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AN3129 Datasheet(PDF) 6 Page - STMicroelectronics

Part # AN3129
Description  Real-time performance using FIQ interrupt handling in SPEAr MPUs
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

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IRQ latency measurement
AN3129
6/12
Doc ID 16927 Rev 1
This module is linked statically to the kernel image and has user mode interface at:
/sys/kernel/irq_latency
To use the module:
1.
Run the following command:
#ls /sys/kernel/irq_latency
The command output shows four entries:
irq_mode – shows if IRQ latency measurement is 1 (on) or 0 (off/no capture)
fiq-mode – shows if FIQ latency measurement is 1 (on) or 0 (off/no capture)
stats – shows the running statistics of measurements as summary
stats_details – shows detailed log of IRQ latency counters
During kernel booting, the statically linked module is loaded automatically. By default the
module lies dormant and does not capture latency statistics.
2.
To start the capture, you must activate one of the two IRQ handling modes using the
command:
#echo 1 > irq_mode
or
#echo 1 > fiq_mode
irq_mode: in this timer interrupts are handled with an IRQ mechanism.
fiq_mode: in this timer interrupts are handled as FIQ interrupts. FIQ mode is designed
to handle real-time scenarios.
To get the statistics captured by the module, use the command #cat stats repeatedly while
performing other tasks. A typical output is:
Latency
max (usec) : 48
min (usec) : 6
totalsamples : 7798
To get detailed statistics, use the command #cat stats_details repeatedly while performing
other tasks. A typical output is:
Latency:
Counter (usec)
0, 0
1, 0
2, 0
3, 0
4, 0
5, 0
6, 12001
7, 70


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