Re: Emulate Rpi with QEMU fails

[Thomas]

Interesting enough is: my top figure reported by perf is like yours:

Samples: 6M of event 'cycles:u', Event count (approx.): 1936571734942
Overhead  Command          Shared Object                  Symbol
   7,95%  qemu-system-arm  qemu-system-arm                [.]
helper_lookup_tb_ptr                                                        
◆
   4,16%  qemu-system-arm  qemu-system-arm                [.]
cpu_get_tb_cpu_state                                                        
▒
   2,52%  qemu-system-arm  libpthread-2.32.so             [.]
__pthread_mutex_lock                                                        
▒
   2,06%  qemu-system-arm  qemu-system-arm                [.]
qht_lookup_custom                                                           
▒
   1,66%  qemu-system-arm  qemu-system-arm                [.]
tlb_set_page_with_attrs                                                     
▒
   1,61%  qemu-system-arm  libpthread-2.32.so             [.]
__pthread_mutex_unlock_usercnt                                              
▒
   1,59%  qemu-system-arm  qemu-system-arm                [.]
get_phys_addr                                                               
▒
   1,27%  qemu-system-arm  qemu-system-arm                [.]
cpu_exec                                                                    
▒
   1,23%  qemu-system-arm  qemu-system-arm                [.]
object_class_dynamic_cast_assert                                            
▒
   0,98%  qemu-system-arm  libc-2.32.so                   [.]
_int_malloc                                                                 
▒
   0,95%  qemu-system-arm  qemu-system-arm                [.]
object_dynamic_cast_assert                                                  
▒
   0,95%  qemu-system-arm  qemu-system-arm                [.]
tb_htable_lookup                                                            
▒
   0,92%  qemu-system-arm  qemu-system-arm                [.]
tcg_gen_code                                                                
▒
   0,91%  qemu-system-arm  qemu-system-arm                [.]
qemu_mutex_lock_impl                                                        
▒
   0,75%  qemu-system-arm  qemu-system-arm                [.]
get_page_addr_code_hostp                                                    
▒
   0,73%  qemu-system-arm  qemu-system-arm                [.]
tcg_optimize                                                                
▒
   0,71%  qemu-system-arm  qemu-system-arm                [.]
qemu_mutex_unlock_impl                                                      
▒
   0,69%  qemu-system-arm  libc-2.32.so                   [.]
_int_free                                                                   
▒
   0,64%  qemu-system-arm  qemu-system-arm                [.]
tb_flush_jmp_cache                                                          
▒
   0,63%  qemu-system-arm  qemu-system-arm                [.]
address_space_ldl_le                                                        
▒
   0,62%  qemu-system-arm  libpthread-2.32.so             [.]
__lll_lock_wait                                                             
▒
   0,58%  qemu-system-arm  libpthread-2.32.so             [.]
pthread_cond_wait@@GLIBC_2.3.2                                              
▒
   0,52%  qemu-system-arm  qemu-system-arm                [.]
cpu_reset_interrupt                                                         
▒
   0,52%  qemu-system-arm  libc-2.32.so                   [.]
cfree@GLIBC_2.2.5                                                           
▒
   0,52%  qemu-system-arm  qemu-system-arm                [.]
qemu_set_irq                                                                
▒

However the absolute time is 3-4 minutes.
And I don't know where I should start optimization now.



Am 07.10.20 um 14:02 schrieb Alex Bennée:
> Thomas Schneider <74cmonty@gmail.com> writes:
>
>> Are you referring to this tool?
>> https://github.com/stefano-garzarella/qemu-boot-time 
>> <https://github.com/stefano-garzarella/qemu-boot-time>
> No - just plain perf:
>
>   perf record $QEMU $ARGS
>
> Then a "perf report" which will show you the hotspots, for example:
>
>    8.92%  qemu-system-aar  qemu-system-aarch64      [.] helper_lookup_tb_ptr
>    4.76%  qemu-system-aar  qemu-system-aarch64      [.] liveness_pass_1
>    3.69%  qemu-system-aar  qemu-system-aarch64      [.] tcg_gen_code
>    2.95%  qemu-system-aar  qemu-system-aarch64      [.] qht_lookup_custom
>    2.93%  qemu-system-aar  qemu-system-aarch64      [.] tcg_optimize
>    1.28%  qemu-system-aar  qemu-system-aarch64      [.] tcg_out_opc.isra.15
>    1.09%  qemu-system-aar  qemu-system-aarch64      [.] get_phys_addr_lpae
>    1.09%  qemu-system-aar  [kernel.kallsyms]        [k] 
> isolate_freepages_block
>    1.05%  qemu-system-aar  qemu-system-aarch64      [.] cpu_get_tb_cpu_state
>    0.98%  qemu-system-aar  [kernel.kallsyms]        [k] do_syscall_64
>    0.94%  qemu-system-aar  qemu-system-aarch64      [.] tb_lookup_cmp
>    0.78%  qemu-system-aar  qemu-system-aarch64      [.] init_ts_info
>    0.73%  qemu-system-aar  qemu-system-aarch64      [.] tb_htable_lookup
>    0.73%  qemu-system-aar  qemu-system-aarch64      [.] tb_gen_code
>    0.73%  qemu-system-aar  qemu-system-aarch64      [.] 
> tlb_set_page_with_attrs
>
>>
>> Am 07.10.2020 um 13:00 schrieb Alex Bennée:
>>> perf to record your boot
>