Re: [PATCH] regmap: rbtree: When adding a reg do a bsearch for target node
From: Charles Keepax
Date: Thu Oct 22 2015 - 05:02:40 EST
On Wed, Oct 21, 2015 at 02:16:14PM +0100, Nikesh Oswal wrote:
> From: Nikesh Oswal <Nikesh.Oswal@xxxxxxxxxxxxxxxx>
If you are going to use your non-opensource email, might as well
use the cirrus one here.
>
> A binary search is much more efficient rather than iterating
> over the rbtree in ascending order which the current code is
> doing.
>
> During initialisation the reg defaults are written to the
> cache in a large chunk and these are always sorted in the
> ascending order so for this situation ideally we should have
> iterated the rbtree in descending order.
>
> But at runtime the drivers may write into the cache in any
> random order so this patch selects to use a bsearch to give
> an optimal runtime performance and also at initialisation
> time when reg defaults are written the performance of binary
> search would be much better than iterating in ascending order
> which the current code was doing.
>
> Signed-off-by: Nikesh Oswal <Nikesh.Oswal@xxxxxxxxxxxxxxxx>
> ---
Patch looks fine to me though:
Reviewed-by: Charles Keepax <ckeepax@xxxxxxxxxxxxxxxxxxxxxxxxxxx>
Thanks,
Charles
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