Date: Wed, 24 Apr 2002 07:14:42 -0700 (PDT) From: paleph@pacbell.net To: freebsd-hackers@Freebsd.org Subject: question on use of kernel memory allocation routines Message-ID: <200204241414.g3OEEhB02234@pacbell.net>
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I have a few questions on the kernel memory allocation
available in the FreeBSD kernel and also on the
process of adding new system calls.
I working on adding an audit subsystem to the kernel
to support C2 auditing.
I have two questions:
--------------------------------
1. What is the correct (standard) way to add a new
system call to the kernel so it will be
compatible with 4.* and 5.* ?
--------------------------------
2. I notice a large number of memory allocation routines that
are used through out the kernel. I tried looking at the
FreeBSD archives and also did a google search to see what
I could find about their semantics. I did not have very good
success. The kernel file comments with these interfaces were
not very helpful in determining when they should be used.
Is there any documentation on them and when they should be
used. I could probably get away with just using malloc() and
free(), however it would be nice to understand what these
memory allocation functions do in case they are more appropriate.
======== taken from vm/vm_kern.c ========
vm_offset_t
kmem_alloc_pageable(map, size)
vm_offset_t
kmem_alloc_nofault(map, size)
vm_offset_t
kmem_alloc(map, size)
void
kmem_free(map, addr, size)
vm_map_t
kmem_suballoc(parent, min, max, size)
vm_offset_t
kmem_malloc(map, size, flags)
vm_offset_t
kmem_alloc_wait(map, size)
void
kmem_free_wakeup(map, addr, size)
void
kmem_init(start, end)
vm_offset_t start, end;
======= taken from kern/kern_malloc.c ======
void *
malloc(size, type, flags)
void
free(addr, type)
----------------------------------
Any help or pointers to documentation is appreciated
Paul Fronberg
paleph@pacbell.net
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