on init # Create the directory for the trace instance during early init chmod 666 /sys/kernel/tracing/instances/irq_gia_google chmod 666 /sys/kernel/tracing/instances/irq_gia_google/trace chown system system /sys/kernel/tracing/instances/irq_gia_google chown system system /sys/kernel/tracing/instances/irq_gia_google/trace # There are some very high frequency IRQ events happening all the time. Tracing # them is not absolute necessity, but a flood of them is noise for more interesting # events that we want to capture. All these high frequency IRQs have virq < 11. write /sys/kernel/tracing/instances/irq_gia_google/events/irq/filter "irq > 11" # Keep the buffer size small. This size is practically enough for debug purpose. # Having low size helps because this entire buffer gets dumped in bugreport. # Having a large size can impact bugreport size and time it takes to pack/unpack. write /sys/kernel/tracing/instances/irq_gia_google/buffer_size_kb 64