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Minimal test - lines (209, 216)

Code

[[nodiscard]] static nsresult VsizeDistinguishedAmount(int64_t* aN) {
  KINFO_PROC proc;
  nsresult rv = GetKinfoProcSelf(&proc);
  if (NS_SUCCEEDED(rv)) {
    *aN = KP_SIZE(proc);
  }
  return rv;
}

Minimal test - lines (265, 271)

Code

[[nodiscard]] 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;
}

Minimal test - lines (218, 225)

Code

[[nodiscard]] static nsresult ResidentDistinguishedAmount(int64_t* aN) {
  KINFO_PROC proc;
  nsresult rv = GetKinfoProcSelf(&proc);
  if (NS_SUCCEEDED(rv)) {
    *aN = KP_RSS(proc);
  }
  return rv;
}

Minimal test - lines (358, 360)

Code

[[nodiscard]] static nsresult ResidentFastDistinguishedAmount(int64_t* aN) {
  return ResidentDistinguishedAmount(aN);
}

Minimal test - lines (348, 356)

Code

[[nodiscard]] static nsresult ResidentDistinguishedAmount(int64_t* aN) {
  int64_t vsize, resident, shared;
  XMappingIter(vsize, resident, shared);
  if (resident == -1) {
    return NS_ERROR_FAILURE;
  }
  *aN = resident;
  return NS_OK;
}

Minimal test - lines (130, 145)

Code

[[nodiscard]] static nsresult SystemHeapSize(int64_t* aSizeOut) {
  struct mallinfo info = mallinfo();

  // The documentation in the glibc man page makes it sound like |uordblks|
  // would suffice, but that only gets the small allocations that are put in
  // the brk heap. We need |hblkhd| as well to get the larger allocations
  // that are mmapped.
  //
  // The fields in |struct mallinfo| are all |int|, , so it is
  // unreliable if memory usage gets high. However, the system heap size on
  // Linux should usually be zero (so long as jemalloc is enabled) so that
  // shouldn't be a problem. Nonetheless, cast the |int|s to |size_t| before
  // adding them to provide a small amount of extra overflow protection.
  *aSizeOut = size_t(info.hblkhd) + size_t(info.uordblks);
  return NS_OK;
}

Minimal test - lines (274, 282)

Code

[[nodiscard]] static nsresult VsizeMaxContiguousDistinguishedAmount(
    int64_t* aN) {
  uint64_t biggestRegion;
  nsresult rv = GetKinfoVmentrySelf(nullptr, &biggestRegion);
  if (NS_SUCCEEDED(rv)) {
    *aN = biggestRegion;
  }
  return NS_OK;
}

Minimal test - lines (363, 371)

Code

[[nodiscard]] static nsresult ResidentUniqueDistinguishedAmount(int64_t* aN) {
  int64_t vsize, resident, shared;
  XMappingIter(vsize, resident, shared);
  if (resident == -1) {
    return NS_ERROR_FAILURE;
  }
  *aN = resident - shared;
  return NS_OK;
}

Minimal test - lines (183, 206)

Code

[[nodiscard]] static nsresult GetKinfoProcSelf(KINFO_PROC* aProc) {
#  if defined(__OpenBSD__) && defined(MOZ_SANDBOX)
  static LazyLogModule sPledgeLog("SandboxPledge");
  MOZ_LOG(sPledgeLog, LogLevel::Debug,
          ("%s called when pledged, returning NS_ERROR_FAILURE\n", __func__));
  return NS_ERROR_FAILURE;
#  endif
  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;
}

Minimal test - lines (123, 126)

Code

[[nodiscard]] static nsresult ResidentUniqueDistinguishedAmount(
    int64_t* aN, pid_t aPid = 0) {
  return GetProcSelfSmapsPrivate(aN, aPid);
}

Minimal test - lines (118, 120)

Code

[[nodiscard]] static nsresult ResidentFastDistinguishedAmount(int64_t* aN) {
  return ResidentDistinguishedAmount(aN);
}

Minimal test - lines (110, 112)

Code

[[nodiscard]] static nsresult VsizeDistinguishedAmount(int64_t* aN) {
  return GetProcSelfStatmField(0, aN);
}

Minimal test - lines (291, 335)

Code

static void XMappingIter(int64_t& aVsize, int64_t& aResident,
                         int64_t& aShared) {
  aVsize = -1;
  aResident = -1;
  aShared = -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//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;
          aShared = 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;
            if (prmapp[i].pr_mflags & MA_SHARED) {
              aShared += prmapp[i].pr_rss * prmapp[i].pr_pagesize;
            }
          }
          break;
        }
        free(prmapp);
      }
      free(prmapp);
    }
    close(mapfd);
  }
}

Minimal test - lines (235, 262)

Code

[[nodiscard]] 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;
}

Minimal test - lines (227, 229)

Code

[[nodiscard]] static nsresult ResidentFastDistinguishedAmount(int64_t* aN) {
  return ResidentDistinguishedAmount(aN);
}

Minimal test - lines (72, 88)

Code

[[nodiscard]] 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;
}

Minimal test - lines (90, 107)

Code

[[nodiscard]] static nsresult GetProcSelfSmapsPrivate(int64_t* aN, pid_t aPid) {
  // You might be tempted to calculate USS by subtracting the "shared" value
  // from the "resident" value in /proc//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.

  nsTArray mappings(1024);
  MOZ_TRY(GetMemoryMappings(mappings, aPid));

  int64_t amount = 0;
  for (auto& mapping : mappings) {
    amount += mapping.Private_Clean();
    amount += mapping.Private_Dirty();
  }
  *aN = amount;
  return NS_OK;
}

Minimal test - lines (338, 346)

Code

[[nodiscard]] static nsresult VsizeDistinguishedAmount(int64_t* aN) {
  int64_t vsize, resident, shared;
  XMappingIter(vsize, resident, shared);
  if (vsize == -1) {
    return NS_ERROR_FAILURE;
  }
  *aN = vsize;
  return NS_OK;
}

Minimal test - lines (114, 116)

Code

[[nodiscard]] static nsresult ResidentDistinguishedAmount(int64_t* aN) {
  return GetProcSelfStatmField(1, aN);
}