Date: Fri, 27 Mar 2009 12:30:21 -0600 From: Scott Long <scottl@samsco.org> To: Robert Watson <rwatson@FreeBSD.org> Cc: Sergey Babkin <babkin@verizon.net>, freebsd-hackers@FreeBSD.org, attilio@FreeBSD.org, phk@phk.freebsd.dk, freebsd-current@FreeBSD.org, prashant.vaibhav@gmail.com Subject: Re: Improving the kernel/i386 timecounter performance (GSoC proposal) Message-ID: <49CD1B3D.3030103@samsco.org> In-Reply-To: <alpine.BSF.2.00.0903271821060.60642@fledge.watson.org> References: <11609492.9579.1238167614335.JavaMail.root@vms070.mailsrvcs.net> <49CD0405.1060704@samsco.org> <alpine.BSF.2.00.0903271821060.60642@fledge.watson.org>
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Robert Watson wrote: > > On Fri, 27 Mar 2009, Scott Long wrote: > >> I've been talking about this for years. All I need is help with the >> VM magic to create the page on fork. I also want two pages, one >> global for gettimeofday (and any other global data we can think of) >> and one per-process for static data like getpid/getgid. > > FWIW, there are some variations in schemes across OS's -- one extreme is > the Linux approach, which actually exports a mini shared library in ELF > format on the shared page, providing implementations of various services > (such as entering system calls), time stuff, etc. Less extreme are the > shared pages offered on Mac OS X, etc. > Yes, but I'd like to start somewhere, and considering that it's been impossible in _5_ years to get the 30 minutes of Peter or JeffR or JHB time to get the basic VM magic done, I'm keeping my expectations as modest as possible. Scott
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