Date: Mon, 07 Jun 2010 11:26:43 +0300 From: Alexander Motin <mav@FreeBSD.org> To: Ed Schouten <ed@80386.nl> Cc: FreeBSD-Current <freebsd-current@freebsd.org>, freebsd-arch@freebsd.org Subject: Re: RFC: New event timers infrastructure Message-ID: <4C0CAD43.20102@FreeBSD.org> In-Reply-To: <20100607081356.GY56080@hoeg.nl> References: <4C0C1AE4.8050807@FreeBSD.org> <20100607081356.GY56080@hoeg.nl>
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Ed Schouten wrote: > * Alexander Motin <mav@FreeBSD.org> wrote: >> Most of x86 systems now has at least 4 types of event timers: i8254, >> RTC, LAPIC and HPET. Respective code in kernel is very tangled, heavily >> hardcoded and absolutely not scalable. I have reimplemented it, trying >> to solve these issues. > > Just out of curiosity, how does this work relate to things like having a > tickless kernel? It is almost mandatory prerequisite. We can't do any fancy timer stuff without unified timer API. Tsuyoshi Ozawa in his Dynamic Ticks work also got to the same conclusion, but he was much less aggressive in rewriting legacy code. -- Alexander Motin
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