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Grow memory geometrically. (#316)

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This commit is contained in:
Nuno Cruces
2025-09-01 11:57:33 +01:00
committed by GitHub
parent da4638cbff
commit 07fec784e1
2 changed files with 8 additions and 4 deletions
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6
internal/alloc/alloc_unix.go
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@@ -40,9 +40,11 @@ func (m *mmappedMemory) Reallocate(size uint64) []byte {
com := uint64(len(m.buf))
res := uint64(cap(m.buf))
if com < size && size <= res {
// Round up to the page size.
// Grow geometrically, round up to the page size.
rnd := uint64(unix.Getpagesize() - 1)
new := (size + rnd) &^ rnd
new := com + com>>3
new = min(max(size, new), res)
new = (new + rnd) &^ rnd
// Commit additional memory up to new bytes.
err := unix.Mprotect(m.buf[com:new], unix.PROT_READ|unix.PROT_WRITE)

6
internal/alloc/alloc_windows.go
View File

@@ -47,9 +47,11 @@ func (m *virtualMemory) Reallocate(size uint64) []byte {
com := uint64(len(m.buf))
res := uint64(cap(m.buf))
if com < size && size <= res {
// Round up to the page size.
// Grow geometrically, round up to the page size.
rnd := uint64(windows.Getpagesize() - 1)
new := (size + rnd) &^ rnd
new := com + com>>3
new = min(max(size, new), res)
new = (new + rnd) &^ rnd
// Commit additional memory up to new bytes.
_, err := windows.VirtualAlloc(m.addr, uintptr(new), windows.MEM_COMMIT, windows.PAGE_READWRITE)