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

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On 2014年12月02日 16:36, NeilBrown wrote:
On Tue, 2 Dec 2014 16:32:14 +0800 zhangxiao <xiao.zhang@xxxxxxxxxxxxx> wrote:

Hi NeilBrown,

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?


Thanks, but this question should be address to:

Thank you for your kindly remind. :-)

Regards
Xiao

DEVICE-MAPPER  (LVM)
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M:	Mike Snitzer <snitzer@xxxxxxxxxx>
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T:	quilt http://people.redhat.com/agk/patches/linux/editing/
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NeilBrown


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