Date: Thu, 23 Mar 2017 11:03:49 +0800 From: Julian Elischer <julian@freebsd.org> To: Warner Losh <imp@bsdimp.com>, Allan Jude <allanjude@freebsd.org> Cc: "freebsd-hackers@freebsd.org" <freebsd-hackers@freebsd.org>, Saurav Sachidanand <sauravsachidanand@gmail.com> Subject: Re: [GSoC 2017] Original proposal: Port kernel Lua to FreeBSD Message-ID: <9db670f6-54d1-7862-bcd2-7c80df92e724@freebsd.org> In-Reply-To: <f221e624-1342-7548-a3f9-806a1d25b90d@freebsd.org> References: <CACKq%2BiX_V2MY9sNf-buEOO1S87dbhDv%2BPGbUEqRUVkvzz3pdvw@mail.gmail.com> <244231A2-EB18-4E58-A2B2-927F55D54950@FreeBSD.org> <CANCZdfpiiJLyLbEQnk86mfwf07JGByq5oT_1-T43iEhscEEgMg@mail.gmail.com> <f221e624-1342-7548-a3f9-806a1d25b90d@freebsd.org>
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On 1/3/17 4:14 pm, Julian Elischer wrote: > On 28/2/17 2:01 am, Warner Losh wrote: >> On Mon, Feb 27, 2017 at 8:26 AM, Allan Jude <allanjude@freebsd.org> >> wrote: >>> On February 27, 2017 5:28:41 AM PST, Saurav Sachidanand >>> <sauravsachidanand@gmail.com> wrote: >>>> Hello FreeBSD community, >>>> >>>> I'm >>>> Saurav Sachidanand, and I'm >>>> a CS sophomore studying in India >>>> . >>>> I have an interest in operating systems development and wish to >>>> contribute >>>> to the FreeBSD community. I'm proficient with C and have some >>>> experience in >>>> kernel programming. Hence, I'd like to propose an original >>>> project for >>>> GSoC >>>> 2017 that I feel would benefit this community. >>>> >>>> In past years, the Lua interpreter was ported to run inside the >>>> Linux >>>> and >>>> NetBSD kernel [1]. Lua was chosen because it's interpreter is very >>>> small (~240 >>>> KB) compared to that of Python or Ruby, it's MIT licensed, and is >>>> almost >>>> freestanding. A working demonstration of it is a packet filtering >>>> algorithm >>>> written entirely in kernel Lua [2]. >>>> >>>> Specifically, my proposal would be to port the following that are >>>> currently >>>> written for NetBSD: >>>> - the modified Lua VM source code with _KERNEL preprocessor >>>> directives >>>> to >>>> exclude user-space functionality like floating point, the io and os >>>> module >>>> in the standard library, etc. [3] >>>> - the kernel module device driver for /dev/lua, to which Lua scripts >>>> are >>>> fed to be executed [4], [5] >>>> - the luactl user-space program to control the Lua device and a >>>> couple >>>> of >>>> sysctl variables which serve similar purpose [6], [7] >>>> >>>> And then: >>>> - run the Lua test suite targeting whatever we support in the >>>> kernel to >>>> make sure it works [8] >>>> - and write Lua bindings to the kernel interfaces that would >>>> interest >>>> the >>>> FreeBSD community >>>> >>>> Since NetBSD and FreeBSD have similar kernel interfaces (mutexes, >>>> linked >>>> lists, device switch interface), the porting shouldn't involve >>>> too much >>>> code refactoring. Also, this would all be an experiment in that we >>>> don't >>>> fully know what the real world use cases might be, but it would >>>> attract >>>> more people to writing kernel code who otherwise wouldn't because of >>>> having >>>> to do everything in C. And it would be interesting to carry out >>>> it out >>>> in >>>> FreeBSD as well since it has a larger community than NetBSD. >>>> >>>> I humbly request anyone who is interested in this project to be my >>>> potential mentor(s) for GSoC. >>>> >>>> More slides on kernel Lua in NetBSD - [9], [10]. >>>> >>>> Thanks, >>>> Saurav >>>> >>>> [1] - http://www.netbsd.org/~lneto/dls14.pdf >>>> [2] - https://www.netbsd.org/~lneto/eurobsdcon14.pdf >>>> [3] - >>>> https://github.com/jsonn/src/tree/trunk/external/mit/lua/dist/src >>>> [4] - >>>> https://github.com/IIJ-NetBSD/netbsd-src/tree/master/sys/modules/lua >>>> [5] - >>>> https://github.com/IIJ-NetBSD/netbsd-src/tree/master/sys/modules/luasystm >>>> >>>> [6] - >>>> https://github.com/IIJ-NetBSD/netbsd-src/tree/master/sbin/luactl >>>> [7] - http://netbsd.gw.com/cgi-bin/man-cgi?lua+4+NetBSD-current >>>> [8] - http://www.lua.org/tests/ >>>> [9] - >>>> https://www.netbsd.org/gallery/presentations/mbalmer/fosdem2012/kernel_mode_lua.pdf >>>> >>>> [10] - https://www.lua.org/wshop13/Cormack.pdf >>>> _______________________________________________ >>>> freebsd-hackers@freebsd.org mailing list >>>> https://lists.freebsd.org/mailman/listinfo/freebsd-hackers >>>> To unsubscribe, send any mail to >>>> "freebsd-hackers-unsubscribe@freebsd.org" >>> This may be quite a nice thing to have. Another upcoming use for >>> LUA in the kernel is ZFS Channel Programs. These allow a number of >>> ZFS operations to be completed as a single atomic transaction. >>> >>> I would hope we could structure this in such a way as to not end >>> up with two copies of Lua in the kernel. >> There's also a 3/4 finished lua in the boot loader that you might be >> able to leverage as well.... > > I'd like to see that finished. While Devin has done Heroic work with > the forth in the loader, I think it's time has come. > It' be nice to have something a little less '60s. some news: Pedro Arthur who did the project just mailed me: =================== Hi, I've just finished getting the lua-bootloader code on top of HEAD, it should compile and run fine. The code can be found in [1]. [1] - https://github.com/grandao/freebsd/tree/projects/lua-bootloader =================== so it's up to date and we should look at it again > >> >> Warner >> _______________________________________________ >> freebsd-hackers@freebsd.org mailing list >> https://lists.freebsd.org/mailman/listinfo/freebsd-hackers >> To unsubscribe, send any mail to >> "freebsd-hackers-unsubscribe@freebsd.org" >> >
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