
: mCallback(aCallback)
, mRemainingIters(sNumIters)
{
}
NS_IMETHOD Run()
{
nsCOMPtr<nsIObserverService> os = services::GetObserverService();
if (!os) {
return NS_ERROR_FAILURE;
}
if (mRemainingIters == 0) {
os->NotifyObservers(nullptr, "after-minimize-memory-usage",
MOZ_UTF16("MinimizeMemoryUsageRunnable"));
if (mCallback) {
mCallback->Run();
}
return NS_OK;
}
os->NotifyObservers(nullptr, "memory-pressure",
MOZ_UTF16("heap-minimize"));
mRemainingIters--;
NS_DispatchToMainThread(this);
return NS_OK;
}
private:
// Send sNumIters heap-minimize notifications, spinning the event
// loop after each notification (see bug 610166 comment 12 for an
// explanation), because one notification doesn't cut it.
static const uint32_t sNumIters = 3;
nsCOMPtr<nsIRunnable> mCallback;
uint32_t mRemainingIters;
};
} // anonymous namespace
NS_IMETHODIMP
nsMemoryReporterManager::MinimizeMemoryUsage(nsIRunnable* aCallback)
{
nsRefPtr<MinimizeMemoryUsageRunnable> runnable =
new MinimizeMemoryUsageRunnable(aCallback);
return NS_DispatchToMainThread(runnable);
}
NS_IMETHODIMP
nsMemoryReporterManager::SizeOfTab(nsIDOMWindow* aTopWindow,
int64_t* aJSObjectsSize,
int64_t* aJSStringsSize,
int64_t* aJSOtherSize,
int64_t* aDomSize,
int64_t* aStyleSize,
int64_t* aOtherSize,
int64_t* aTotalSize,
double* aJSMilliseconds,
double* aNonJSMilliseconds)
{
nsCOMPtr<nsIGlobalObject> global = do_QueryInterface(aTopWindow);
nsCOMPtr<nsPIDOMWindow> piWindow = do_QueryInterface(aTopWindow);
if (NS_WARN_IF(!global) || NS_WARN_IF(!piWindow)) {
return NS_ERROR_FAILURE;
}
TimeStamp t1 = TimeStamp::Now();
// Measure JS memory consumption (and possibly some non-JS consumption, via
// |jsPrivateSize|).
size_t jsObjectsSize, jsStringsSize, jsPrivateSize, jsOtherSize;
nsresult rv = mSizeOfTabFns.mJS(global->GetGlobalJSObject(),
&jsObjectsSize, &jsStringsSize,
&jsPrivateSize, &jsOtherSize);
if (NS_WARN_IF(NS_FAILED(rv))) {
return rv;
}
TimeStamp t2 = TimeStamp::Now();
// Measure non-JS memory consumption.
size_t domSize, styleSize, otherSize;
mSizeOfTabFns.mNonJS(piWindow, &domSize, &styleSize, &otherSize);
TimeStamp t3 = TimeStamp::Now();
*aTotalSize = 0;
#define DO(aN, n) { *aN = (n); *aTotalSize += (n); }
DO(aJSObjectsSize, jsObjectsSize);
DO(aJSStringsSize, jsStringsSize);
DO(aJSOtherSize, jsOtherSize);
DO(aDomSize, jsPrivateSize + domSize);
DO(aStyleSize, styleSize);
DO(aOtherSize, otherSize);
#undef DO
*aJSMilliseconds = (t2 - t1).ToMilliseconds();
*aNonJSMilliseconds = (t3 - t2).ToMilliseconds();
return NS_OK;
}
namespace mozilla {
nsresult
RegisterStrongMemoryReporter(nsIMemoryReporter* aReporter)
{
// Hold a strong reference to the argument to make sure it gets released if
// we return early below.
nsCOMPtr<nsIMemoryReporter> reporter = aReporter;
nsCOMPtr<nsIMemoryReporterManager> mgr =
do_GetService("@mozilla.org/memory-reporter-manager;1");
if (!mgr) {
return NS_ERROR_FAILURE;
}
return mgr->RegisterStrongReporter(reporter);
}
nsresult
RegisterWeakMemoryReporter(nsIMemoryReporter* aReporter)
{
nsCOMPtr<nsIMemoryReporterManager> mgr =
do_GetService("@mozilla.org/memory-reporter-manager;1");
if (!mgr) {
return NS_ERROR_FAILURE;
}
return mgr->RegisterWeakReporter(aReporter);
}
nsresult
UnregisterWeakMemoryReporter(nsIMemoryReporter* aReporter)
{
nsCOMPtr<nsIMemoryReporterManager> mgr =
do_GetService("@mozilla.org/memory-reporter-manager;1");
if (!mgr) {
return NS_ERROR_FAILURE;
}
return mgr->UnregisterWeakReporter(aReporter);
}
#define GET_MEMORY_REPORTER_MANAGER(mgr) \
nsRefPtr<nsMemoryReporterManager> mgr = \
nsMemoryReporterManager::GetOrCreate(); \
if (!mgr) { \
return NS_ERROR_FAILURE; \
}
// Macro for generating functions that register distinguished amount functions
// with the memory reporter manager.
#define DEFINE_REGISTER_DISTINGUISHED_AMOUNT(kind, name) \
nsresult \
Register##name##DistinguishedAmount(kind##AmountFn aAmountFn) \
{ \
GET_MEMORY_REPORTER_MANAGER(mgr) \
mgr->mAmountFns.m##name = aAmountFn; \
return NS_OK; \
}
#define DEFINE_UNREGISTER_DISTINGUISHED_AMOUNT(name) \
nsresult \
Unregister##name##DistinguishedAmount() \
{ \
GET_MEMORY_REPORTER_MANAGER(mgr) \
mgr->mAmountFns.m##name = nullptr; \
return NS_OK; \
}
DEFINE_REGISTER_DISTINGUISHED_AMOUNT(Infallible, JSMainRuntimeGCHeap)
DEFINE_REGISTER_DISTINGUISHED_AMOUNT(Infallible, JSMainRuntimeTemporaryPeak)
DEFINE_REGISTER_DISTINGUISHED_AMOUNT(Infallible, JSMainRuntimeCompartmentsSystem)
DEFINE_REGISTER_DISTINGUISHED_AMOUNT(Infallible, JSMainRuntimeCompartmentsUser)
DEFINE_REGISTER_DISTINGUISHED_AMOUNT(Infallible, ImagesContentUsedUncompressed)
DEFINE_REGISTER_DISTINGUISHED_AMOUNT(Infallible, StorageSQLite)
DEFINE_UNREGISTER_DISTINGUISHED_AMOUNT(StorageSQLite)
DEFINE_REGISTER_DISTINGUISHED_AMOUNT(Infallible, LowMemoryEventsVirtual)
DEFINE_REGISTER_DISTINGUISHED_AMOUNT(Infallible, LowMemoryEventsPhysical)
DEFINE_REGISTER_DISTINGUISHED_AMOUNT(Infallible, GhostWindows)
#undef DEFINE_REGISTER_DISTINGUISHED_AMOUNT
#undef DEFINE_UNREGISTER_DISTINGUISHED_AMOUNT
#define DEFINE_REGISTER_SIZE_OF_TAB(name) \
nsresult \
Register##name##SizeOfTab(name##SizeOfTabFn aSizeOfTabFn) \
{ \
GET_MEMORY_REPORTER_MANAGER(mgr) \
mgr->mSizeOfTabFns.m##name = aSizeOfTabFn; \
return NS_OK; \
}
DEFINE_REGISTER_SIZE_OF_TAB(JS);
DEFINE_REGISTER_SIZE_OF_TAB(NonJS);
#undef DEFINE_REGISTER_SIZE_OF_TAB
#undef GET_MEMORY_REPORTER_MANAGER
}
#if defined(MOZ_DMD)
namespace mozilla {
namespace dmd {
class DoNothingCallback MOZ_FINAL : public nsIHandleReportCallback
{
public:
NS_DECL_ISUPPORTS
NS_IMETHOD Callback(const nsACString& aProcess, const nsACString& aPath,
int32_t aKind, int32_t aUnits, int64_t aAmount,
const nsACString& aDescription,
nsISupports* aData)
{
// Do nothing; the reporter has already reported to DMD.
return NS_OK;
}
private:
~DoNothingCallback() {}
};
NS_IMPL_ISUPPORTS(DoNothingCallback, nsIHandleReportCallback)
void
RunReportersForThisProcess()
{
nsCOMPtr<nsIMemoryReporterManager> mgr =
do_GetService("@mozilla.org/memory-reporter-manager;1");
nsRefPtr<DoNothingCallback> doNothing = new DoNothingCallback();
mgr->GetReportsForThisProcess(doNothing, nullptr, /* anonymize = */ false);
}
} // namespace dmd
} // namespace mozilla
#endif // defined(MOZ_DMD)
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