sudo sh -c "echo 1 > /sys/kernel/debug/tracing/options/latency-format"
sudo sh -c "echo 1 > /sys/kernel/debug/tracing/tracing_enabled"
sudo sh -c "echo 1 > /sys/kernel/debug/tracing/tracing_on"
sudo sh -c "echo function > /sys/kernel/debug/tracing/current_tracer"
###Do whatever you need to do to trigger the bug
###Save the trace log:
sudo sh -c "bzip2 -c /sys/kernel/debug/tracing/trace > /tmp/trace.bz2"
But take note that this is possible only if FTRACE is enabled:
Mine Ubuntu 10.10's config (default):
/boot/config-2.6.35-22-generic:CONFIG_HAVE_FTRACE_NMI_ENTER=y
/boot/config-2.6.35-22-generic:CONFIG_HAVE_DYNAMIC_FTRACE=y
/boot/config-2.6.35-22-generic:CONFIG_HAVE_FTRACE_MCOUNT_RECORD=y
/boot/config-2.6.35-22-generic:CONFIG_FTRACE_NMI_ENTER=y
/boot/config-2.6.35-22-generic:CONFIG_FTRACE=y
/boot/config-2.6.35-22-generic:CONFIG_FTRACE_SYSCALLS=y
/boot/config-2.6.35-22-generic:CONFIG_DYNAMIC_FTRACE=y
/boot/config-2.6.35-22-generic:CONFIG_FTRACE_MCOUNT_RECORD=y
/boot/config-2.6.35-22-generic:# CONFIG_FTRACE_STARTUP_TEST is not set
On Tue, Oct 4, 2011 at 2:24 PM, Amit Nagal <helloin.amit@xxxxxxxxx> wrote:
Hi ,
i have a gap of 2-3 ms between 2 usb interrupts callback .
i want to know which kernel/user threads execute in the gap of 2-3 ms .
basically i want to log schedule history between 2 usb interrupts callback .
which data structures / functions can i use to furnish schedule
logging history for this case ?
Regards
Amit Nagal
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Peter Teoh
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