Date: Mon, 30 Mar 2009 17:24:36 -0700 From: Maxim Sobolev <sobomax@FreeBSD.org> To: Scott Long <scottl@samsco.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: <49D162C4.3050006@FreeBSD.org> In-Reply-To: <49CD0405.1060704@samsco.org> References: <11609492.9579.1238167614335.JavaMail.root@vms070.mailsrvcs.net> <49CD0405.1060704@samsco.org>
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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. I believe somebody suggested that no real VM magic is needed and the libc should be in charge of opening special pseudo-device and doing necessary mmap(2) magic to get the page mapped in when user calls gettimeofday()/getpid()/getid() etc for the first time. -Maxim
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