1<html><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 V1.78.1"><link rel="home" href="index.html" title="Linux Filesystems API"><link rel="up" href="proc_filesystem_interface.html" title="proc filesystem interface"><link rel="prev" href="proc_filesystem_interface.html" title="proc filesystem interface"><link rel="next" href="fs_events.html" title="Chapter 3. Events based on file descriptors"></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">proc_flush_task</span></th></tr><tr><td width="20%" align="left"><a accesskey="p" href="proc_filesystem_interface.html">Prev</a> </td><th width="60%" align="center">proc filesystem interface</th><td width="20%" align="right"> <a accesskey="n" href="fs_events.html">Next</a></td></tr></table><hr></div><div class="refentry"><a name="API-proc-flush-task"></a><div class="titlepage"></div><div class="refnamediv"><h2>Name</h2><p>proc_flush_task — 2 Remove dcache entries for <em class="parameter"><code>task</code></em> from the /proc dcache. 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">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"><a name="idp1103100172"></a><h2>Arguments</h2><div class="variablelist"><dl class="variablelist"><dt><span class="term"><em class="parameter"><code>task</code></em></span></dt><dd><p> 4 task that should be flushed. 5 </p></dd></dl></div></div><div class="refsect1"><a name="idp1103101796"></a><h2>Description</h2><p> 6 When flushing dentries from proc, one needs to flush them from global 7 proc (proc_mnt) and from all the namespaces' procs this task was seen 8 in. This call is supposed to do all of this job. 9 </p><p> 10 11 Looks in the dcache for 12 /proc/<em class="parameter"><code>pid</code></em> 13 /proc/<em class="parameter"><code>tgid</code></em>/task/<em class="parameter"><code>pid</code></em> 14 if either directory is present flushes it and all of it'ts children 15 from the dcache. 16 </p><p> 17 18 It is safe and reasonable to cache /proc entries for a task until 19 that task exits. After that they just clog up the dcache with 20 useless entries, possibly causing useful dcache entries to be 21 flushed instead. This routine is proved to flush those useless 22 dcache entries at process exit time. 23</p></div><div class="refsect1"><a name="idp1103104380"></a><h2>NOTE</h2><p> 24 This routine is just an optimization so it does not guarantee 25 that no dcache entries will exist at process exit time it 26 just makes it very unlikely that any will persist. 27</p></div></div><div class="navfooter"><hr><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="proc_filesystem_interface.html">Prev</a> </td><td width="20%" align="center"><a accesskey="u" href="proc_filesystem_interface.html">Up</a></td><td width="40%" align="right"> <a accesskey="n" href="fs_events.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. Events based on file descriptors</td></tr></table></div></body></html> 28