1<html><head><meta http-equiv="Content-Type" content="text/html; charset=ANSI_X3.4-1968"><title>synchronize_rcu_expedited</title><meta name="generator" content="DocBook XSL Stylesheets V1.78.1"><link rel="home" href="index.html" title="Linux Device Drivers"><link rel="up" href="ch01s09.html" title="Kernel utility functions"><link rel="prev" href="API-synchronize-rcu.html" title="synchronize_rcu"><link rel="next" href="API-rcu-barrier.html" title="rcu_barrier"></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">synchronize_rcu_expedited</span></th></tr><tr><td width="20%" align="left"><a accesskey="p" href="API-synchronize-rcu.html">Prev</a>&#160;</td><th width="60%" align="center">Kernel utility functions</th><td width="20%" align="right">&#160;<a accesskey="n" href="API-rcu-barrier.html">Next</a></td></tr></table><hr></div><div class="refentry"><a name="API-synchronize-rcu-expedited"></a><div class="titlepage"></div><div class="refnamediv"><h2>Name</h2><p>synchronize_rcu_expedited &#8212; 
2     Brute-force RCU grace period
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">synchronize_rcu_expedited </b>(</code></td><td> <var class="pdparam">void</var><code>)</code>;</td></tr></table><div class="funcprototype-spacer">&#160;</div></div></div><div class="refsect1"><a name="idp1108694452"></a><h2>Arguments</h2><div class="variablelist"><dl class="variablelist"><dt><span class="term"><em class="parameter"><code>void</code></em></span></dt><dd><p>
4     no arguments
5    </p></dd></dl></div></div><div class="refsect1"><a name="idp1108696060"></a><h2>Description</h2><p>
6   </p><p>
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8   Wait for an RCU-preempt grace period, but expedite it.  The basic
9   idea is to invoke <code class="function">synchronize_sched_expedited</code> to push all the tasks to
10   the -&gt;blkd_tasks lists and wait for this list to drain.  This consumes
11   significant time on all CPUs and is unfriendly to real-time workloads,
12   so is thus not recommended for any sort of common-case code.
13   In fact, if you are using <code class="function">synchronize_rcu_expedited</code> in a loop,
14   please restructure your code to batch your updates, and then Use a
15   single <code class="function">synchronize_rcu</code> instead.
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