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fixalloc: add comment about tail waste

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Hans 2021-08-02 11:59:58 +08:00
parent 3fe82bdf5e
commit e08b4c66b8
1 changed files with 3 additions and 3 deletions
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6
src/runtime/mfixalloc.go
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@ -30,8 +30,8 @@ type fixalloc struct {
arg unsafe.Pointer arg unsafe.Pointer
list *mlink list *mlink
chunk uintptr // use uintptr instead of unsafe.Pointer to avoid write barriers chunk uintptr // use uintptr instead of unsafe.Pointer to avoid write barriers
nchunk uint32 nchunk uint32 // bytes remaining in current chunk
nalloc uint32 nalloc uint32 // size of new chunks in bytes
inuse uintptr // in-use bytes now inuse uintptr // in-use bytes now
stat *sysMemStat stat *sysMemStat
zero bool // zero allocations zero bool // zero allocations
@ -57,7 +57,7 @@ func (f *fixalloc) init(size uintptr, first func(arg, p unsafe.Pointer), arg uns
f.list = nil f.list = nil
f.chunk = 0 f.chunk = 0
f.nchunk = 0 f.nchunk = 0
f.nalloc = uint32(_FixAllocChunk / f.size * f.size) f.nalloc = uint32(_FixAllocChunk / size * size) // Round _FixAllocChunk down to an exact multiple of size to eliminate tail waste
f.inuse = 0 f.inuse = 0
f.stat = stat f.stat = stat
f.zero = true f.zero = true