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SubjectRe: The DM_BUFIO_HASH_BITS is defined as 20, any plan to make it flexible?
On 2014年12月02日 16:36, NeilBrown wrote:
> On Tue, 2 Dec 2014 16:32:14 +0800 zhangxiao <xiao.zhang@windriver.com> 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)
> M: Alasdair Kergon <agk@redhat.com>
> M: Mike Snitzer <snitzer@redhat.com>
> M: dm-devel@redhat.com
> L: dm-devel@redhat.com
> W: http://sources.redhat.com/dm
> Q: http://patchwork.kernel.org/project/dm-devel/list/
> T: git git://git.kernel.org/pub/scm/linux/kernel/git/device-mapper/linux-dm.git
> T: quilt http://people.redhat.com/agk/patches/linux/editing/
> S: Maintained
> F: Documentation/device-mapper/
> F: drivers/md/dm*
> F: drivers/md/persistent-data/
> F: include/linux/device-mapper.h
> F: include/linux/dm-*.h
> F: include/uapi/linux/dm-*.h
>
> NeilBrown
>


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