<?xml version="1.0" encoding="ANSI_X3.4-1968" standalone="no"?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml"><head><meta http-equiv="Content-Type" content="text/html; charset=ANSI_X3.4-1968" /><title>proc_flush_task</title><meta name="generator" content="DocBook XSL Stylesheets V1.75.2" /><link rel="home" href="index.html" title="Linux Filesystems API" /><link rel="up" href="ch02s02.html" title="proc filesystem interface" /><link rel="prev" href="ch02s02.html" title="proc filesystem interface" /><link rel="next" href="ch03.html" title="Chapter 3. The Filesystem for Exporting Kernel Objects" /></head><body><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center"><span>proc_flush_task</span></th></tr><tr><td width="20%" align="left"><a accesskey="p" href="ch02s02.html">Prev</a> </td><th width="60%" align="center">proc filesystem interface</th><td width="20%" align="right"> <a accesskey="n" href="ch03.html">Next</a></td></tr></table><hr /></div><div class="refentry" title="proc_flush_task"><a id="API-proc-flush-task"></a><div class="titlepage"></div><div class="refnamediv"><h2>Name</h2><p>proc_flush_task —
Remove dcache entries for <em class="parameter"><code>task</code></em> from the /proc dcache.
</p></div><div class="refsynopsisdiv" title="Synopsis"><h2>Synopsis</h2><div class="funcsynopsis"><table border="0" summary="Function synopsis" cellspacing="0" cellpadding="0" class="funcprototype-table"><tr><td><code class="funcdef">void <b class="fsfunc">proc_flush_task </b>(</code></td><td>struct task_struct * <var class="pdparam">task</var><code>)</code>;</td></tr></table><div class="funcprototype-spacer"> </div></div></div><div class="refsect1" title="Arguments"><a id="id3119134"></a><h2>Arguments</h2><div class="variablelist"><dl><dt><span class="term"><em class="parameter"><code>task</code></em></span></dt><dd><p>
task that should be flushed.
</p></dd></dl></div></div><div class="refsect1" title="Description"><a id="id3119161"></a><h2>Description</h2><p>
When flushing dentries from proc, one needs to flush them from global
proc (proc_mnt) and from all the namespaces' procs this task was seen
in. This call is supposed to do all of this job.
</p><p>
Looks in the dcache for
/proc/<em class="parameter"><code>pid</code></em>
/proc/<em class="parameter"><code>tgid</code></em>/task/<em class="parameter"><code>pid</code></em>
if either directory is present flushes it and all of it'ts children
from the dcache.
</p><p>
It is safe and reasonable to cache /proc entries for a task until
that task exits. After that they just clog up the dcache with
useless entries, possibly causing useful dcache entries to be
flushed instead. This routine is proved to flush those useless
dcache entries at process exit time.
</p></div><div class="refsect1" title="NOTE"><a id="id3119204"></a><h2>NOTE</h2><p>
This routine is just an optimization so it does not guarantee
that no dcache entries will exist at process exit time it
just makes it very unlikely that any will persist.
</p></div></div><div class="navfooter"><hr /><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="ch02s02.html">Prev</a> </td><td width="20%" align="center"><a accesskey="u" href="ch02s02.html">Up</a></td><td width="40%" align="right"> <a accesskey="n" href="ch03.html">Next</a></td></tr><tr><td width="40%" align="left" valign="top">proc filesystem interface </td><td width="20%" align="center"><a accesskey="h" href="index.html">Home</a></td><td width="40%" align="right" valign="top"> Chapter 3. The Filesystem for Exporting Kernel Objects</td></tr></table></div></body></html>
