John Baldwin 936c09ac0f Add the posix_fadvise(2) system call. It is somewhat similar to ... madvise(2) except that it operates on a file descriptor instead of a memory region. It is currently only supported on regular files. Just as with madvise(2), the advice given to posix_fadvise(2) can be divided into two types. The first type provide hints about data access patterns and are used in the file read and write routines to modify the I/O flags passed down to VOP_READ() and VOP_WRITE(). These modes are thus filesystem independent. Note that to ease implementation (and since this API is only advisory anyway), only a single non-normal range is allowed per file descriptor. The second type of hints are used to hint to the OS that data will or will not be used. These hints are implemented via a new VOP_ADVISE(). A default implementation is provided which does nothing for the WILLNEED request and attempts to move any clean pages to the cache page queue for the DONTNEED request. This latter case required two other changes. First, a new V_CLEANONLY flag was added to vinvalbuf(). This requests vinvalbuf() to only flush clean buffers for the vnode from the buffer cache and to not remove any backing pages from the vnode. This is used to ensure clean pages are not wired into the buffer cache before attempting to move them to the cache page queue. The second change adds a new vm_object_page_cache() method. This method is somewhat similar to vm_object_page_remove() except that instead of freeing each page in the specified range, it attempts to move clean pages to the cache queue if possible. To preserve the ABI of struct file, the f_cdevpriv pointer is now reused in a union to point to the currently active advice region if one is present for regular files. Reviewed by: jilles, kib, arch@ Approved by: re (kib) MFC after: 1 month		2011-11-04 04:02:50 +00:00
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freebsd32_ioctl.c	In order to maximize the re-usability of kernel code in user space this	2011-09-16 13:58:51 +00:00
freebsd32_ioctl.h	Provide the structures and ioctl number definition for handling	2011-04-02 15:47:23 +00:00
freebsd32_ipc.h	Move SysV IPC freebsd32 compat shims helpers from freebsd32_misc.c to	2010-03-19 11:01:51 +00:00
freebsd32_misc.c	Add the posix_fadvise(2) system call. It is somewhat similar to	2011-11-04 04:02:50 +00:00
freebsd32_proto.h	Regen.	2011-10-14 11:47:14 +00:00
freebsd32_signal.h	Constify source argument for siginfo_to_siginfo32().	2010-07-04 11:43:53 +00:00
freebsd32_syscall.h	Regen.	2011-10-14 11:47:14 +00:00
freebsd32_syscalls.c	Regen.	2011-10-14 11:47:14 +00:00
freebsd32_sysent.c	Regen.	2011-10-14 11:47:14 +00:00
freebsd32_systrace_args.c	Regen.	2011-10-14 11:47:14 +00:00
freebsd32_util.h	In order to maximize the re-usability of kernel code in user space this	2011-09-16 13:58:51 +00:00
freebsd32.h	Rename ki_ocomm to ki_tdname and OCOMMLEN to TDNAMLEN.	2011-07-18 20:06:15 +00:00
Makefile	add DTrace systrace support for linux32 and freebsd32 on amd64 syscalls	2011-03-12 08:51:43 +00:00
syscalls.conf	add DTrace systrace support for linux32 and freebsd32 on amd64 syscalls	2011-03-12 08:51:43 +00:00
syscalls.master	Add the posix_fadvise(2) system call. It is somewhat similar to	2011-11-04 04:02:50 +00:00