Fix LLC cache issue on Apple M1 (#64576)

Author: EgorBo

src/coreclr/gc/unix/gcenv.unix.cpp

@@ -946,7 +946,12 @@ static size_t GetLogicalProcessorCacheSizeFromOS()
     {
         int64_t cacheSizeFromSysctl = 0;
         size_t sz = sizeof(cacheSizeFromSysctl);
-        const bool success = sysctlbyname("hw.l3cachesize", &cacheSizeFromSysctl, &sz, nullptr, 0) == 0
+        const bool success = false
+            // macOS-arm64: Since macOS 12.0, Apple added ".perflevelX." to determinate cache sizes for efficiency 
+            // and performance cores separetely. "perflevel0" stands for "performance"
+            || sysctlbyname("hw.perflevel0.l2cachesize", &cacheSizeFromSysctl, &sz, nullptr, 0) == 0
+            // macOS-arm64: these report cache sizes for efficiency cores only:
+            || sysctlbyname("hw.l3cachesize", &cacheSizeFromSysctl, &sz, nullptr, 0) == 0
             || sysctlbyname("hw.l2cachesize", &cacheSizeFromSysctl, &sz, nullptr, 0) == 0
             || sysctlbyname("hw.l1dcachesize", &cacheSizeFromSysctl, &sz, nullptr, 0) == 0;
         if (success)

src/coreclr/pal/src/misc/sysinfo.cpp

@@ -613,9 +613,15 @@ PAL_GetLogicalProcessorCacheSizeFromOS()
     {
         int64_t cacheSizeFromSysctl = 0;
         size_t sz = sizeof(cacheSizeFromSysctl);
-        const bool success = sysctlbyname("hw.l3cachesize", &cacheSizeFromSysctl, &sz, nullptr, 0) == 0
+        const bool success = false
+            // macOS-arm64: Since macOS 12.0, Apple added ".perflevelX." to determinate cache sizes for efficiency 
+            // and performance cores separetely. "perflevel0" stands for "performance"
+            || sysctlbyname("hw.perflevel0.l2cachesize", &cacheSizeFromSysctl, &sz, nullptr, 0) == 0
+            // macOS-arm64: these report cache sizes for efficiency cores only:
+            || sysctlbyname("hw.l3cachesize", &cacheSizeFromSysctl, &sz, nullptr, 0) == 0
             || sysctlbyname("hw.l2cachesize", &cacheSizeFromSysctl, &sz, nullptr, 0) == 0
             || sysctlbyname("hw.l1dcachesize", &cacheSizeFromSysctl, &sz, nullptr, 0) == 0;
+
         if (success)
         {
             _ASSERTE(cacheSizeFromSysctl > 0);