'\" t
.\"     Title: rpc_malloc
.\"    Author: [FIXME: author] [see http://docbook.sf.net/el/author]
.\" Generator: DocBook XSL Stylesheets v1.79.1 <http://docbook.sf.net/>
.\"      Date: January 2017
.\"    Manual: Linux Networking
.\"    Source: Kernel Hackers Manual 4.8.15
.\"  Language: English
.\"
.TH "RPC_MALLOC" "9" "January 2017" "Kernel Hackers Manual 4\&.8\&." "Linux Networking"
.\" -----------------------------------------------------------------
.\" * Define some portability stuff
.\" -----------------------------------------------------------------
.\" ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
.\" http://bugs.debian.org/507673
.\" http://lists.gnu.org/archive/html/groff/2009-02/msg00013.html
.\" ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
.ie \n(.g .ds Aq \(aq
.el       .ds Aq '
.\" -----------------------------------------------------------------
.\" * set default formatting
.\" -----------------------------------------------------------------
.\" disable hyphenation
.nh
.\" disable justification (adjust text to left margin only)
.ad l
.\" -----------------------------------------------------------------
.\" * MAIN CONTENT STARTS HERE *
.\" -----------------------------------------------------------------
.SH "NAME"
rpc_malloc \- allocate an RPC buffer
.SH "SYNOPSIS"
.HP \w'void\ *\ rpc_malloc('u
.BI "void * rpc_malloc(struct\ rpc_task\ *\ " "task" ", size_t\ " "size" ");"
.SH "ARGUMENTS"
.PP
\fItask\fR
.RS 4
RPC task that will use this buffer
.RE
.PP
\fIsize\fR
.RS 4
requested byte size
.RE
.SH "DESCRIPTION"
.PP
To prevent rpciod from hanging, this allocator never sleeps, returning NULL and suppressing warning if the request cannot be serviced immediately\&. The caller can arrange to sleep in a way that is safe for rpciod\&.
.PP
Most requests are \*(Aqsmall\*(Aq (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\&.
.PP
In order to avoid memory starvation triggering more writebacks of NFS requests, we avoid using GFP_KERNEL\&.
.SH "COPYRIGHT"
.br