Hi,
I am running MontaVista embedded Linux 2.4.20 on a
Xilinx ML300 board with a PPC. I am receiving a file
of 50 MB over Bluetooth. I profiled the application
and the top 10 rows are:
76219 total
0.0434
69495 __sti_end
2171.7188
2328 __sti
29.1000
1141 __save_flags_ptr_end
11.4100
160 hc_interrupt
0.3279
156 my_memcpy
1.0000
143 trident_interrupt
0.5675
142 XSysAce_RegRead32
1.6905
100 speedo_interrupt
0.1678
85 hci_usb_rx_complete
0.1986
I understand that the function I created called
'my_memcpy' is one that takes more time. However I do
not really understand what the '__sti_end' and '__sti'
do. I think they are interrupts, but when do these
interrupts happen and why? If I profile the system
doing nothing, these functions are again on top of the
list:
70055 total 0.0399
69868 __sti_end 2183.3750
79 XSysAce_RegRead32 0.9405
29 __sti 0.3625
28 XSysAce_RegWrite32 0.5385
11 hc_interrupt 0.0225
7 speedo_interrupt 0.0117
4 _stext 0.1000
3 trident_interrupt 0.0119
3 __save_flags_ptr_end 0.0300
I tried to find info on Google about these functions
but I couldn't find anything useful. I tried the file
where these symbols are exported and it did not help.
Does anyone have a pointer for me to start understand
what these functions are for?
Many thanks. Best regards,
Filipa
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