Date: Fri, 1 Apr 2016 08:18:05 -0700 From: "Lundberg, Johannes" <johannes@brilliantservice.co.jp> To: Luigi Rizzo <rizzo@iet.unipi.it> Cc: Hans Petter Selasky <hp@selasky.org>, "freebsd-hackers@freebsd.org" <freebsd-hackers@freebsd.org> Subject: Re: Zero copy data transfer from Linuxulator to FreeBSD? Message-ID: <CAASDrV=x8NrnXJFf%2BXEMH8ikO6c1ANbpvzb-2qVnOMuHpqyjkA@mail.gmail.com> In-Reply-To: <CA%2BhQ2%2Bh2VMVFm-wCECt2VUdZFYaAvBVYTmM89zGLsRVeO-=qnA@mail.gmail.com> References: <CAASDrVncEFU1tXxjEf3PuNSb8uLMbj_dZw9CbH1_79hk79TDDQ@mail.gmail.com> <56FE2E87.9090806@selasky.org> <CAASDrVmwqdp5nFixwuyozbUbPZ7XbK2MvEvNAtZ5e3AjdCK=kg@mail.gmail.com> <CA%2BhQ2%2Bh2VMVFm-wCECt2VUdZFYaAvBVYTmM89zGLsRVeO-=qnA@mail.gmail.com>
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b2xlbHkgZm9yIHRoZSBhZGRyZXNzZWUuCkRpc2Nsb3N1cmUsIGNvcHlpbmcsIGRpc3RyaWJ1dGlv biBvciBhbnkgb3RoZXIgYWN0aW9uIG9mIHVzZSBvZiB0aGlzCmVtYWlsIGJ5IHBlcnNvbiBvdGhl ciB0aGFuIGludGVuZGVkIHJlY2lwaWVudCwgaXMgcHJvaGliaXRlZC4KSWYgeW91IGFyZSBub3Qg dGhlIGludGVuZGVkIHJlY2lwaWVudCBhbmQgaGF2ZSByZWNlaXZlZCB0aGlzIGVtYWlsIGluCmVy cm9yLCBwbGVhc2UgZGVzdHJveSB0aGUgb3JpZ2luYWwgbWVzc2FnZS4K From owner-freebsd-hackers@freebsd.org Fri Apr 1 15:43:06 2016 Return-Path: <owner-freebsd-hackers@freebsd.org> Delivered-To: freebsd-hackers@mailman.ysv.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:1900:2254:206a::19:1]) by mailman.ysv.freebsd.org (Postfix) with ESMTP id 6C095AEB46A for <freebsd-hackers@mailman.ysv.freebsd.org>; Fri, 1 Apr 2016 15:43:06 +0000 (UTC) (envelope-from jdavidlists@gmail.com) Received: from mail-ig0-x22a.google.com (mail-ig0-x22a.google.com [IPv6:2607:f8b0:4001:c05::22a]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (Client CN "smtp.gmail.com", Issuer "Google Internet Authority G2" (verified OK)) by mx1.freebsd.org (Postfix) with ESMTPS id 36AC21BFD; Fri, 1 Apr 2016 15:43:06 +0000 (UTC) (envelope-from jdavidlists@gmail.com) Received: by mail-ig0-x22a.google.com with SMTP id f1so4789069igr.1; Fri, 01 Apr 2016 08:43:06 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:sender:in-reply-to:references:date:message-id:subject :from:to:cc:content-transfer-encoding; bh=wEeO+kqqnrlztQHkjLrfO8KSRw9NALAqv4PnIAdcEVg=; b=FE6s9BeGGRSw+Gnq3q1Iam8CTyWWY6Y/Hy86RI6FNVeei1pE1+KpnI/dDRWoiAzUrp Iqq+tdIt5zuRv9fhRRC/zB8sE47QpabgfWigOJ+L3gnO/DPJWfudCfBlDlTJI4ecZPVf 0AsbYYcb5pxCZSeqwGQDJnu4bYaRGLY2qD8iwRqAw+tS1Mg8tlrSy3wBlGcfRz0t+tQt X+Loj0eVkkTnVw0hshwVmueLcRVkH7CQ74V1dQJ5vqKNGdBBqJpaSGzaqRcOLBeHdN3v wAt5XRstEIZhoe4iCG9Yhy0OnQD/8ZpBavxq/XECXUpYAGEomda9Wqycy63xtGqvgB7o D1cg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; 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<56FE13BA.4060500@FreeBSD.org> <9587.1459503159@critter.freebsd.dk> Date: Fri, 1 Apr 2016 11:43:05 -0400 X-Google-Sender-Auth: 5jX-uD0HZbKod2lyqSlIO8eONZ0 Message-ID: <CABXB=RQkSGn-hm9W17OdFG8HKPLM2+sa2bcyVhUS5vFUzZCNwA@mail.gmail.com> Subject: Re: Catching core files in read-only jails From: J David <j.david.lists@gmail.com> To: Poul-Henning Kamp <phk@phk.freebsd.dk> Cc: Matthew Seaman <matthew@freebsd.org>, "freebsd-hackers@freebsd.org" <freebsd-hackers@freebsd.org> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable X-BeenThere: freebsd-hackers@freebsd.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: Technical Discussions relating to FreeBSD <freebsd-hackers.freebsd.org> List-Unsubscribe: <https://lists.freebsd.org/mailman/options/freebsd-hackers>, <mailto:freebsd-hackers-request@freebsd.org?subject=unsubscribe> List-Archive: <http://lists.freebsd.org/pipermail/freebsd-hackers/>; List-Post: <mailto:freebsd-hackers@freebsd.org> List-Help: <mailto:freebsd-hackers-request@freebsd.org?subject=help> List-Subscribe: <https://lists.freebsd.org/mailman/listinfo/freebsd-hackers>, <mailto:freebsd-hackers-request@freebsd.org?subject=subscribe> X-List-Received-Date: Fri, 01 Apr 2016 15:43:06 -0000 On Fri, Apr 1, 2016 at 5:32 AM, Poul-Henning Kamp <phk@phk.freebsd.dk> wrot= e: > It would be really nice if instead of coredumps one could select to > just get a stack backtrace. Ah, yes, that would be great! Especially if it could automatically go into the dmesg or syslog. Or stderr for that matter. (That last would be kind of ugly, but we could make it work.) It looks like there=E2=80=99s a FreeBSD port of libsegfault now (https://github.com/stass/libsegfault ). Maybe we can wedge that in there as a medium-term solution. For the short term, we=E2=80=99ll try wedging a noexec tmpfs in there and s= ee if we can get what we need that way. Thanks for the suggestions!
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