Date: Sat, 27 Jul 2013 17:47:52 +1000 (EST) From: Bruce Evans <brde@optusnet.com.au> To: Juli Mallett <jmallett@FreeBSD.org> Cc: svn-src-head@FreeBSD.org, Andrey Zonov <zont@FreeBSD.org>, src-committers@FreeBSD.org, svn-src-all@FreeBSD.org, Jilles Tjoelker <jilles@stack.nl> Subject: Re: svn commit: r253662 - in head: lib/libc/gen sys/vm tools/tools/sysdoc Message-ID: <20130727170845.E872@besplex.bde.org> In-Reply-To: <CACVs6=_gLGtW01-rmxTmaVgMBJWjpFHMEQ2R36Nvf2er7B4v%2Bw@mail.gmail.com> References: <201307260200.r6Q207cB015223@svn.freebsd.org> <20130726150949.GC14175@stack.nl> <51F2E970.3070303@FreeBSD.org> <CACVs6=_gLGtW01-rmxTmaVgMBJWjpFHMEQ2R36Nvf2er7B4v%2Bw@mail.gmail.com>
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On Fri, 26 Jul 2013, Juli Mallett wrote: > On Fri, Jul 26, 2013 at 2:26 PM, Andrey Zonov <zont@freebsd.org> wrote: > >> On 7/26/13 8:09 AM, Jilles Tjoelker wrote: >>> As noted in mail from Bruce Evans, please preserve the ABI of >>> VM_SWAPPING_ENABLED here. >> >> I don't think it's a big problem. Internally we don't use it. Good >> code uses sysctlbyname() instead of sysctl(). It doesn't seem to me >> this is very popular sysctl. It's also CURRENT without MFC. > > That doesn't seem like a great argument. > > Why should we break the ABI for bad code that used that sysctl and all > following? It seems pretty trivial to preserve, and no-cost. Also, the > fact that it's in current misses the point completely: it breaks ABI with > older binaries, namely older binaries running on -CURRENT. And not just > for that field. Especially since the main reason numbered sysctls exist is to support old binaries (and sources) that use them. Bruce
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