Date: Sat, 19 Feb 2011 14:35:30 +0100 From: Gary Jennejohn <gljennjohn@googlemail.com> To: "Steven Hartland" <killing@multiplay.co.uk> Cc: freebsd-hackers@freebsd.org, freebsd-stable@freebsd.org Subject: Re: machdep.hlt_cpus not safe with ULE? Message-ID: <20110219143530.45d0f958@ernst.jennejohn.org> In-Reply-To: <8332E9240ECA403480B48D21FA3A8694@multiplay.co.uk> References: <8332E9240ECA403480B48D21FA3A8694@multiplay.co.uk>
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On Sat, 19 Feb 2011 12:36:57 -0000 "Steven Hartland" <killing@multiplay.co.uk> wrote: > I'm trying to debug a possibly failing CPU, so I thought it would > be easy just disable the cores using machdep.hlt_cpus and see if > we see the panic's we've been seeing. > > The problem is it seems ULE doesnt properly support machdep.hlt_cpus > and still schedules processes onto the halted cpus which obviously > causes problems. > > Can anyone confirm this behaviour? Should machdep.hlt_cpus and I assume > the logical counterpart never be used with ULE? > Looking at the kernel source it appears that only sched_4bsd.c makes use of hlt_cpus_mask. -- Gary Jennejohn
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