Editing C dynamic memory allocation (section)

===In-kernel===
Operating system [[kernel (operating system)|kernels]] need to allocate memory just as application programs do. The implementation of <code>malloc</code> within a kernel often differs significantly from the implementations used by C libraries, however. For example, memory buffers might need to conform to special restrictions imposed by [[direct memory access|DMA]], or the memory allocation function might be called from interrupt context.<ref>{{cite web |url=http://people.netfilter.org/rusty/unreliable-guides/kernel-hacking/routines-kmalloc.html |title=kmalloc()/kfree() include/linux/slab.h |work=People.netfilter.org |access-date=18 September 2011 }}</ref> This necessitates a <code>malloc</code> implementation tightly integrated with the [[virtual memory]] subsystem of the operating system kernel.