CODEWITHSUNDEEP
linux-kernelkernel-module
sam
sam

Reputation: 2579

find process time in kernel routines as percentage of elapsed time since process started

I am trying to find the percentage of time a process has been in kernel routines since time it has started. The problem is that I am not sure what arguments I should be passing to the function: do_posix_clock_monotonic_gettime()

What am I meant to pass into this?

Thanks

Upvotes: 3

Views: 1447

Answers (1)

Dan Aloni
Dan Aloni

Reputation: 4098

On Linux 2.6.39, do_posix_clock_monotomic_gettime is defined as such in include/linux/time.h:

#define do_posix_clock_monotonic_gettime(ts) ktime_get_ts(ts)

ktime_get_ts is implemented in kernel/time/timekeeping.c. The comment above the implementation explains about the argument:

/**
 * ktime_get_ts - get the monotonic clock in timespec format
 * @ts:         pointer to timespec variable
 *
 * The function calculates the monotonic clock from the realtime
 * clock and the wall_to_monotonic offset and stores the result
 * in normalized timespec format in the variable pointed to by @ts.
 */

Upvotes: 1

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