Date: Mon, 30 Mar 2009 12:58:53 +0800 From: David Xu <davidxu@freebsd.org> To: Julian Elischer <julian@elischer.org> Cc: Scott Long <scottl@samsco.org>, 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: <49D0518D.4040000@freebsd.org> In-Reply-To: <49D04F63.4010800@elischer.org> References: <11609492.9579.1238167614335.JavaMail.root@vms070.mailsrvcs.net> <49CD0405.1060704@samsco.org> <49CD30E9.7030501@elischer.org> <49CEC261.4010803@freebsd.org> <49CF0523.8020905@elischer.org> <49D022EF.8030305@freebsd.org> <49D023B7.8070402@freebsd.org> <49D04F63.4010800@elischer.org>
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Julian Elischer wrote: > David Xu wrote: >> David Xu wrote: >>> Julian Elischer wrote: >>> >>>> depends on the hardware. >>>> anyhow I was only saying it was possible, not necessarily >>>> good or even useful. >>>> >>>> >>> >>> I had done some works for thread private page shared by kernel >>> and userland when I was doing userland spinlock, if userland asks >>> a page, kernel will allocate it and put some interesting thing in >>> it by scheduler etcs, these code may be useful. >>> >> FYI: >> http://people.freebsd.org/~davidxu/schedctl/ > > reading this quickly, you allocate a separately addressed page for > each thread, but, how do you use it? > > I store the address in userland TLS area, then get it when I want to check some scheduling informations.
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