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Reduce memory fragmentation in x86 #235

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a6e132e
Reduce memory fragmentation in x86
bugale Apr 6, 2022
946e4e0
Merge branch 'main' into bugale/x86frag
galenh Oct 9, 2024
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18 changes: 16 additions & 2 deletions src/detours.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -1339,7 +1339,14 @@ static PVOID detour_alloc_region_from_lo(PBYTE pbLo, PBYTE pbHi)
mbi.State));

if (mbi.State == MEM_FREE && mbi.RegionSize >= DETOUR_REGION_SIZE) {

#ifdef DETOURS_X86
// Reduce memory fragmentation by allocating the end of the region
pbTry += mbi.RegionSize; // Advance pbTry to the end of the free block.
if (pbTry > pbHi) {
pbTry = pbHi;
}
pbTry -= DETOUR_REGION_SIZE; // Move pbTry backwards to ensure that the free block is large enough to hold a trampoline region.
#endif
PVOID pv = VirtualAlloc(pbTry,
DETOUR_REGION_SIZE,
MEM_COMMIT|MEM_RESERVE,
Expand Down Expand Up @@ -1389,7 +1396,14 @@ static PVOID detour_alloc_region_from_hi(PBYTE pbLo, PBYTE pbHi)
mbi.State));

if (mbi.State == MEM_FREE && mbi.RegionSize >= DETOUR_REGION_SIZE) {

#ifdef DETOURS_X86
// Reduce memory fragmentation by allocating the end of the region
pbTry += mbi.RegionSize; // Advance pbTry to the end of the free block.
if (pbTry > pbHi) {
pbTry = pbHi;
}
pbTry -= DETOUR_REGION_SIZE; // Move pbTry backwards to ensure that the free block is large enough to hold a trampoline region.
#endif
PVOID pv = VirtualAlloc(pbTry,
DETOUR_REGION_SIZE,
MEM_COMMIT|MEM_RESERVE,
Expand Down