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Fix mmap based allocator

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This commit is contained in:
Lou Knauer 2022-07-25 14:28:49 +02:00
parent a8bc250600
commit 9830f3c5d4
1 changed files with 9 additions and 4 deletions
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13
internal/memstore/allocator.go
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@ -18,6 +18,7 @@ var allocatorLock sync.Mutex
var allocatorPool [][]byte
func RequestBytes(size int) []byte {
requested := size
size = (size + bufferSizeInBytes - 1) / bufferSizeInBytes * bufferSizeInBytes
if size == bufferSizeInBytes {
allocatorLock.Lock()
@ -31,16 +32,20 @@ func RequestBytes(size int) []byte {
}
pagesize := os.Getpagesize()
if size < pagesize || pagesize%size != 0 {
if size < pagesize || size%pagesize != 0 {
panic("page size and buffer size do not go with each other")
}
bytes, err := unix.Mmap(-1, 0, size, unix.PROT_READ|unix.PROT_WRITE, unix.MAP_ANONYMOUS)
bytes, err := unix.Mmap(-1, 0, size, unix.PROT_READ|unix.PROT_WRITE, unix.MAP_ANONYMOUS|unix.MAP_SHARED)
if err != nil {
panic(err)
panic("unix.Mmap failed: " + err.Error())
}
return bytes
if cap(bytes) != size {
panic("whoops?")
}
return bytes[:requested]
}
func ReleaseBytes(bytes []byte) {