Date: Sat, 29 Oct 2005 00:29:10 -0700 From: Maxim Sobolev <sobomax@portaone.com> To: Poul-Henning Kamp <phk@phk.freebsd.dk> 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: <436324C6.5040107@portaone.com> In-Reply-To: <37497.1130570011@critter.freebsd.dk> References: <37497.1130570011@critter.freebsd.dk>
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Poul-Henning Kamp wrote: > 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 :-) Difference is that you won't have additional problems with userland and kernel versions mismatch and don't need any additional complexity associated with versioning/fallback logic. -Maxim
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