> [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 <seto.hidetoshi@xxxxxxxxxxxxxx> --- 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 - To unsubscribe from this list: send the line "unsubscribe linux-ia64" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
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