[dm-devel] The DM_BUFIO_HASH_BITS is defined as 20, any plan to make it flexible?

[Mike Snitzer]

On Tue, Dec 02 2014 at  3:43am -0500,
zhangxiao <xiao.zhang at windriver.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.