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: DEVICE-MAPPER (LVM) M: Alasdair Kergon <agk@xxxxxxxxxx> M: Mike Snitzer <snitzer@xxxxxxxxxx> M: dm-devel@xxxxxxxxxx L: dm-devel@xxxxxxxxxx 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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