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<html xmlns="http://www.w3.org/1999/xhtml"><head><meta http-equiv="Content-Type" content="text/html; charset=ANSI_X3.4-1968" /><title>rpc_malloc</title><meta name="generator" content="DocBook XSL Stylesheets V1.75.2" /><link rel="home" href="index.html" title="Linux Networking and Network Devices APIs" /><link rel="up" href="ch01s05.html" title="SUN RPC subsystem" /><link rel="prev" href="re159.html" title="rpc_wake_up_status" /><link rel="next" href="re161.html" title="rpc_free" /></head><body><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center"><span>rpc_malloc</span></th></tr><tr><td width="20%" align="left"><a accesskey="p" href="re159.html">Prev</a> </td><th width="60%" align="center">SUN RPC subsystem</th><td width="20%" align="right"> <a accesskey="n" href="re161.html">Next</a></td></tr></table><hr /></div><div class="refentry" title="rpc_malloc"><a id="API-rpc-malloc"></a><div class="titlepage"></div><div class="refnamediv"><h2>Name</h2><p>rpc_malloc —
allocate an RPC buffer
</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">rpc_malloc </b>(</code></td><td>struct rpc_task * <var class="pdparam">task</var>, </td></tr><tr><td> </td><td>size_t <var class="pdparam">size</var><code>)</code>;</td></tr></table><div class="funcprototype-spacer"> </div></div></div><div class="refsect1" title="Arguments"><a id="id2742352"></a><h2>Arguments</h2><div class="variablelist"><dl><dt><span class="term"><em class="parameter"><code>task</code></em></span></dt><dd><p>
RPC task that will use this buffer
</p></dd><dt><span class="term"><em class="parameter"><code>size</code></em></span></dt><dd><p>
requested byte size
</p></dd></dl></div></div><div class="refsect1" title="Description"><a id="id2742396"></a><h2>Description</h2><p>
To prevent rpciod from hanging, this allocator never sleeps,
returning NULL if the request cannot be serviced immediately.
The caller can arrange to sleep in a way that is safe for rpciod.
</p><p>
Most requests are 'small' (under 2KiB) and can be serviced from a
mempool, ensuring that NFS reads and writes can always proceed,
and that there is good locality of reference for these buffers.
</p><p>
In order to avoid memory starvation triggering more writebacks of
NFS requests, we avoid using GFP_KERNEL.
</p></div></div><div class="navfooter"><hr /><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="re159.html">Prev</a> </td><td width="20%" align="center"><a accesskey="u" href="ch01s05.html">Up</a></td><td width="40%" align="right"> <a accesskey="n" href="re161.html">Next</a></td></tr><tr><td width="40%" align="left" valign="top"><span>rpc_wake_up_status</span> </td><td width="20%" align="center"><a accesskey="h" href="index.html">Home</a></td><td width="40%" align="right" valign="top"> <span>rpc_free</span></td></tr></table></div></body></html>
