centos man page for nr_free_zone_pages

NR_FREE_ZONE_PAGES(9)					    Memory Management in Linux					     NR_FREE_ZONE_PAGES(9)

NAME
       nr_free_zone_pages - count number of pages beyond high watermark

SYNOPSIS
       unsigned long nr_free_zone_pages(int offset);

ARGUMENTS
       offset
	   The zone index of the highest zone

DESCRIPTION
       nr_free_zone_pages counts the number of counts pages which are beyond the high watermark within all zones at or below a given zone index.
       For each zone, the number of pages is calculated as: present_pages - high_pages

COPYRIGHT
Kernel Hackers Manual 3.10					     June 2014						     NR_FREE_ZONE_PAGES(9)