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FEX: Name remaining allocations as "Misc"

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This captures the remaining FEX allocations that /aren't/ coming from
JEMalloc, allowing us to separate our mapped regions versus just
jemalloc allocations.

With some additional naming in jemalloc (which I'm not adding here) this
gets us interesting results:
```
        Misc resident:        54 MiB
    JEMalloc resident:        208 MiB
```

So 208MB of active jemalloc allocations in this particular case. These will be able to be tracked in heaptrack-like applications if careful.
This should let us target down whatever live allocations we're keeping
large amounts of data around if possible.
This commit is contained in:
Ryan Houdek committed 2025-10-10 17:34:03 -07:00
1 parent 033310234e
commit 474f2dc267
11 files changed
+29 -8
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FEXCore/Source/Utils/Allocator.cpp
+4 -4
View File
@@ -53,7 +53,7 @@ void* FEX_mmap(void* addr, size_t length, int prot, int flags, int fd, off_t off
}
if (flags & MAP_ANONYMOUS) {
prctl(PR_SET_VMA, PR_SET_VMA_ANON_NAME, Result, length, "FEXMem");
VirtualName("FEXMem", Result, length);
}
return Result;
}
@@ -93,7 +93,7 @@ void* DisableSBRKAllocations() {
// calls won't allocate any memory through that.
void* AlignedBRK = reinterpret_cast<void*>(FEXCore::AlignUp(reinterpret_cast<uintptr_t>(StartingSBRK), FEXCore::Utils::FEX_PAGE_SIZE));
void* AfterBRK =
mmap(AlignedBRK, FEXCore::Utils::FEX_PAGE_SIZE, PROT_NONE, MAP_PRIVATE | MAP_ANONYMOUS | MAP_FIXED_NOREPLACE | MAP_NORESERVE, -1, 0);
::mmap(AlignedBRK, FEXCore::Utils::FEX_PAGE_SIZE, PROT_NONE, MAP_PRIVATE | MAP_ANONYMOUS | MAP_FIXED_NOREPLACE | MAP_NORESERVE, -1, 0);
if (AfterBRK == INVALID_PTR) {
// Couldn't allocate the page after the aligned brk? This should never happen.
// FEXCore::LogMan isn't configured yet so we just need to print the message.
@@ -294,7 +294,7 @@ fextl::vector<MemoryRegion> StealMemoryRegion(uintptr_t Begin, uintptr_t End) {
--StackRegionIt;
auto Alloc =
mmap(StackRegionIt->Ptr, StackRegionIt->Size, PROT_READ | PROT_WRITE, MAP_ANONYMOUS | MAP_NORESERVE | MAP_PRIVATE | MAP_FIXED, -1, 0);
::mmap(StackRegionIt->Ptr, StackRegionIt->Size, PROT_READ | PROT_WRITE, MAP_ANONYMOUS | MAP_NORESERVE | MAP_PRIVATE | MAP_FIXED, -1, 0);
LogMan::Throw::AFmt(Alloc != MAP_FAILED, "mmap({},{:x}) failed", fmt::ptr(StackRegionIt->Ptr), StackRegionIt->Size);
LogMan::Throw::AFmt(Alloc == StackRegionIt->Ptr, "mmap returned {} instead of {}", Alloc, fmt::ptr(StackRegionIt->Ptr));
@@ -305,7 +305,7 @@ fextl::vector<MemoryRegion> StealMemoryRegion(uintptr_t Begin, uintptr_t End) {
// Block remaining memory gaps
for (auto RegionIt = Regions.begin(); RegionIt != Regions.end(); ++RegionIt) {
auto Alloc = mmap(RegionIt->Ptr, RegionIt->Size, PROT_NONE, MAP_ANONYMOUS | MAP_NORESERVE | MAP_PRIVATE | MAP_FIXED_NOREPLACE, -1, 0);
auto Alloc = ::mmap(RegionIt->Ptr, RegionIt->Size, PROT_NONE, MAP_ANONYMOUS | MAP_NORESERVE | MAP_PRIVATE | MAP_FIXED_NOREPLACE, -1, 0);
LogMan::Throw::AFmt(Alloc != MAP_FAILED, "mmap({},{:x}) failed", fmt::ptr(RegionIt->Ptr), RegionIt->Size);
LogMan::Throw::AFmt(Alloc == RegionIt->Ptr, "mmap returned {} instead of {}", Alloc, fmt::ptr(RegionIt->Ptr));