linux-kernel - Re: The DM_BUFIO_HASH_BITS is defined as 20, any plan to make it flexible?

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: Windows password security audit tool. GUI, reports in PDF.

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

Message-ID: <20141202140015.GB5985@redhat.com>
Date:	Tue, 2 Dec 2014 09:00:17 -0500
From:	Mike Snitzer <snitzer@...hat.com>
To:	zhangxiao <xiao.zhang@...driver.com>
Cc:	agk@...hat.com, linux-kernel@...r.kernel.org,
	NeilBrown <neilb@...e.de>, linux-raid@...r.kernel.org,
	dm-devel@...hat.com
Subject: Re: The DM_BUFIO_HASH_BITS is defined as 20, any plan to make it
 flexible?

On Tue, Dec 02 2014 at  3:43am -0500,
zhangxiao <xiao.zhang@...driver.com> wrote:

> Hi Experts,
> 
> See drivers/md/dm-bufio.c as below:
>   50 /*
>   51  * Buffer hash
>   52  */
>   53 #define DM_BUFIO_HASH_BITS      20
>   54 #define DM_BUFIO_HASH(block) \
>   55         ((((block) >> DM_BUFIO_HASH_BITS) ^ (block)) & \
>   56          ((1 << DM_BUFIO_HASH_BITS) - 1))
> "drivers/md/dm-bufio.c" 1854L, 45375C
> 
> DM_BUFIO_HASH_BITS was defined as 20 and it maybe not fit for some
> use case with limited resources. Do we have any plan to make it more
> flexible? Like module parameter or something else?

No immediate plans.
--
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/