From: Rik van Riel <riel@redhat.com>
To: Michel Lespinasse <walken@google.com>
Cc: peterz@infradead.org, daniel.santos@pobox.com,
aarcange@redhat.com, dwmw2@infradead.org,
akpm@linux-foundation.org, linux-mm@kvack.org,
linux-kernel@vger.kernel.org, torvalds@linux-foundation.org
Subject: Re: [PATCH v2 2/9] rbtree: optimize fetching of sibling node
Date: Sun, 05 Aug 2012 19:20:34 -0400 [thread overview]
Message-ID: <501EFFC2.6090700@redhat.com> (raw)
In-Reply-To: <1343946858-8170-3-git-send-email-walken@google.com>
On 08/02/2012 06:34 PM, Michel Lespinasse wrote:
> When looking to fetch a node's sibling, we went through a sequence of:
> - check if node is the parent's left child
> - if it is, then fetch the parent's right child
>
> This can be replaced with:
> - fetch the parent's right child as an assumed sibling
> - check that node is NOT the fetched child
>
> This avoids fetching the parent's left child when node is actually
> that child. Saves a bit on code size, though it doesn't seem to make
> a large difference in speed.
>
> Signed-off-by: Michel Lespinasse<walken@google.com>
Acked-by: Rik van Riel <riel@redhat.com>
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next prev parent reply other threads:[~2012-08-05 23:21 UTC|newest]
Thread overview: 38+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-08-02 22:34 [PATCH v2 0/9] faster augmented rbtree interface Michel Lespinasse
2012-08-02 22:34 ` [PATCH v2 1/9] rbtree test: fix sparse warning about 64-bit constant Michel Lespinasse
2012-08-05 20:47 ` Rik van Riel
2012-08-02 22:34 ` [PATCH v2 2/9] rbtree: optimize fetching of sibling node Michel Lespinasse
2012-08-05 23:20 ` Rik van Riel [this message]
2012-08-06 14:23 ` Peter Zijlstra
2012-08-06 20:46 ` Michel Lespinasse
2012-08-02 22:34 ` [PATCH v2 3/9] rbtree: add __rb_change_child() helper function Michel Lespinasse
2012-08-06 1:00 ` Rik van Riel
2012-08-06 14:22 ` Peter Zijlstra
2012-08-07 0:04 ` Michel Lespinasse
2012-08-02 22:34 ` [PATCH v2 4/9] rbtree: place easiest case first in rb_erase() Michel Lespinasse
2012-08-06 1:13 ` Rik van Riel
2012-08-02 22:34 ` [PATCH v2 5/9] rbtree: handle 1-child recoloring in rb_erase() instead of rb_erase_color() Michel Lespinasse
2012-08-06 1:27 ` Rik van Riel
2012-08-02 22:34 ` [PATCH v2 6/9] rbtree: low level optimizations in rb_erase() Michel Lespinasse
2012-08-06 1:41 ` Rik van Riel
2012-08-06 14:21 ` Peter Zijlstra
2012-08-06 20:50 ` Michel Lespinasse
2012-08-06 20:58 ` Peter Zijlstra
2012-08-06 21:20 ` Michel Lespinasse
2012-08-06 21:21 ` Michel Lespinasse
2012-08-02 22:34 ` [PATCH v2 7/9] rbtree: augmented rbtree test Michel Lespinasse
2012-08-06 2:11 ` Rik van Riel
2012-08-02 22:34 ` [PATCH v2 8/9] rbtree: faster augmented rbtree manipulation Michel Lespinasse
2012-08-06 2:12 ` Rik van Riel
2012-08-06 14:17 ` Peter Zijlstra
2012-08-06 15:38 ` Peter Zijlstra
2012-08-06 21:55 ` Michel Lespinasse
2012-08-07 7:12 ` [PATCH] rbtree: add RB_DECLARE_CALLBACKS() macro Michel Lespinasse
2012-08-06 14:25 ` [PATCH v2 8/9] rbtree: faster augmented rbtree manipulation Peter Zijlstra
2012-08-06 21:34 ` Michel Lespinasse
2012-08-06 21:36 ` Peter Zijlstra
2012-08-06 14:29 ` Peter Zijlstra
2012-08-06 21:38 ` Michel Lespinasse
2012-08-02 22:34 ` [PATCH v2 9/9] rbtree: remove prior augmented rbtree implementation Michel Lespinasse
2012-08-02 22:41 ` Joe Perches
2012-08-06 2:13 ` Rik van Riel
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