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Diffstat (limited to 'man/sd_readahead.html')
| -rw-r--r-- | man/sd_readahead.html | 12 |
1 files changed, 6 insertions, 6 deletions
diff --git a/man/sd_readahead.html b/man/sd_readahead.html index 9e453e850e..5c6bef7453 100644 --- a/man/sd_readahead.html +++ b/man/sd_readahead.html @@ -19,7 +19,7 @@ <a href="systemd.directives.html">Directives </a>· <a href="../python-systemd/index.html">Python </a>· <a href="../libudev/index.html">libudev </a>· - <a href="../libudev/index.html">gudev </a><span style="float:right">systemd 204</span><hr><div class="refentry"><a name="sd_readahead"></a><div class="titlepage"></div><div class="refnamediv"><h2>Name</h2><p>sd_readahead — Control ongoing disk boot-time read-ahead operations</p></div><div class="refsynopsisdiv"><h2>Synopsis</h2><div class="funcsynopsis"><pre class="funcsynopsisinfo">#include "sd-readahead.h"</pre><table border="0" class="funcprototype-table" summary="Function synopsis" style="cellspacing: 0; cellpadding: 0;"><tr><td><code class="funcdef">int <b class="fsfunc">sd_readahead</b>(</code></td><td>const char *<var class="pdparam">action</var><code>)</code>;</td></tr></table><div class="funcprototype-spacer"> </div></div></div><div class="refsect1"><a name="idm259783404480"></a><h2 id="Description">Description<a class="headerlink" title="Permalink to this headline" href="#Description">¶</a></h2><p><code class="function">sd_readahead()</code> may be + <a href="../libudev/index.html">gudev </a><span style="float:right">systemd 208</span><hr><div class="refentry"><a name="sd_readahead"></a><div class="titlepage"></div><div class="refnamediv"><h2>Name</h2><p>sd_readahead — Control ongoing disk boot-time read-ahead operations</p></div><div class="refsynopsisdiv"><h2>Synopsis</h2><div class="funcsynopsis"><pre class="funcsynopsisinfo">#include "sd-readahead.h"</pre><table border="0" class="funcprototype-table" summary="Function synopsis" style="cellspacing: 0; cellpadding: 0;"><tr><td><code class="funcdef">int <b class="fsfunc">sd_readahead</b>(</code></td><td>const char *<var class="pdparam">action</var><code>)</code>;</td></tr></table><div class="funcprototype-spacer"> </div></div></div><div class="refsect1"><a name="idm274682558800"></a><h2 id="Description">Description<a class="headerlink" title="Permalink to this headline" href="#Description">¶</a></h2><p><code class="function">sd_readahead()</code> may be called by programs involved with early boot-up to control ongoing boot-time disk read-ahead operations. It may be used to terminate read-ahead operations in case an @@ -35,9 +35,9 @@ read-ahead data collected during this boot-up around for use during subsequent boot-ups.</p></dd><dt id="noreplay"><span class="term">noreplay</span><a class="headerlink" title="Permalink to this term" href="#noreplay">¶</a></dt><dd><p>Terminates read-ahead - replay.</p></dd></dl></div></div><div class="refsect1"><a name="idm259779561584"></a><h2 id="Return Value">Return Value<a class="headerlink" title="Permalink to this headline" href="#Return%20Value">¶</a></h2><p>On failure, these calls return a negative + replay.</p></dd></dl></div></div><div class="refsect1"><a name="idm274682550656"></a><h2 id="Return Value">Return Value<a class="headerlink" title="Permalink to this headline" href="#Return%20Value">¶</a></h2><p>On failure, these calls return a negative errno-style error code. It is generally recommended to - ignore the return value of this call.</p></div><div class="refsect1"><a name="idm259779560224"></a><h2 id="Notes">Notes<a class="headerlink" title="Permalink to this headline" href="#Notes">¶</a></h2><p>This function is provided by the reference + ignore the return value of this call.</p></div><div class="refsect1"><a name="idm274682549296"></a><h2 id="Notes">Notes<a class="headerlink" title="Permalink to this headline" href="#Notes">¶</a></h2><p>This function is provided by the reference implementation of APIs for controlling boot-time read-ahead and distributed with the systemd package. The algorithm it implements is simple, and @@ -56,15 +56,15 @@ recommended that applications consuming this API copy the implementation into their source tree. For more details about the reference implementation see - <a href="sd-readahead.html"><span class="citerefentry"><span class="refentrytitle">sd-readahead</span>(3)</span></a></p><p>If -DDISABLE_SYSTEMD is set during compilation + <a href="sd-readahead.html"><span class="citerefentry"><span class="refentrytitle">sd-readahead</span>(3)</span></a></p><p>If -DDISABLE_SYSTEMD is set during compilation, this function will always return 0 and otherwise - become a NOP.</p></div><div class="refsect1"><a name="idm259779552080"></a><h2 id="Examples">Examples<a class="headerlink" title="Permalink to this headline" href="#Examples">¶</a></h2><div class="example"><a name="idm259779551408"></a><p class="title"><b>Example 1. Cancelling all read-ahead operations</b></p><div class="example-contents"><p>During boots where SELinux has to + become a NOP.</p></div><div class="refsect1"><a name="idm274686496128"></a><h2 id="Examples">Examples<a class="headerlink" title="Permalink to this headline" href="#Examples">¶</a></h2><div class="example"><a name="idm274686495456"></a><p class="title"><b>Example 1. Cancelling all read-ahead operations</b></p><div class="example-contents"><p>During boots where SELinux has to relabel the file system hierarchy, it will create a large amount of disk accesses that are not necessary during normal boots. Hence it is a good idea to disable both read-ahead replay and read-ahead collection. </p><pre class="programlisting">sd_readahead("cancel"); -sd_readahead("noreplay");</pre></div></div><br class="example-break"></div><div class="refsect1"><a name="idm259783503488"></a><h2 id="See Also">See Also<a class="headerlink" title="Permalink to this headline" href="#See%20Also">¶</a></h2><p> +sd_readahead("noreplay");</pre></div></div><br class="example-break"></div><div class="refsect1"><a name="idm274686493088"></a><h2 id="See Also">See Also<a class="headerlink" title="Permalink to this headline" href="#See%20Also">¶</a></h2><p> <a href="systemd.html"><span class="citerefentry"><span class="refentrytitle">systemd</span>(1)</span></a>, <a href="sd-readahead.html"><span class="citerefentry"><span class="refentrytitle">sd-readahead</span>(3)</span></a>, <a href="daemon.html"><span class="citerefentry"><span class="refentrytitle">daemon</span>(7)</span></a> |