Date: Sun, 27 Aug 2017 08:51:09 -0700 From: Conrad Meyer <cem@freebsd.org> To: Ed Schouten <ed@nuxi.nl> Cc: src-committers <src-committers@freebsd.org>, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: Re: svn commit: r322942 - head/sys/kern Message-ID: <CAG6CVpWG9vS2wJsscRr2dOH=%2B_6HpXVRRqN1mrZffVfzbWsROw@mail.gmail.com> In-Reply-To: <CABh_MKknHyosfENq8SPzSOAhGFKL_tALfNdn5=eJqa29yjFqSA@mail.gmail.com> References: <201708270514.v7R5EmDK064785@repo.freebsd.org> <CABh_MKknHyosfENq8SPzSOAhGFKL_tALfNdn5=eJqa29yjFqSA@mail.gmail.com>
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On Sun, Aug 27, 2017 at 1:18 AM, Ed Schouten <ed@nuxi.nl> wrote: > Hi Conrad, > > [ Context: I don't understand anything about CPU topologies! ] > > 2017-08-27 7:14 GMT+02:00 Conrad Meyer <cem@freebsd.org>: >> + while (top->cg_children == 1) { >> + top = &top->cg_child[0]; >> + top->cg_parent = NULL; >> + } > > This only removes layers from the top if they only have a single > child. Question: is it possible/likely to have CPU topologies where > one of the middle layers only has one child? If so, would it make > sense to use tree traversal here to do the flattening? Hi Ed, It is probably possible for middle layers to have a single child, and your proposal is a good one. This is just the canned patch from Jeff I already had lying around :-). Best, Conrad
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