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Fix the heuristics for L3 cache size for Arm64 #71029

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Merged
kunalspathak merged 13 commits into from
Jun 22, 2022
Merged

Fix the heuristics for L3 cache size for Arm64 #71029

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f6310e4
Get cacheLevel for unix
kunalspathak Jun 20, 2022
45c4138
Get cacheLevel for windows
kunalspathak Jun 20, 2022
8b6862c
Get cacheLevel for os
kunalspathak Jun 20, 2022
363490c
add the macro CHECK_CACHE_SIZE
kunalspathak Jun 20, 2022
29ed6db
fix multiplier
kunalspathak Jun 21, 2022
468dc4a
Review comments
kunalspathak Jun 21, 2022
b09e495
Fix linux arm64 build
kunalspathak Jun 21, 2022
c7c905a
Change from std:string to char[]
kunalspathak Jun 21, 2022
0bf5ec1
minor nit
kunalspathak Jun 21, 2022
1f7ce1c
opps should be outside the loop
kunalspathak Jun 21, 2022
cc72139
Replace assert with _ASSERTE
kunalspathak Jun 21, 2022
5671866
CHECK_CACHE_SIZE -> UPDATE_CACHE_SIZE_AND_LEVEL
kunalspathak Jun 21, 2022
aaab0bf
Use GetTotalProcessorCount for windows
kunalspathak Jun 22, 2022
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Use GetTotalProcessorCount for windows
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@kunalspathak
kunalspathak committed Jun 22, 2022
commit aaab0bf88921cdfd71b0e95128c38e73cd0e893e
7 changes: 2 additions & 5 deletions src/coreclr/gc/windows/gcenv.windows.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -403,7 +403,6 @@ size_t GetLogicalProcessorCacheSizeFromOS()
{
size_t cache_size = 0;
size_t cache_level = 0;
uint32_t totalCPUCount = 0;

DWORD nEntries = 0;

Expand Down Expand Up @@ -433,10 +432,6 @@ size_t GetLogicalProcessorCacheSizeFromOS()
cache_level = pslpi[i].Cache.Level;
}
}
else if (pslpi[i].Relationship == RelationProcessorCore)
{
totalCPUCount++;
}
}
cache_size = last_cache_size;
}
Expand All @@ -448,6 +443,8 @@ size_t GetLogicalProcessorCacheSizeFromOS()
#if defined(TARGET_ARM64)
if (cache_level != 3)
{
uint32_t totalCPUCount = GCToOSInterface::GetTotalProcessorCount();

// We expect to get the L3 cache size for Arm64 but currently expected to be missing that info
// from most of the machines.
// Hence, just use the following heuristics at best depending on the CPU count
Expand Down
7 changes: 2 additions & 5 deletions src/coreclr/vm/gcenv.os.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -589,7 +589,6 @@ size_t GetLogicalProcessorCacheSizeFromOS()
{
size_t cache_size = 0;
size_t cache_level = 0;
uint32_t totalCPUCount = 0;
DWORD nEntries = 0;

// Try to use GetLogicalProcessorInformation API and get a valid pointer to the SLPI array if successful. Returns NULL
Expand Down Expand Up @@ -618,10 +617,6 @@ size_t GetLogicalProcessorCacheSizeFromOS()
cache_level = pslpi[i].Cache.Level;
}
}
else if (pslpi[i].Relationship == RelationProcessorCore)
{
totalCPUCount++;
}
}
cache_size = last_cache_size;
}
Expand All @@ -633,6 +628,8 @@ size_t GetLogicalProcessorCacheSizeFromOS()
#if defined(TARGET_ARM64)
if (cache_level != 3)
{
uint32_t totalCPUCount = GCToOSInterface::GetTotalProcessorCount();

// We expect to get the L3 cache size for Arm64 but currently expected to be missing that info
// from most of the machines.
// Hence, just use the following heuristics at best depending on the CPU count
Expand Down