Date: Sat, 29 Oct 2005 09:13:31 +0200 From: "Poul-Henning Kamp" <phk@phk.freebsd.dk> To: Maxim.Sobolev@portaone.com Cc: Pertti Kosunen <pertti.kosunen@pp.nic.fi>, Robert Watson <rwatson@FreeBSD.ORG>, David Xu <davidxu@FreeBSD.ORG>, "Yuriy N. Shkandybin" <jura@networks.ru>, current@FreeBSD.ORG Subject: Re: Timers and timing, was: MySQL Performance 6.0rc1 Message-ID: <37497.1130570011@critter.freebsd.dk> In-Reply-To: Your message of "Fri, 28 Oct 2005 16:54:32 PDT." <4362BA38.1090603@portaone.com>
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In message <4362BA38.1090603@portaone.com>, Maxim Sobolev writes: >You can solve most of those issues by exporting from kernel to userland >not only page(s) with actual data, but also page(s) with code to handle >that data. Then you can turn syscalls implementation in libc into plain >function calls to addresses in that code page(s). This approach can >potentially have other interesting applications, for example it will be >possible to use processor-specific syscalls instructions without >recompiling userland, move some of the ABI code into userland (i.e. >freebsd32 layer on amd64) etc. I'm not sure I see much difference between a shared library and this solution, but I'm equally sure we'd love to se a prototype before we judge it :-) -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 phk@FreeBSD.ORG | TCP/IP since RFC 956 FreeBSD committer | BSD since 4.3-tahoe Never attribute to malice what can adequately be explained by incompetence.
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