Date: Mon, 2 Mar 2015 12:26:46 -0800 From: Davide Italiano <davide@freebsd.org> To: John-Mark Gurney <jmg@freebsd.org> Cc: "svn-src-head@freebsd.org" <svn-src-head@freebsd.org>, "svn-src-all@freebsd.org" <svn-src-all@freebsd.org>, "src-committers@freebsd.org" <src-committers@freebsd.org> Subject: Re: svn commit: r279539 - head/sys/sys Message-ID: <CACYV=-FXuxzTqx12odFSRE98ydMd_AtK2GxKzv7bvLBbkAyr0A@mail.gmail.com> In-Reply-To: <201503022005.t22K5HTL062907@svn.freebsd.org> References: <201503022005.t22K5HTL062907@svn.freebsd.org>
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On Mon, Mar 2, 2015 at 12:05 PM, John-Mark Gurney <jmg@freebsd.org> wrote: > Author: jmg > Date: Mon Mar 2 20:05:16 2015 > New Revision: 279539 > URL: https://svnweb.freebsd.org/changeset/base/279539 > > Log: > give others fair warning that _SPARE2 isn't just cxgb, but used by large > number of other subsystems, so you probably don't want _SPARE2.. > > ktr needs an overhaul to really only compile in the ones you want, > we've long passed the 31 bits it provides.. > If you really want to do the overhaul (which would be honestly great), I might consider revamping my work for per-cpu KTR buffer and include that in the change. Originally it was just an exercise, but then it evolved and I've been sitting with it in my local tree for a while. I never had the chutzpah to upstream it because it involves fundamental changes and breaks compatibility with the old ktrdump(1) format. A rather outdated (and maybe not completely functional) version of the patch can be found here: http://people.freebsd.org/~davide/locking/ktr_percpu.4.diff , which should give you an high level view of the change. I can update it to the last version and bring up for review, if somebody think it might be a sane idea avoiding synchronization on a single buffer for KTR. -- Davide
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