ia64/xen-unstable

view buildconfigs/select-linux-arch @ 18732:4413d53a8320

x86: highmem handling assistance hypercalls

While looking at the origin of very frequently executed hypercalls I
realized that the high page accessor functions in Linux would be good
candidates to handle in the hypervisor - clearing or copying to/from
a high page is a pretty frequent operation (provided there's enough
memory in the domain). While prior to the first submission I only
measured kernel builds (where the results are not hinting at a
meaningful improvement), I now found time to do a more specific
analysis: page clearing is being improved by about 20%, page copying
doesn't seem to significantly benefit (though that may be an effect of
the simplistic copy_page() implementation Xen currently uses) -
nevertheless I would think that if one function is supported by the
hypervisor, then the other should also be.

Signed-off-by: Jan Beulich <jbeulich@novell.com>
author Keir Fraser <keir.fraser@citrix.com>
date Mon Oct 27 13:29:35 2008 +0000 (2008-10-27)
parents 419a141ca16d
children
line source
1 #!/bin/sh
3 ME=$(basename $0)
5 if [ $# -lt 1 ] || [ $# -gt 2 ] ; then
6 echo "usage: $ME <linux-build-directory>" 1>&2
7 exit 1;
8 fi
10 LINUX_DIR=$1
12 case ${XEN_TARGET_ARCH} in
13 x86_32|x86_64)
14 if [ -d ${LINUX_DIR}/arch/x86 ] ; then
15 ARCH=x86
16 elif [ "${XEN_TARGET_ARCH}" = "x86_32" ] ; then
17 ARCH=i386
18 else
19 ARCH=x86_64
20 fi
21 ;;
22 *)
23 ARCH=${XEN_TARGET_ARCH}
24 ;;
25 esac
27 echo "$ME: ${ARCH}" 1>&2
28 echo ${ARCH}
30 exit 0