Date: Mon, 3 Mar 2008 16:42:45 -1000 (HST) From: Jeff Roberson <jroberson@chesapeake.net> To: David Xu <davidxu@FreeBSD.org> Cc: cvs-src@FreeBSD.org, Jeff Roberson <jeff@FreeBSD.org>, src-committers@FreeBSD.org, cvs-all@FreeBSD.org Subject: Re: cvs commit: src/sys/kern init_sysent.c syscalls.c systrace_args.c src/sys/sys syscall.h syscall.mk sysproto.h Message-ID: <20080303164227.S920@desktop> In-Reply-To: <47CCAF49.20903@freebsd.org> References: <200803020741.m227fAoJ039644@repoman.freebsd.org> <47CB6FB0.9040602@freebsd.org> <20080302183513.P920@desktop> <47CCAF49.20903@freebsd.org>
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On Tue, 4 Mar 2008, David Xu wrote: > Jeff Roberson wrote: > >>> One question is how I can determine the size of cpuset the kernel is >>> using ? >> >> I wrote it to tolerate user masks that were much larger than the kernel >> mask. I set the default CPU_SETSIZE in userspace to 128 and in kernel it's >> MAXCPU. So in practice an application shouldn't have to redefine >> CPU_SETSIZE. If your set is too small the kernel will return ERANGE >> however. Unfortunately, if your set is larger than the kernel's >> CPU_MAXSIZE it'll also return ERANGE. Maybe I should use different errnos >> for those cases. >> > > From my point, userland has to write some urgly code to guess what > kernel code wants, it is rather frustrate. You can use sysctl kern.smp.maxcpus to get the precise size. > > > > > > > >
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