linux/drivers/block/xen-blkback
Roger Pau Monne ffb1dabd1e xen-blkback: don't store dev_bus_addr
dev_bus_addr returned in the grant ref map operation is the mfn of the
passed page, there's no need to store it in the persistent grant
entry, since we can always get it provided that we have the page.

This reduces the memory overhead of persistent grants in blkback.

While at it, rename the 'seg[i].buf' to be 'seg[i].offset' as
it makes much more sense - as we use that value in bio_add_page
which as the fourth argument expects the offset.

We hadn't used the physical address as part of this at all.

Signed-off-by: Roger Pau Monné <roger.pau@citrix.com>
Cc: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Cc: xen-devel@lists.xen.org
[v1: s/buf/offset/]
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
2013-03-19 12:50:00 -04:00
..
blkback.c xen-blkback: don't store dev_bus_addr 2013-03-19 12:50:00 -04:00
common.h xen-blkback: don't store dev_bus_addr 2013-03-19 12:50:00 -04:00
Makefile xen/blkback: Squash vbd.c,interface.c in blkback.c and xenbus.c respectivly. 2011-04-20 11:57:59 -04:00
xenbus.c xen/blkback: Change statistics counter types to unsigned 2013-03-11 13:56:54 -04:00