linux/drivers/xen/biomerge.c, branch v2.6.39-rc2Linux Kernel (branches are rebased on master from time to time)https://sre.ring0.de/linux/atom?h=v2.6.39-rc22010-10-18T14:40:28Zxen: define BIOVEC_PHYS_MERGEABLE()2010-10-18T14:40:28ZJeremy Fitzhardingejeremy.fitzhardinge@citrix.com2009-02-09T20:05:46Zurn:sha1:d8e0420603cf1ce9cb459c00ea0b7337de41b968
Impact: allow Xen control of bio merging
When running in Xen domain with device access, we need to make sure
the block subsystem doesn't merge requests across pages which aren't
machine physically contiguous. To do this, we define our own
BIOVEC_PHYS_MERGEABLE. When CONFIG_XEN isn't enabled, or we're not
running in a Xen domain, this has identical behaviour to the normal
implementation. When running under Xen, we also make sure the
underlying machine pages are the same or adjacent.
Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>