linux-kernel - Re: [PATCH 05/13] rbtree: performance and correctness test

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Date:	Wed, 11 Jul 2012 14:30:30 -0500
From:	Daniel Santos <danielfsantos@....net>
To:	Michel Lespinasse <walken@...gle.com>
CC:	Michal Nazarewicz <mina86@...a86.com>, aarcange@...hat.com,
	dwmw2@...radead.org, riel@...hat.com, peterz@...radead.org,
	daniel.santos@...ox.com, axboe@...nel.dk, ebiederm@...ssion.com,
	linux-mm@...ck.org, akpm@...ux-foundation.org,
	linux-kernel@...r.kernel.org, torvalds@...ux-foundation.org
Subject: Re: [PATCH 05/13] rbtree: performance and correctness test

On 07/11/2012 01:14 AM, Michel Lespinasse wrote:
> On Tue, Jul 10, 2012 at 5:27 AM, Michal Nazarewicz <mina86@...a86.com> wrote:
>> On Tue, 10 Jul 2012 01:35:15 +0200, Michel Lespinasse <walken@...gle.com> wrote:
>>> +       u32 prev_key = 0;
>>> +
>>> +       for (rb = rb_first(&root); rb; rb = rb_next(rb)) {
>>> +               struct test_node *node = rb_entry(rb, struct test_node,
>>> rb);
>>> +               WARN_ON_ONCE(node->key < prev_key);
>> What if for some reason we generate node with key equal zero or two keys
>> with the same value?  It may not be the case for current code, but someone
>> might change it in the future.  I think <= is safer here.
> No, it's not illegal for two nodes to have the same key; the second
> one to be inserted will just get placed after the first one. The
> rbtree library doesn't care either way as it's not even aware of the
> key values :)
Right.  This is strictly a function of your insert function. In my
generic rbtree patch set, there is a concept of unique or non-unique
keys, but this doesn't exist in the rbtree library its self.
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