From owner-cvs-src@FreeBSD.ORG Sun Oct 15 14:22:14 2006 Return-Path: X-Original-To: cvs-src@FreeBSD.org Delivered-To: cvs-src@FreeBSD.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id AD15816A416; Sun, 15 Oct 2006 14:22:14 +0000 (UTC) (envelope-from netchild@FreeBSD.org) Received: from repoman.freebsd.org (repoman.freebsd.org [216.136.204.115]) by mx1.FreeBSD.org (Postfix) with ESMTP id 646C743D55; Sun, 15 Oct 2006 14:22:14 +0000 (GMT) (envelope-from netchild@FreeBSD.org) Received: from repoman.freebsd.org (localhost [127.0.0.1]) by repoman.freebsd.org (8.13.6/8.13.6) with ESMTP id k9FEMEcp081496; Sun, 15 Oct 2006 14:22:14 GMT (envelope-from netchild@repoman.freebsd.org) Received: (from netchild@localhost) by repoman.freebsd.org (8.13.6/8.13.4/Submit) id k9FEMEnI081495; Sun, 15 Oct 2006 14:22:14 GMT (envelope-from netchild) Message-Id: <200610151422.k9FEMEnI081495@repoman.freebsd.org> From: Alexander Leidinger Date: Sun, 15 Oct 2006 14:22:14 +0000 (UTC) To: src-committers@FreeBSD.org, cvs-src@FreeBSD.org, cvs-all@FreeBSD.org X-FreeBSD-CVS-Branch: HEAD Cc: Subject: cvs commit: src/sys/amd64/linux32 linux.h syscalls.master src/sys/compat/linux linux_aio.c linux_aio.h src/sys/conf files.amd64 files.i386 src/sys/i386/linux linux.h syscalls.master src/sys/kern vfs_aio.c src/sys/modules/aio Makefile ... X-BeenThere: cvs-src@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: CVS commit messages for the src tree List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sun, 15 Oct 2006 14:22:14 -0000 netchild 2006-10-15 14:22:14 UTC FreeBSD src repository Modified files: sys/amd64/linux32 linux.h syscalls.master sys/conf files.amd64 files.i386 sys/i386/linux linux.h syscalls.master sys/kern vfs_aio.c sys/modules/aio Makefile sys/modules/linux Makefile Added files: sys/compat/linux linux_aio.c linux_aio.h Log: MFP4 (with some minor changes): Implement the linux_io_* syscalls (AIO). They are only enabled if the native AIO code is available (either compiled in to the kernel or as a module) at the time the functions are used. If the AIO stuff is not available there will be a ENOSYS. From the submitter: ---snip--- DESIGN NOTES: 1. Linux permits a process to own multiple AIO queues (distinguished by "context"), but FreeBSD creates only one single AIO queue per process. My code maintains a request queue (STAILQ of queue(3)) per "context", and throws all AIO requests of all contexts owned by a process into the single FreeBSD per-process AIO queue. When the process calls io_destroy(2), io_getevents(2), io_submit(2) and io_cancel(2), my code can pick out requests owned by the specified context from the single FreeBSD per-process AIO queue according to the per-context request queues maintained by my code. 2. The request queue maintained by my code stores contrast information between Linux IO control blocks (struct linux_iocb) and FreeBSD IO control blocks (struct aiocb). FreeBSD IO control block actually exists in userland memory space, required by FreeBSD native aio_XXXXXX(2). 3. It is quite troubling that the function io_getevents() of libaio-0.3.105 needs to use Linux-specific "struct aio_ring", which is a partial mirror of context in user space. I would rather take the address of context in kernel as the context ID, but the io_getevents() of libaio forces me to take the address of the "ring" in user space as the context ID. To my surprise, one comment line in the file "io_getevents.c" of libaio-0.3.105 reads: Ben will hate me for this REFERENCE: 1. Linux kernel source code: http://www.kernel.org/pub/linux/kernel/v2.6/ (include/linux/aio_abi.h, fs/aio.c) 2. Linux manual pages: http://www.kernel.org/pub/linux/docs/manpages/ (io_setup(2), io_destroy(2), io_getevents(2), io_submit(2), io_cancel(2)) 3. Linux Scalability Effort: http://lse.sourceforge.net/io/aio.html The design notes: http://lse.sourceforge.net/io/aionotes.txt 4. The package libaio, both source and binary: http://rpmfind.net/linux/rpm2html/search.php?query=libaio Simple transparent interface to Linux AIO system calls. 5. Libaio-oracle: http://oss.oracle.com/projects/libaio-oracle/ POSIX AIO implementation based on Linux AIO system calls (depending on libaio). ---snip--- Submitted by: Li, Xiao Revision Changes Path 1.7 +2 -0 src/sys/amd64/linux32/linux.h 1.21 +5 -5 src/sys/amd64/linux32/syscalls.master 1.1 +1349 -0 src/sys/compat/linux/linux_aio.c (new) 1.1 +98 -0 src/sys/compat/linux/linux_aio.h (new) 1.95 +1 -0 src/sys/conf/files.amd64 1.567 +1 -0 src/sys/conf/files.i386 1.70 +2 -0 src/sys/i386/linux/linux.h 1.81 +5 -5 src/sys/i386/linux/syscalls.master 1.228 +4 -4 src/sys/kern/vfs_aio.c 1.2 +2 -0 src/sys/modules/aio/Makefile 1.69 +7 -5 src/sys/modules/linux/Makefile