Zehan, is your application in simulation making any progress? If not then you might miss an update from someone handshaking with this core. It seems the memory location is set to a non-zero value and then this core will wake up.
It might be that the core setting this memory location never runs, or the store gets lost in the process. You may want to understand (1) which address is this core reading from (2) did some other core execute a write to this location You could then dig deeper into why things are disappearing. Also, if this is system boot, the core might wait for a while until it is woken up by the boot CPU. You probably do not wan to boot the kernel in detailed CPU models. Thanks, Stephan On 20.01.2015 2:14, "Zehan Cui via gem5-users" <gem5-users@gem5.org<mailto:gem5-users@gem5.org>> wrote: Hi all, I run a multi-threaded application in full system mode with detailed cpu model. I extract the instruction traces of each cpu, and find that the last cpu keeps executing instructions like the following for at least 1 billion instructions (The max_instructions is set to 1 billion). 8007580397289: system.switch_cpus_17 T0 : @flush_tlb_others+133 : NOP : IntAlu : 8007580397289: system.switch_cpus_17 T0 : @flush_tlb_others+135 : cmp DS:[rbp], 0 8007580397289: system.switch_cpus_17 T0 : @flush_tlb_others+139 : jnz 0xfffffffffffffff8 8007580397602: system.switch_cpus_17 T0 : @flush_tlb_others+133 : NOP : IntAlu : 8007580397602: system.switch_cpus_17 T0 : @flush_tlb_others+135 : cmp DS:[rbp], 0 8007580397602: system.switch_cpus_17 T0 : @flush_tlb_others+139 : jnz 0xfffffffffffffff8 8007580397915: system.switch_cpus_17 T0 : @flush_tlb_others+133 : NOP : IntAlu : 8007580397915: system.switch_cpus_17 T0 : @flush_tlb_others+135 : cmp DS:[rbp], 0 8007580397915: system.switch_cpus_17 T0 : @flush_tlb_others+139 : jnz 0xfffffffffffffff8 8007580398228: system.switch_cpus_17 T0 : @flush_tlb_others+133 : NOP : IntAlu : I run the application with atomic cpu model. The same instruction sequence appears for a while, but soon switches to the instructions of the application. Such problem has bothered me for a while. Does anyone understand this? thanks, zehan -- IMPORTANT NOTICE: The contents of this email and any attachments are confidential and may also be privileged. If you are not the intended recipient, please notify the sender immediately and do not disclose the contents to any other person, use it for any purpose, or store or copy the information in any medium. Thank you. ARM Limited, Registered office 110 Fulbourn Road, Cambridge CB1 9NJ, Registered in England & Wales, Company No: 2557590 ARM Holdings plc, Registered office 110 Fulbourn Road, Cambridge CB1 9NJ, Registered in England & Wales, Company No: 2548782
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