[dm-devel] The DM_BUFIO_HASH_BITS is defined as 20, any plan to make it flexible?
NeilBrown
neilb at suse.de
Tue Dec 2 08:36:18 UTC 2014
On Tue, 2 Dec 2014 16:32:14 +0800 zhangxiao <xiao.zhang at 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:
DEVICE-MAPPER (LVM)
M: Alasdair Kergon <agk at redhat.com>
M: Mike Snitzer <snitzer at redhat.com>
M: dm-devel at redhat.com
L: dm-devel at 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
-------------- next part --------------
A non-text attachment was scrubbed...
Name: not available
Type: application/pgp-signature
Size: 811 bytes
Desc: OpenPGP digital signature
URL: <http://listman.redhat.com/archives/dm-devel/attachments/20141202/9a2f1ffc/attachment.sig>
More information about the dm-devel
mailing list