[Xen-devel] [PATCH 0/3] x86: adjust entry frame generation

["Jan Beulich" <JBeulich@xxxxxxxx>]

This set of patches converts the way frames gets created from
using PUSHes/POPs to using MOVes, thus allowing (in certain
cases) to avoid saving/restoring part of the register set.

While the place where the (small) win from this comes from varies
between CPUs, the net effect is a 1 to 2% reduction on a
combined interruption entry and exit when the full state save
can be avoided.

1: use MOV instead of PUSH/POP when saving/restoring register state
2: consolidate frame state manipulation functions
3: save only partial register state where possible

Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>


_______________________________________________
Xen-devel mailing list
Xen-devel@xxxxxxxxxxxxx
http://lists.xen.org/xen-devel