1<html><head><meta http-equiv="Content-Type" content="text/html; charset=ANSI_X3.4-1968"><title>nr_free_zone_pages</title><meta name="generator" content="DocBook XSL Stylesheets V1.78.1"><link rel="home" href="index.html" title="The Linux Kernel API"><link rel="up" href="ch04s03.html" title="More Memory Management Functions"><link rel="prev" href="API-alloc-pages-exact-nid.html" title="alloc_pages_exact_nid"><link rel="next" href="API-nr-free-pagecache-pages.html" title="nr_free_pagecache_pages"></head><body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center"><span class="phrase">nr_free_zone_pages</span></th></tr><tr><td width="20%" align="left"><a accesskey="p" href="API-alloc-pages-exact-nid.html">Prev</a>&#160;</td><th width="60%" align="center">More Memory Management Functions</th><td width="20%" align="right">&#160;<a accesskey="n" href="API-nr-free-pagecache-pages.html">Next</a></td></tr></table><hr></div><div class="refentry"><a name="API-nr-free-zone-pages"></a><div class="titlepage"></div><div class="refnamediv"><h2>Name</h2><p>nr_free_zone_pages &#8212; 
2     count number of pages beyond high watermark
3 </p></div><div class="refsynopsisdiv"><h2>Synopsis</h2><div class="funcsynopsis"><table border="0" class="funcprototype-table" summary="Function synopsis" style="cellspacing: 0; cellpadding: 0;"><tr><td><code class="funcdef">unsigned long <b class="fsfunc">nr_free_zone_pages </b>(</code></td><td>int <var class="pdparam">offset</var><code>)</code>;</td></tr></table><div class="funcprototype-spacer">&#160;</div></div></div><div class="refsect1"><a name="idp1124526564"></a><h2>Arguments</h2><div class="variablelist"><dl class="variablelist"><dt><span class="term"><em class="parameter"><code>offset</code></em></span></dt><dd><p>
4     The zone index of the highest zone
5    </p></dd></dl></div></div><div class="refsect1"><a name="idp1124528196"></a><h2>Description</h2><p>
6   <code class="function">nr_free_zone_pages</code> counts the number of counts pages which are beyond the
7   high watermark within all zones at or below a given zone index.  For each
8   zone, the number of pages is calculated as:
9   managed_pages - high_pages
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