Hugh Dickins <hu...@google.com> writes: > On Thu, 1 Jun 2017, Christoph Lameter wrote: >> >> Ok so debugging was off but the slab cache has a ctor callback which >> mandates that the free pointer cannot use the free object space when >> the object is not in use. Thus the size of the object must be increased to >> accomodate the freepointer. > > Thanks a lot for working that out. Makes sense, fully understood now, > nothing to worry about (though makes one wonder whether it's efficient > to use ctors on high-alignment caches; or whether an internal "zero-me" > ctor would be useful).
Or should we just be using kmem_cache_zalloc() when we allocate from those slabs? Given all the ctor's do is memset to 0. cheers
