Date: Wed, 4 Jun 2014 06:51:32 +0400 From: Gleb Smirnoff <glebius@FreeBSD.org> To: David Chisnall <theraven@theravensnest.org> Cc: Yong-Hyeon Pyun <pyunyh@gmail.com>, Adrian Chadd <adrian@FreeBSD.org>, Marcel Moolenaar <marcel@freebsd.org>, "svn-src-all@freebsd.org" <svn-src-all@freebsd.org>, Marcel Moolenaar <marcel@xcllnt.net>, "src-committers@freebsd.org" <src-committers@freebsd.org>, "svn-src-head@freebsd.org" <svn-src-head@freebsd.org> Subject: Re: svn commit: r266974 - in head/sys: dev/dc dev/fxp dev/mii dev/netmap kern net Message-ID: <20140604025132.GD50679@FreeBSD.org> In-Reply-To: <D1E5E176-F7BD-4F13-8E09-6843038B162B@theravensnest.org> References: <201406021754.s52Hsd1B039620@svn.freebsd.org> <CAJ-VmonRqXrzrqQys_9s7-o8DFmOE_c_BZWupezm0i%2BW7E09vA@mail.gmail.com> <CAJ-VmonDJCLYWBPiz1ntFRm8aj4WQd5iHMKK0Wm3hcdjZmxghw@mail.gmail.com> <DA4CB2BA-A551-47A4-9E44-766FA29E2EF2@xcllnt.net> <20140603012939.GA2998@michelle.cdnetworks.com> <CAJ-Vmomt%2BHN7veD79a7h%2Bv9P4R6LdhAJpRB79yjwGd3H%2BdSpow@mail.gmail.com> <D1E5E176-F7BD-4F13-8E09-6843038B162B@theravensnest.org>
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On Tue, Jun 03, 2014 at 06:05:50PM +0100, David Chisnall wrote: D> On 3 Jun 2014, at 06:01, Adrian Chadd <adrian@FreeBSD.org> wrote: D> D> > I wonder if in the short term we should just use inlines for now, at D> > least so the methodization can get done without hurting people on D> > ARM/MIPS. D> D> It's probably worth thinking a bit more carefully about the KPI, since it's something we'll likely be stuck with for a long time... D> D> If access to a particular field is on the hot path, and you're never going to want to do interposition, then the obvious thing to do is have a method that returns a pointer to the field so that you can cache it in the caller. Some thought needs to be given there as to whether these things are _Atomic() qualified for when we (eventually) move to C11 for the kernel. Yes, this is the plan. Some high performance drivers can cache pointers to partial contents of an ifnet(9). -- Totus tuus, Glebius.
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