Date: Fri, 11 Jul 2003 07:21:16 +1000 (EST) From: Bruce Evans <bde@zeta.org.au> To: Julian Elischer <julian@elischer.org> Cc: FreeBSD current users <current@freebsd.org> Subject: Re: small scheduler hack/patch Message-ID: <20030711070631.C27297@gamplex.bde.org> In-Reply-To: <Pine.BSF.4.21.0307101056420.40558-100000@InterJet.elischer.org> References: <Pine.BSF.4.21.0307101056420.40558-100000@InterJet.elischer.org>
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On Thu, 10 Jul 2003, Julian Elischer wrote: > I have a small "proof of concept" scheduler hack at: > http://www.freebsd.org/~julian/it.diff > ... > It's only implemented for SMP/i386 as the code to halt the cpu is only > present (from my quick view) in x86 and it doesn't make sense in UP.. ipi_selected() is essentially MI although it is declared in <machine/smp.h> and takes MD arg types, since it is used in subr_smp.c and subr_smp.c is MI by definition. Its second arg is u_int64_t on alphas, int on ia64's, and u_int on other arches. This isn't a problem since the arg is always a #define'd value like IPI_AST and these values have MD definitions. Its first arg has type u_int64_t on ia64's and u_int on other arches. This is bogus for ia64's since subr_smp.c uses u_int for all bitmaps of CPUs, so systems with more than 32 CPUs cannot actually work. Bruce
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