1#@!#!123s

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Filename : hugepage_cow_delays.stp

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#!/usr/bin/stap

global huge_cow

probe kernel.function("copy_user_huge_page").return
{
  huge_cow [execname(), pid()]
    <<< (gettimeofday_us() - @entry(gettimeofday_us()))
}

probe begin { printf("Collecting data... press Ctrl-C to stop.\n") }

probe end
{
  printf("\n")
  foreach([name, p] in huge_cow-) {
    printf("%16s(%5d) count=%d sum(us)=%d avg(us)=%d\n",
      name, p, @count(huge_cow[name,p]),
      @sum(huge_cow[name,p]),
      @avg(huge_cow[name,p]))
  }
}