ia64/xen-unstable

view config/x86_32.mk @ 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 6ed9b42d1ec4
children
line source
1 CONFIG_X86 := y
2 CONFIG_X86_32 := y
3 CONFIG_X86_$(XEN_OS) := y
5 CONFIG_HVM := y
6 CONFIG_MIGRATE := y
7 CONFIG_XCUTILS := y
8 CONFIG_IOEMU := y
10 CFLAGS += -m32 -march=i686
12 # Use only if calling $(LD) directly.
13 LDFLAGS_DIRECT_OpenBSD = _obsd
14 LDFLAGS_DIRECT_FreeBSD = _fbsd
15 LDFLAGS_DIRECT += -melf_i386$(LDFLAGS_DIRECT_$(XEN_OS))