trace: improve usefulness of hypercall trace record

Trace hypercalls using a more useful trace record format.

The EIP field is removed (it was always somewhere in the hypercall
page) and include selected hypercall arguments (e.g., the number of
calls in a multicall, and the number of PTE updates in an mmu_update
etc.).  12 bits in the first extra word are used to indicate which
arguments are present in the record and what size they are (32 or
64-bit).

This is an incompatible record format so a new event ID is used so
tools can distinguish between the two formats.

Signed-off-by: David Vrabel <david.vrabel@citrix.com>
Acked-by: George Dunlap <george.dunlap@citrix.com>
Committed-by: Keir Fraser <keir@xen.org>

1 files changed, 6 insertions, 0 deletions

diff --git a/tools/xentrace/xentrace_format b/tools/xentrace/xentrace_format
index e13b05b734..bdcab096ea 100644
--- a/tools/xentrace/xentrace_format
+++ b/tools/xentrace/xentrace_format
@@ -111,6 +111,8 @@ D7REC  = "IIIIIII"
 last_tsc = [0]
 
 TRC_TRACE_IRQ = 0x1f004
+TRC_PV_HYPERCALL_V2 = 0x20100d
+
 NR_VECTORS = 256
 irq_measure = [{'count':0, 'tot_cycles':0, 'max_cycles':0}] * NR_VECTORS
 
@@ -197,6 +199,10 @@ while not interrupted:
             d3 = irq_measure[d1]['tot_cycles']
             d4 = irq_measure[d1]['max_cycles']
 
+        if event == TRC_PV_HYPERCALL_V2:
+            # Mask off the argument present bits.
+            d1 &= 0x000fffff
+
         #tsc = (tscH<<32) | tscL
 
         #print i, tsc