On Thu, 28 Aug 2008, Vegard Nossum wrote:
> On Thu, Aug 28, 2008 at 3:56 PM, Ingo Molnar <mingo@xxxxxxx> wrote:
> > could you resend the final patch please? It's a candidate for .27, if it
> > works out fine.
>
> Here is the combined patch. I've tested it only briefly, and I am
> unsure of whether it still produces lockdep warnings for Daniel or
> not. I wish it would not be applied anywhere unless it was
> officially Reviewed-by: someone. In particular, I'm not quite
> steady with the irq-safe locking (Thomas might want to have a look).
The irq safe locking is the easy part :) Calling free_object w/o the
hash bucket lock held is fine as we removed it already from the bucket
and there is no other reference than the pointer we hold at that point.
>
> printk(KERN_WARNING "ODEBUG: Out of memory. ODEBUG disabled\n");
>
> + /* XXX: Could probably be optimized by transplantation of more than
> + * one entry at a time. */
> for (i = 0; i < ODEBUG_HASH_SIZE; i++, db++) {
> spin_lock_irqsave(&db->lock, flags);
> hlist_for_each_entry_safe(obj, node, tmp, &db->list, node) {
> hlist_del(&obj->node);
> - free_object(obj);
> + hlist_add_head(&obj->node, &freelist);
> }
> spin_unlock_irqrestore(&db->lock, flags);
> +
> + /* Now free them */
> + hlist_for_each_entry_safe(obj, node, tmp, &freelist, node) {
> + hlist_del(&obj->node);
> + free_object(obj);
> + }
> }
> }
What you want is a helper function which moves the complete list from
one head to the other. I'll whip one up.
I'll push it through the tip tree.
Thanks,
tglx
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