From: Andrew Morton <[email protected]>
Date: Thu, 28 Jun 2007 22:24:24 -0700
> So what happens when two quite different threads of control are doing
> IO against two hunks of kmalloced memory which happen to come from the same
> page? Either some (kernel-wide) locking is needed, or that pageframe needs
> to be treated as readonly?
Or you put an atomic_t at the beginning or tail of every SLAB
object. It's a space cost not a runtime cost for the common
case which is:
smp_rmb();
if (atomic_read(&slab_obj->count) == 1)
really_free_it();
else if (atomic_dec_and_test(...))
Note I don't like this variant either. :)
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