> [8/9] ia64_acct_gate_on_leave.patch
This is last patch for check point building.
- kernel exit (stack switching from kernel to user)
In contrast, there is only one codes that switches
stack from kernel to user. It is ia64_leave_kernel().
Following patch builds check point on this exit, including
fetching ar.itc, cumulate cycles for stime and stamp updating.
Thanks,
H.Seto
Signed-off-by: Hidetoshi Seto <[EMAIL PROTECTED]>
---
arch/ia64/kernel/entry.S | 20 ++++++++++++++++++++
1 files changed, 20 insertions(+)
Index: linux-2.6.23/arch/ia64/kernel/entry.S
===================================================================
--- linux-2.6.23.orig/arch/ia64/kernel/entry.S
+++ linux-2.6.23/arch/ia64/kernel/entry.S
@@ -995,6 +995,26 @@
shladd in0=loc1,3,r17
mov in1=0
;;
+#ifdef CONFIG_VIRT_CPU_ACCOUNTING
+account_sys_leave:
+ alloc loc0=ar.pfs,2,7,0,0 // keep in0,in1
+ mov loc1=IA64_KR(CURRENT) // M2 (12 cycle read latency)
+ mov loc6=ar.itc
+ ;;
+ add loc2=TI_AC_STAMP+IA64_TASK_SIZE,loc1
+ add loc3=TI_AC_STIME+IA64_TASK_SIZE,loc1
+ ;;
+ ld8 loc4=[loc2] // get last stamp
+ ld8 loc5=[loc3] // cumulated stime
+ ;;
+ sub loc4=loc6,loc4 // elapsed time
+ ;;
+ add loc5=loc5,loc4 // sum
+ ;;
+ st8 [loc2]=loc6 // update stamp
+ st8 [loc3]=loc5 // update stime
+ ;;
+#endif
TEXT_ALIGN(32)
rse_clear_invalid:
#ifdef CONFIG_ITANIUM
-
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