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. :) - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/