Fix CPU share calculation (#5324)

.gitignore

@@ -48,6 +48,9 @@ bld/
 *.VisualState.xml
 TestResult.xml
 
+# VERIFY
+*.received.*
+
 # Build Results of an ATL Project
 [Dd]ebugPS/
 [Rr]eleasePS/

eng/packages/TestOnly.props

@@ -5,15 +5,16 @@
     <PackageVersion Include="autofixture" Version="4.17.0" />
     <PackageVersion Include="BenchmarkDotNet" Version="0.13.5" />
     <PackageVersion Include="FluentAssertions" Version="6.11.0" />
+    <PackageVersion Include="Grpc.AspNetCore" Version="2.57.0" />
     <PackageVersion Include="Microsoft.Diagnostics.Tracing.TraceEvent" Version="3.1.3" />
     <PackageVersion Include="Moq.AutoMock" Version="3.1.0" />
     <PackageVersion Include="Moq" Version="4.18.4" />
     <PackageVersion Include="Polly.Testing" Version="8.4.1" />
     <PackageVersion Include="StrongNamer" Version="0.2.5" />
     <PackageVersion Include="System.Configuration.ConfigurationManager" Version="$(SystemConfigurationConfigurationManagerVersion)" />
-    <PackageVersion Include="Xunit.Combinatorial" Version="1.5.25" />
+    <PackageVersion Include="Verify.Xunit" Version="20.4.0" />
+    <PackageVersion Include="Xunit.Combinatorial" Version="1.6.24" />
     <PackageVersion Include="xunit.extensibility.execution" Version="2.4.2" />
-    <PackageVersion Include="Grpc.AspNetCore" Version="2.57.0" />
   </ItemGroup>
 
   <ItemGroup Condition="'$(TargetFramework)' == 'net462'">

src/Libraries/Microsoft.Extensions.Diagnostics.ResourceMonitoring/Linux/LinuxUtilizationParserCgroupV2.cs

@@ -261,7 +261,7 @@ public long GetMemoryUsageInBytesFromSlices(string pattern)
             {
                 memoryUsageInBytesTotal = 0;
                 Throw.InvalidOperationException(
-                    $"We tried to read '{memoryUsageInBytesFile}', and we expected to get a positive number but instead it was: '{containerMemoryUsage}'.");
+                    $"We tried to read '{memoryUsageInBytesFile}', and we expected to get a positive number but instead it was: '{memoryUsageFile}'.");
             }
 
             memoryUsageInBytesTotal += containerMemoryUsage;
@@ -533,6 +533,9 @@ private static bool TryGetCpuUnitsFromCgroups(IFileSystem fileSystem, out float
 
     private static bool TryGetCgroupRequestCpu(IFileSystem fileSystem, out float cpuUnits)
     {
+        const long CpuPodWeightPossibleMax = 10_000;
+        const long CpuPodWeightPossibleMin = 1;
+
         if (!fileSystem.Exists(_cpuPodWeight))
         {
             cpuUnits = 0;
@@ -545,26 +548,33 @@ private static bool TryGetCgroupRequestCpu(IFileSystem fileSystem, out float cpu
 
         if (cpuPodWeightBuffer.IsEmpty || (cpuPodWeightBuffer.Length == 2 && cpuPodWeightBuffer[0] == '-' && cpuPodWeightBuffer[1] == '1'))
         {
-            Throw.InvalidOperationException($"Could not parse '{_cpuPodWeight}' content. Expected to find CPU weight but got '{new string(cpuPodWeightBuffer)}' instead.");
+            Throw.InvalidOperationException(
+                $"Could not parse '{_cpuPodWeight}' content. Expected to find CPU weight but got '{new string(cpuPodWeightBuffer)}' instead.");
         }
 
         _ = GetNextNumber(cpuPodWeightBuffer, out long cpuPodWeight);
 
         if (cpuPodWeight == -1)
         {
-            Throw.InvalidOperationException($"Could not parse '{_cpuPodWeight}'. Expected to get an integer but got: '{cpuPodWeight}'.");
+            Throw.InvalidOperationException(
+                $"Could not parse '{_cpuPodWeight}' content. Expected to get an integer but got: '{cpuPodWeightBuffer}'.");
         }
 
-        // Calculate CPU pod request in millicores based on the weight, using the formula:
-        // y = (1 + ((x - 2) * 9999) / 262142), where y is the CPU weight and x is the CPU share (cgroup v1)
-        // https://github.com/kubernetes/enhancements/tree/master/keps/sig-node/2254-cgroup-v2#phase-1-convert-from-cgroups-v1-settings-to-v2
-        long cpuPodShare = ((cpuPodWeight * 262142) + 19997) / 9999;
-        if (cpuPodShare == -1)
+        if (cpuPodWeight < CpuPodWeightPossibleMin || cpuPodWeight > CpuPodWeightPossibleMax)
         {
-            Throw.InvalidOperationException($"Could not calculate CPU share from CPU weight '{cpuPodShare}'");
+            Throw.ArgumentOutOfRangeException("CPU weight",
+                $"Expected to find CPU weight in range [{CpuPodWeightPossibleMin}-{CpuPodWeightPossibleMax}] in '{_cpuPodWeight}', but got '{cpuPodWeight}' instead.");
         }
 
-        cpuUnits = cpuPodShare;
+        // The formula to calculate CPU pod weight (measured in millicores) from CPU share:
+        // y = (1 + ((x - 2) * 9999) / 262142),
+        // where y is the CPU pod weight (e.g. cpuPodWeight) and x is the CPU share of cgroup v1 (e.g. cpuUnits).
+        // https://github.com/kubernetes/enhancements/tree/master/keps/sig-node/2254-cgroup-v2#phase-1-convert-from-cgroups-v1-settings-to-v2
+        // We invert the formula to calculate CPU share from CPU pod weight:
+#pragma warning disable S109 // Magic numbers should not be used - using the formula, forgive.
+        cpuUnits = ((cpuPodWeight - 1) * 262142 / 9999) + 2;
+#pragma warning restore S109 // Magic numbers should not be used
+
         return true;
     }
 
@@ -580,7 +590,7 @@ private long GetMemoryUsageInBytesPod()
         if (memoryUsage == -1)
         {
             Throw.InvalidOperationException(
-                $"We tried to read '{_memoryUsageInBytes}', and we expected to get a positive number but instead it was: '{memoryUsage}'.");
+                $"We tried to read '{_memoryUsageInBytes}', and we expected to get a positive number but instead it was: '{memoryUsageFile}'.");
         }
 
         return memoryUsage;

src/Libraries/Microsoft.Extensions.Diagnostics.ResourceMonitoring/README.md

@@ -1,6 +1,6 @@
 # Microsoft.Extensions.Diagnostics.ResourceMonitoring
 
-Measures and reports processor and memory usage. This library utilizes control groups (cgroups) including cgroups v2 in Linux to monitor system resources.
+Measures and reports processor and memory usage. This library utilizes control groups (cgroups) in Linux to monitor system resources. Both cgroups v1 and v2 are supported.
 
 ## Install the package
 

test/Directory.Build.targets

@@ -8,6 +8,7 @@
     <PackageReference Include="Moq.AutoMock" />
     <PackageReference Include="Moq" />
     <PackageReference Include="StrongNamer" Condition="'$(SignArtifacts)' == 'true' " />
+    <PackageReference Include="Verify.Xunit" />
     <PackageReference Include="Xunit.Combinatorial" />
 
     <Content Include="$(MSBuildThisFileDirectory)\..\eng\xunit.runner.json" CopyToOutputDirectory="PreserveNewest" Visible="false" />

test/Libraries/Microsoft.Extensions.Diagnostics.ResourceMonitoring.Tests/Linux/LinuxUtilizationParserCgroupV2Tests.Fallsback_To_Cpuset_When_Quota_And_Period_Are_Minus_One_.verified.txt

@@ -0,0 +1,11 @@
+{
+  Type: InvalidOperationException,
+  Message: Could not parse '/sys/fs/cgroup/cpuset.cpus.effective'. Expected comma-separated list of integers, with dashes ("-") based ranges ("0", "2-6,12") but got '@'.,
+  StackTrace:
+at Microsoft.Shared.Diagnostics.Throw.InvalidOperationException(String message)
+at Microsoft.Extensions.Diagnostics.ResourceMonitoring.Linux.LinuxUtilizationParserCgroupV2.<GetHostCpuCount>g__ThrowException|23_0(ReadOnlySpan`1 content)
+at Microsoft.Extensions.Diagnostics.ResourceMonitoring.Linux.LinuxUtilizationParserCgroupV2.GetHostCpuCount()
+at Microsoft.Extensions.Diagnostics.ResourceMonitoring.Linux.LinuxUtilizationParserCgroupV2.GetCgroupLimitedCpus()
+at Microsoft.Extensions.Diagnostics.ResourceMonitoring.Linux.Test.LinuxUtilizationParserCgroupV2Tests.<>c__DisplayClass15_0.<Fallsback_To_Cpuset_When_Quota_And_Period_Are_Minus_One_>b__0()
+at Xunit.Record.Exception(Func`1 testCode)
+}

test/Libraries/Microsoft.Extensions.Diagnostics.ResourceMonitoring.Tests/Linux/LinuxUtilizationParserCgroupV2Tests.Throws_When_AvailableMemoryInBytes_Doesnt_Contain_Just_A_Number_content=Suspicious12312312.verified.txt

@@ -0,0 +1,9 @@
+{
+  Type: InvalidOperationException,
+  Message: Could not parse '/sys/fs/cgroup/memory.max' content. Expected to find available memory in bytes but got 'Suspicious12312312' instead.,
+  StackTrace:
+at Microsoft.Shared.Diagnostics.Throw.InvalidOperationException(String message)
+at Microsoft.Extensions.Diagnostics.ResourceMonitoring.Linux.LinuxUtilizationParserCgroupV2.GetAvailableMemoryInBytes()
+at Microsoft.Extensions.Diagnostics.ResourceMonitoring.Linux.Test.LinuxUtilizationParserCgroupV2Tests.<>c__DisplayClass6_0.<Throws_When_AvailableMemoryInBytes_Doesnt_Contain_Just_A_Number>b__0()
+at Xunit.Record.Exception(Func`1 testCode)
+}

test/Libraries/Microsoft.Extensions.Diagnostics.ResourceMonitoring.Tests/Linux/LinuxUtilizationParserCgroupV2Tests.Throws_When_AvailableMemoryInBytes_Doesnt_Contain_Just_A_Number_content=string12312.verified.txt

@@ -0,0 +1,9 @@
+{
+  Type: InvalidOperationException,
+  Message: Could not parse '/sys/fs/cgroup/memory.max' content. Expected to find available memory in bytes but got 'string12312' instead.,
+  StackTrace:
+at Microsoft.Shared.Diagnostics.Throw.InvalidOperationException(String message)
+at Microsoft.Extensions.Diagnostics.ResourceMonitoring.Linux.LinuxUtilizationParserCgroupV2.GetAvailableMemoryInBytes()
+at Microsoft.Extensions.Diagnostics.ResourceMonitoring.Linux.Test.LinuxUtilizationParserCgroupV2Tests.<>c__DisplayClass6_0.<Throws_When_AvailableMemoryInBytes_Doesnt_Contain_Just_A_Number>b__0()
+at Xunit.Record.Exception(Func`1 testCode)
+}

test/Libraries/Microsoft.Extensions.Diagnostics.ResourceMonitoring.Tests/Linux/LinuxUtilizationParserCgroupV2Tests.Throws_When_AvailableMemoryInBytes_Doesnt_Contain_Just_A_Number_content=string@.verified.txt

@@ -0,0 +1,9 @@
+{
+  Type: InvalidOperationException,
+  Message: Could not parse '/sys/fs/cgroup/memory.max' content. Expected to find available memory in bytes but got 'string@' instead.,
+  StackTrace:
+at Microsoft.Shared.Diagnostics.Throw.InvalidOperationException(String message)
+at Microsoft.Extensions.Diagnostics.ResourceMonitoring.Linux.LinuxUtilizationParserCgroupV2.GetAvailableMemoryInBytes()
+at Microsoft.Extensions.Diagnostics.ResourceMonitoring.Linux.Test.LinuxUtilizationParserCgroupV2Tests.<>c__DisplayClass6_0.<Throws_When_AvailableMemoryInBytes_Doesnt_Contain_Just_A_Number>b__0()
+at Xunit.Record.Exception(Func`1 testCode)
+}

test/Libraries/Microsoft.Extensions.Diagnostics.ResourceMonitoring.Tests/Linux/LinuxUtilizationParserCgroupV2Tests.Throws_When_Cgroup_Cpu_Files_Contain_Invalid_Data_quota= 12_period=eeeee 12.verified.txt

@@ -0,0 +1,10 @@
+{
+  Type: InvalidOperationException,
+  Message: Could not parse '/sys/fs/cgroup/cpu.max'. Expected to get an integer but got: ' eeeee 12'.,
+  StackTrace:
+at Microsoft.Shared.Diagnostics.Throw.InvalidOperationException(String message)
+at Microsoft.Extensions.Diagnostics.ResourceMonitoring.Linux.LinuxUtilizationParserCgroupV2.TryGetCpuUnitsFromCgroups(IFileSystem fileSystem, Single& cpuUnits)
+at Microsoft.Extensions.Diagnostics.ResourceMonitoring.Linux.LinuxUtilizationParserCgroupV2.GetCgroupLimitedCpus()
+at Microsoft.Extensions.Diagnostics.ResourceMonitoring.Linux.Test.LinuxUtilizationParserCgroupV2Tests.<>c__DisplayClass16_0.<Throws_When_Cgroup_Cpu_Files_Contain_Invalid_Data>b__0()
+at Xunit.Record.Exception(Func`1 testCode)
+}

test/Libraries/Microsoft.Extensions.Diagnostics.ResourceMonitoring.Tests/Linux/LinuxUtilizationParserCgroupV2Tests.Throws_When_Cgroup_Cpu_Files_Contain_Invalid_Data_quota=-----_period=18.verified.txt

@@ -0,0 +1,10 @@
+{
+  Type: InvalidOperationException,
+  Message: Could not parse '/sys/fs/cgroup/cpu.max'. Expected to get an integer but got: ''.,
+  StackTrace:
+at Microsoft.Shared.Diagnostics.Throw.InvalidOperationException(String message)
+at Microsoft.Extensions.Diagnostics.ResourceMonitoring.Linux.LinuxUtilizationParserCgroupV2.TryGetCpuUnitsFromCgroups(IFileSystem fileSystem, Single& cpuUnits)
+at Microsoft.Extensions.Diagnostics.ResourceMonitoring.Linux.LinuxUtilizationParserCgroupV2.GetCgroupLimitedCpus()
+at Microsoft.Extensions.Diagnostics.ResourceMonitoring.Linux.Test.LinuxUtilizationParserCgroupV2Tests.<>c__DisplayClass16_0.<Throws_When_Cgroup_Cpu_Files_Contain_Invalid_Data>b__0()
+at Xunit.Record.Exception(Func`1 testCode)
+}

test/Libraries/Microsoft.Extensions.Diagnostics.ResourceMonitoring.Tests/Linux/LinuxUtilizationParserCgroupV2Tests.Throws_When_Cgroup_Cpu_Files_Contain_Invalid_Data_quota=-18_period=18.verified.txt

@@ -0,0 +1,10 @@
+{
+  Type: InvalidOperationException,
+  Message: Could not parse '/sys/fs/cgroup/cpu.max'. Expected an integer but got: '-18 18'.,
+  StackTrace:
+at Microsoft.Shared.Diagnostics.Throw.InvalidOperationException(String message)
+at Microsoft.Extensions.Diagnostics.ResourceMonitoring.Linux.LinuxUtilizationParserCgroupV2.TryGetCpuUnitsFromCgroups(IFileSystem fileSystem, Single& cpuUnits)
+at Microsoft.Extensions.Diagnostics.ResourceMonitoring.Linux.LinuxUtilizationParserCgroupV2.GetCgroupLimitedCpus()
+at Microsoft.Extensions.Diagnostics.ResourceMonitoring.Linux.Test.LinuxUtilizationParserCgroupV2Tests.<>c__DisplayClass16_0.<Throws_When_Cgroup_Cpu_Files_Contain_Invalid_Data>b__0()
+at Xunit.Record.Exception(Func`1 testCode)
+}

test/Libraries/Microsoft.Extensions.Diagnostics.ResourceMonitoring.Tests/Linux/LinuxUtilizationParserCgroupV2Tests.Throws_When_Cgroup_Cpu_Files_Contain_Invalid_Data_quota=-_period=d'.verified.txt

@@ -0,0 +1,10 @@
+{
+  Type: InvalidOperationException,
+  Message: Could not parse '/sys/fs/cgroup/cpu.max'. Expected an integer but got: '- d''.,
+  StackTrace:
+at Microsoft.Shared.Diagnostics.Throw.InvalidOperationException(String message)
+at Microsoft.Extensions.Diagnostics.ResourceMonitoring.Linux.LinuxUtilizationParserCgroupV2.TryGetCpuUnitsFromCgroups(IFileSystem fileSystem, Single& cpuUnits)
+at Microsoft.Extensions.Diagnostics.ResourceMonitoring.Linux.LinuxUtilizationParserCgroupV2.GetCgroupLimitedCpus()
+at Microsoft.Extensions.Diagnostics.ResourceMonitoring.Linux.Test.LinuxUtilizationParserCgroupV2Tests.<>c__DisplayClass16_0.<Throws_When_Cgroup_Cpu_Files_Contain_Invalid_Data>b__0()
+at Xunit.Record.Exception(Func`1 testCode)
+}

test/Libraries/Microsoft.Extensions.Diagnostics.ResourceMonitoring.Tests/Linux/LinuxUtilizationParserCgroupV2Tests.Throws_When_Cgroup_Cpu_Files_Contain_Invalid_Data_quota=-_period=d--.verified.txt

@@ -0,0 +1,10 @@
+{
+  Type: InvalidOperationException,
+  Message: Could not parse '/sys/fs/cgroup/cpu.max'. Expected an integer but got: '- d/:'.,
+  StackTrace:
+at Microsoft.Shared.Diagnostics.Throw.InvalidOperationException(String message)
+at Microsoft.Extensions.Diagnostics.ResourceMonitoring.Linux.LinuxUtilizationParserCgroupV2.TryGetCpuUnitsFromCgroups(IFileSystem fileSystem, Single& cpuUnits)
+at Microsoft.Extensions.Diagnostics.ResourceMonitoring.Linux.LinuxUtilizationParserCgroupV2.GetCgroupLimitedCpus()
+at Microsoft.Extensions.Diagnostics.ResourceMonitoring.Linux.Test.LinuxUtilizationParserCgroupV2Tests.<>c__DisplayClass16_0.<Throws_When_Cgroup_Cpu_Files_Contain_Invalid_Data>b__0()
+at Xunit.Record.Exception(Func`1 testCode)
+}

test/Libraries/Microsoft.Extensions.Diagnostics.ResourceMonitoring.Tests/Linux/LinuxUtilizationParserCgroupV2Tests.Throws_When_Cgroup_Cpu_Files_Contain_Invalid_Data_quota=12 _period=.verified.txt

@@ -0,0 +1,10 @@
+{
+  Type: InvalidOperationException,
+  Message: Could not parse '/sys/fs/cgroup/cpu.max'. Expected to get an integer but got: '        '.,
+  StackTrace:
+at Microsoft.Shared.Diagnostics.Throw.InvalidOperationException(String message)
+at Microsoft.Extensions.Diagnostics.ResourceMonitoring.Linux.LinuxUtilizationParserCgroupV2.TryGetCpuUnitsFromCgroups(IFileSystem fileSystem, Single& cpuUnits)
+at Microsoft.Extensions.Diagnostics.ResourceMonitoring.Linux.LinuxUtilizationParserCgroupV2.GetCgroupLimitedCpus()
+at Microsoft.Extensions.Diagnostics.ResourceMonitoring.Linux.Test.LinuxUtilizationParserCgroupV2Tests.<>c__DisplayClass16_0.<Throws_When_Cgroup_Cpu_Files_Contain_Invalid_Data>b__0()
+at Xunit.Record.Exception(Func`1 testCode)
+}

test/Libraries/Microsoft.Extensions.Diagnostics.ResourceMonitoring.Tests/Linux/LinuxUtilizationParserCgroupV2Tests.Throws_When_Cgroup_Cpu_Files_Contain_Invalid_Data_quota=123_period=-----.verified.txt

@@ -0,0 +1,16 @@
+{
+  Type: InvalidOperationException,
+  Message:
+Could not parse '/sys/fs/cgroup/cpu.max'. Expected to get an integer but got: ' 
+
+
+
+
+'.,
+  StackTrace:
+at Microsoft.Shared.Diagnostics.Throw.InvalidOperationException(String message)
+at Microsoft.Extensions.Diagnostics.ResourceMonitoring.Linux.LinuxUtilizationParserCgroupV2.TryGetCpuUnitsFromCgroups(IFileSystem fileSystem, Single& cpuUnits)
+at Microsoft.Extensions.Diagnostics.ResourceMonitoring.Linux.LinuxUtilizationParserCgroupV2.GetCgroupLimitedCpus()
+at Microsoft.Extensions.Diagnostics.ResourceMonitoring.Linux.Test.LinuxUtilizationParserCgroupV2Tests.<>c__DisplayClass16_0.<Throws_When_Cgroup_Cpu_Files_Contain_Invalid_Data>b__0()
+at Xunit.Record.Exception(Func`1 testCode)
+}

test/Libraries/Microsoft.Extensions.Diagnostics.ResourceMonitoring.Tests/Linux/LinuxUtilizationParserCgroupV2Tests.Throws_When_Cgroup_Cpu_Files_Contain_Invalid_Data_quota=2_period=d--.verified.txt

@@ -0,0 +1,10 @@
+{
+  Type: InvalidOperationException,
+  Message: Could not parse '/sys/fs/cgroup/cpu.max'. Expected to get an integer but got: ' d/:'.,
+  StackTrace:
+at Microsoft.Shared.Diagnostics.Throw.InvalidOperationException(String message)
+at Microsoft.Extensions.Diagnostics.ResourceMonitoring.Linux.LinuxUtilizationParserCgroupV2.TryGetCpuUnitsFromCgroups(IFileSystem fileSystem, Single& cpuUnits)
+at Microsoft.Extensions.Diagnostics.ResourceMonitoring.Linux.LinuxUtilizationParserCgroupV2.GetCgroupLimitedCpus()
+at Microsoft.Extensions.Diagnostics.ResourceMonitoring.Linux.Test.LinuxUtilizationParserCgroupV2Tests.<>c__DisplayClass16_0.<Throws_When_Cgroup_Cpu_Files_Contain_Invalid_Data>b__0()
+at Xunit.Record.Exception(Func`1 testCode)
+}

test/Libraries/Microsoft.Extensions.Diagnostics.ResourceMonitoring.Tests/Linux/LinuxUtilizationParserCgroupV2Tests.Throws_When_Cgroup_Cpu_Files_Contain_Invalid_Data_quota=2d2d2d_period=e3.verified.txt

@@ -0,0 +1,10 @@
+{
+  Type: InvalidOperationException,
+  Message: Could not parse '/sys/fs/cgroup/cpu.max'. Expected to get an integer but got: 'd2d2d e3'.,
+  StackTrace:
+at Microsoft.Shared.Diagnostics.Throw.InvalidOperationException(String message)
+at Microsoft.Extensions.Diagnostics.ResourceMonitoring.Linux.LinuxUtilizationParserCgroupV2.TryGetCpuUnitsFromCgroups(IFileSystem fileSystem, Single& cpuUnits)
+at Microsoft.Extensions.Diagnostics.ResourceMonitoring.Linux.LinuxUtilizationParserCgroupV2.GetCgroupLimitedCpus()
+at Microsoft.Extensions.Diagnostics.ResourceMonitoring.Linux.Test.LinuxUtilizationParserCgroupV2Tests.<>c__DisplayClass16_0.<Throws_When_Cgroup_Cpu_Files_Contain_Invalid_Data>b__0()
+at Xunit.Record.Exception(Func`1 testCode)
+}

test/Libraries/Microsoft.Extensions.Diagnostics.ResourceMonitoring.Tests/Linux/LinuxUtilizationParserCgroupV2Tests.Throws_When_Cgroup_Cpu_Files_Contain_Invalid_Data_quota=3d_period=d3.verified.txt

@@ -0,0 +1,10 @@
+{
+  Type: InvalidOperationException,
+  Message: Could not parse '/sys/fs/cgroup/cpu.max'. Expected to get an integer but got: 'd d3'.,
+  StackTrace:
+at Microsoft.Shared.Diagnostics.Throw.InvalidOperationException(String message)
+at Microsoft.Extensions.Diagnostics.ResourceMonitoring.Linux.LinuxUtilizationParserCgroupV2.TryGetCpuUnitsFromCgroups(IFileSystem fileSystem, Single& cpuUnits)
+at Microsoft.Extensions.Diagnostics.ResourceMonitoring.Linux.LinuxUtilizationParserCgroupV2.GetCgroupLimitedCpus()
+at Microsoft.Extensions.Diagnostics.ResourceMonitoring.Linux.Test.LinuxUtilizationParserCgroupV2Tests.<>c__DisplayClass16_0.<Throws_When_Cgroup_Cpu_Files_Contain_Invalid_Data>b__0()
+at Xunit.Record.Exception(Func`1 testCode)
+}

test/Libraries/Microsoft.Extensions.Diagnostics.ResourceMonitoring.Tests/Linux/LinuxUtilizationParserCgroupV2Tests.Throws_When_Cgroup_Cpu_Files_Contain_Invalid_Data_quota=dd1d_period=18.verified.txt

@@ -0,0 +1,10 @@
+{
+  Type: InvalidOperationException,
+  Message: Could not parse '/sys/fs/cgroup/cpu.max'. Expected an integer but got: 'dd1d 18'.,
+  StackTrace:
+at Microsoft.Shared.Diagnostics.Throw.InvalidOperationException(String message)
+at Microsoft.Extensions.Diagnostics.ResourceMonitoring.Linux.LinuxUtilizationParserCgroupV2.TryGetCpuUnitsFromCgroups(IFileSystem fileSystem, Single& cpuUnits)
+at Microsoft.Extensions.Diagnostics.ResourceMonitoring.Linux.LinuxUtilizationParserCgroupV2.GetCgroupLimitedCpus()
+at Microsoft.Extensions.Diagnostics.ResourceMonitoring.Linux.Test.LinuxUtilizationParserCgroupV2Tests.<>c__DisplayClass16_0.<Throws_When_Cgroup_Cpu_Files_Contain_Invalid_Data>b__0()
+at Xunit.Record.Exception(Func`1 testCode)
+}

test/Libraries/Microsoft.Extensions.Diagnostics.ResourceMonitoring.Tests/Linux/LinuxUtilizationParserCgroupV2Tests.Throws_When_Cgroup_Cpu_Weight_Files_Contain_Invalid_Data_content=-1.verified.txt

@@ -0,0 +1,10 @@
+{
+  Type: InvalidOperationException,
+  Message: Could not parse '/sys/fs/cgroup/cpu.weight' content. Expected to find CPU weight but got '-1' instead.,
+  StackTrace:
+at Microsoft.Shared.Diagnostics.Throw.InvalidOperationException(String message)
+at Microsoft.Extensions.Diagnostics.ResourceMonitoring.Linux.LinuxUtilizationParserCgroupV2.TryGetCgroupRequestCpu(IFileSystem fileSystem, Single& cpuUnits)
+at Microsoft.Extensions.Diagnostics.ResourceMonitoring.Linux.LinuxUtilizationParserCgroupV2.GetCgroupRequestCpu()
+at Microsoft.Extensions.Diagnostics.ResourceMonitoring.Linux.Test.LinuxUtilizationParserCgroupV2Tests.<>c__DisplayClass22_0.<Throws_When_Cgroup_Cpu_Weight_Files_Contain_Invalid_Data>b__0()
+at Xunit.Record.Exception(Func`1 testCode)
+}

test/Libraries/Microsoft.Extensions.Diagnostics.ResourceMonitoring.Tests/Linux/LinuxUtilizationParserCgroupV2Tests.Throws_When_Cgroup_Cpu_Weight_Files_Contain_Invalid_Data_content=0.verified.txt

@@ -0,0 +1,11 @@
+{
+  Type: ArgumentOutOfRangeException,
+  Message: Expected to find CPU weight in range [1-10000] in '/sys/fs/cgroup/cpu.weight', but got '0' instead. (Parameter 'CPU weight'),
+  ParamName: CPU weight,
+  StackTrace:
+at Microsoft.Shared.Diagnostics.Throw.ArgumentOutOfRangeException(String paramName, String message)
+at Microsoft.Extensions.Diagnostics.ResourceMonitoring.Linux.LinuxUtilizationParserCgroupV2.TryGetCgroupRequestCpu(IFileSystem fileSystem, Single& cpuUnits)
+at Microsoft.Extensions.Diagnostics.ResourceMonitoring.Linux.LinuxUtilizationParserCgroupV2.GetCgroupRequestCpu()
+at Microsoft.Extensions.Diagnostics.ResourceMonitoring.Linux.Test.LinuxUtilizationParserCgroupV2Tests.<>c__DisplayClass22_0.<Throws_When_Cgroup_Cpu_Weight_Files_Contain_Invalid_Data>b__0()
+at Xunit.Record.Exception(Func`1 testCode)
+}