xen: Make all performance counter per-cpu, avoiding the need to update

them with atomic (locked) ops.

Conversion here isn't complete in the sense that many places still use
the old per-CPU accessors (which are now redundant). Since the patch
is already rather big, I'd prefer replacing those in a subsequent
patch.

While doing this, I also converted x86's multicall macros to no longer
require inclusion of asm-offsets.h in the respective C file (on IA64
the use of asm-offsets.h in C sources seems more wide spread, hence
there I rather used IA64_ prefixes for the otherwise conflicting
performance counter indices).

On x86, a few counter increments get moved a little, to avoid
duplicate counting of preempted hypercalls.

Also, a few counters are being added.

IA64 changes only compile-tested, hence somebody doing active IA64
work may want to have a close look at those changes.

Signed-off-by: Jan Beulich <jbeulich@novell.com>

1 files changed, 5 insertions, 0 deletions

diff --git a/xen/common/multicall.c b/xen/common/multicall.c
index 1a43838ca0..c03002256e 100644
--- a/xen/common/multicall.c
+++ b/xen/common/multicall.c
@@ -10,6 +10,7 @@
 #include <xen/event.h>
 #include <xen/multicall.h>
 #include <xen/guest_access.h>
+#include <xen/perfc.h>
 #include <asm/current.h>
 #include <asm/hardirq.h>
 
@@ -69,14 +70,18 @@ do_multicall(
         guest_handle_add_offset(call_list, 1);
     }
 
+    perfc_incr(calls_to_multicall);
+    perfc_add(calls_from_multicall, nr_calls);
     mcs->flags = 0;
     return 0;
 
  fault:
+    perfc_incr(calls_to_multicall);
     mcs->flags = 0;
     return -EFAULT;
 
  preempted:
+    perfc_add(calls_from_multicall, i);
     mcs->flags = 0;
     return hypercall_create_continuation(
         __HYPERVISOR_multicall, "hi", call_list, nr_calls-i);