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AN3129 Datasheet(PDF) 6 Page - STMicroelectronics |
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AN3129 Datasheet(HTML) 6 Page - STMicroelectronics |
6 / 12 page 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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