freebsd kernel with SKQ
c42b43a054
with cdev_pg_populate() to provide device drivers access to it. It gives drivers fine control of the pages ownership and allows drivers to implement arbitrary prefault policies. The populate method is called on a page fault and is supposed to populate the vm object with the page at the fault location and some amount of pages around it, at pager's discretion. VM provides the pager with the hints about current range of the object mapping, to avoid instantiation of immediately unused pages, if pager decides so. Also, VM passes the fault type and map entry protection to the pager, allowing it to force the optimal required ownership of the mapped pages. Installed pages must contiguously fill the returned region, be fully valid and exclusively busied. Of course, the pages must be compatible with the object' type. After populate() successfully returned, VM fault handler installs as many instantiated pages into the process page tables as it sees reasonable, while still obeying the correct semantic for COW and vm map locking. The method is opt-in, pager sets OBJ_POPULATE flag to indicate that the method can be called. If pager' vm objects can be shadowed, pager must implement the traditional getpages() method in addition to the populate(). Populate() might fall back to the getpages() on per-call basis as well, by returning VM_PAGER_BAD error code. For now for device pagers, the populate() method is only allowed to be used by the managed device pagers, but the limitation is only made because there is no unmanaged fault handlers which could use it right now. KPI designed together with, and reviewed by: alc Tested by: pho Sponsored by: The FreeBSD Foundation MFC after: 3 weeks |
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| bin | ||
| cddl | ||
| contrib | ||
| crypto | ||
| etc | ||
| gnu | ||
| include | ||
| kerberos5 | ||
| lib | ||
| libexec | ||
| release | ||
| rescue | ||
| sbin | ||
| secure | ||
| share | ||
| sys | ||
| targets | ||
| tests | ||
| tools | ||
| usr.bin | ||
| usr.sbin | ||
| .arcconfig | ||
| .arclint | ||
| COPYRIGHT | ||
| LOCKS | ||
| MAINTAINERS | ||
| Makefile | ||
| Makefile.inc1 | ||
| Makefile.libcompat | ||
| ObsoleteFiles.inc | ||
| README | ||
| UPDATING | ||
This is the top level of the FreeBSD source directory. This file was last revised on: $FreeBSD$ For copyright information, please see the file COPYRIGHT in this directory (additional copyright information also exists for some sources in this tree - please see the specific source directories for more information). The Makefile in this directory supports a number of targets for building components (or all) of the FreeBSD source tree. See build(7) and http://www.freebsd.org/doc/en_US.ISO8859-1/books/handbook/makeworld.html for more information, including setting make(1) variables. The `buildkernel` and `installkernel` targets build and install the kernel and the modules (see below). Please see the top of the Makefile in this directory for more information on the standard build targets and compile-time flags. Building a kernel is a somewhat more involved process. See build(7), config(8), and http://www.freebsd.org/doc/en_US.ISO8859-1/books/handbook/kernelconfig.html for more information. Note: If you want to build and install the kernel with the `buildkernel` and `installkernel` targets, you might need to build world before. More information is available in the handbook. The kernel configuration files reside in the sys/<arch>/conf sub-directory. GENERIC is the default configuration used in release builds. NOTES contains entries and documentation for all possible devices, not just those commonly used. Source Roadmap: --------------- bin System/user commands. cddl Various commands and libraries under the Common Development and Distribution License. contrib Packages contributed by 3rd parties. crypto Cryptography stuff (see crypto/README). etc Template files for /etc. gnu Various commands and libraries under the GNU Public License. Please see gnu/COPYING* for more information. include System include files. kerberos5 Kerberos5 (Heimdal) package. lib System libraries. libexec System daemons. release Release building Makefile & associated tools. rescue Build system for statically linked /rescue utilities. sbin System commands. secure Cryptographic libraries and commands. share Shared resources. sys Kernel sources. tests Regression tests which can be run by Kyua. See tests/README for additional information. tools Utilities for regression testing and miscellaneous tasks. usr.bin User commands. usr.sbin System administration commands. For information on synchronizing your source tree with one or more of the FreeBSD Project's development branches, please see: http://www.freebsd.org/doc/en_US.ISO8859-1/books/handbook/synching.html