linux-kernel - Re: [PATCH] regmap: rbtree: When adding a reg do a bsearch for target node

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite for Android: free password hash cracker in your pocket

[<prev] [next>] [<thread-prev] [day] [month] [year] [list]

Message-ID: <20151022084442.GE10520@ck-lbox>
Date:	Thu, 22 Oct 2015 09:44:42 +0100
From:	Charles Keepax <ckeepax@...nsource.wolfsonmicro.com>
To:	Nikesh Oswal <nikesh@...nsource.wolfsonmicro.com>
CC:	<broonie@...nel.org>, <gregkh@...uxfoundation.org>,
	<linux-kernel@...r.kernel.org>,
	<patches@...nsource.wolfsonmicro.com>, <Nikesh.Oswal@...rus.com>,
	Nikesh Oswal <Nikesh.Oswal@...fsonmicro.com>
Subject: Re: [PATCH] regmap: rbtree: When adding a reg do a bsearch for
 target node

On Wed, Oct 21, 2015 at 02:16:14PM +0100, Nikesh Oswal wrote:
> From: Nikesh Oswal <Nikesh.Oswal@...fsonmicro.com>

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@...fsonmicro.com>
> ---

Patch looks fine to me though:

Reviewed-by: Charles Keepax <ckeepax@...nsource.wolfsonmicro.com>

Thanks,
Charles
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/