Date: Mon, 30 Mar 2009 13:05:35 +0800 From: David Xu <davidxu@freebsd.org> To: Julian Elischer <julian@elischer.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: <49D0531F.1000005@freebsd.org> In-Reply-To: <49D05292.30701@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> <49D0518D.4040000@freebsd.org> <49D05292.30701@elischer.org>
next in thread | previous in thread | raw e-mail | index | archive | help
Julian Elischer wrote: > David Xu wrote: >> 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. > > and the scheduler writes out interesting information to that > location?... > > Yes.
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?49D0531F.1000005>