Traces afs_linux_write_begin() into the kernel grab_cache_page_write_begin()

afs_linux_write_begin-indent.stp

// Traces afs_linux_write_begin() into the kernel grab_cache_page_write_begin()

global traceme

function printf_indent(str, parm_str) {
  printf ("%s -> %s  P %s\n", thread_indent(1), str, parm_str);
}
function printf_deindent(str, ret_str) {
  printf ("%s <- %s  R %s\n", thread_indent(-1), str, ret_str);
}

probe module("openafs").function("afs_linux_write_begin").call {
  traceme[tid()] = 1;
  printf_indent(ppfunc(), $$parms);
}
probe module("openafs").function("afs_linux_write_begin").return {
  if (traceme[tid()]) {
    printf_deindent(ppfunc(), $return$);
    delete traceme[tid()];
  }
}

probe kernel.function("grab_cache_page_write_begin").call {
  if (traceme[tid()]) {
    printf_indent(ppfunc(), $$parms);
  }
}
probe kernel.function("grab_cache_page_write_begin").return {
  if (traceme[tid()]) {
    printf_deindent(ppfunc(), $return$);
  }
}

probe kernel.function("pagecache_get_page").call {
  if (traceme[tid()]) {
    printf_indent(ppfunc(), $$parms);
  }
}
probe kernel.function("pagecache_get_page").return {
  if (traceme[tid()]) {
    printf_deindent(ppfunc(), $return$);
  }
}

probe kernel.function("find_get_entry").call {
  if (traceme[tid()]) {
    printf_indent(ppfunc(), $$parms);
  }
}
probe kernel.function("find_get_entry").return {
  if (traceme[tid()]) {
    printf_deindent(ppfunc(), $return$);
  }
}

probe kernel.function("*radix_tree*").call {
  if (traceme[tid()]) {
    printf_indent(ppfunc(), $$parms);
  }
}
probe kernel.function("*radix_tree*").return {
  if (traceme[tid()]) {
    if ($$return$)
      printf_deindent(ppfunc(), $$return$);
    else
      printf_deindent(ppfunc(), "void");
  }
}