From owner-freebsd-hackers@freebsd.org Fri Apr 1 15:18:22 2016 Return-Path: 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 C3764AECB5F for ; Fri, 1 Apr 2016 15:18:22 +0000 (UTC) (envelope-from johannes@brilliantservice.co.jp) Received: from mail-yw0-x22c.google.com (mail-yw0-x22c.google.com [IPv6:2607:f8b0:4002:c05::22c]) (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 897851EA6 for ; Fri, 1 Apr 2016 15:18:22 +0000 (UTC) (envelope-from johannes@brilliantservice.co.jp) Received: by mail-yw0-x22c.google.com with SMTP id g127so166185923ywf.2 for ; Fri, 01 Apr 2016 08:18:22 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=brilliantservice-co-jp.20150623.gappssmtp.com; s=20150623; h=mime-version:in-reply-to:references:from:date:message-id:subject:to :cc; bh=L8ZIUJ2Qnd2qjq9aKXDYN5fClLXCrHn4BLcVJc9DlBU=; b=JRnkUFQsvs2X/6jVEjMt7m8q+chkqMcznMayGT4MYNNXehgHNc5bNPBZZ+Wa6ZVJWM Go7eND9RFjouZbnRDlD4UvkYSp3llpvqlGQi1bnScI0lQmcVl7f0ul0fFUMN9GbAWeRV vOBEq1hHEhDSdw12S1mD6lIdTkcQ4DqmnzwnXALb59U2TkQ/WudbQARoHpPNMLF4+L8u 9NlE0xfxFIA8peXSVOqryDfFSzmRDBswnFQGoA+TA1G6EOhMTi3jbyzNTqgRCfHRGxB1 jTJyCweWU1lWnjPKpFfRDqfbuNK08cHv17iJrWU/gXBBEYk1subV/JD8aA+/qU1RKGWm YvdA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; h=x-gm-message-state:mime-version:in-reply-to:references:from:date :message-id:subject:to:cc; bh=L8ZIUJ2Qnd2qjq9aKXDYN5fClLXCrHn4BLcVJc9DlBU=; b=akkFfQiAnHvXWF8uXlb/IsMGhUrWFeqqQOHdXyCEo9vXGV7RA5vxqFoAW96MiCavXq ZUixJTvV2RTETdZZIPXhPl8bU+nWspIJGiV41+Ch2e86SQcpPcpJFZtA1lBD/VJsWf6K 873l+wFuZ3+hGPNXIfMu5bczTLrip8GeHKnTWQ/uz+9co+7pVuMuqpFe9wTPBQFFty6U GRU6N6r15lu1MZV7yI7ns0aEJxP97jDfqBLeVCwaNhYAtW+VbOllMHCepziwtCiclEr5 MswmFz07mOIJFG1cpztINpik1Dd7SyXo2hPW2xgloiJKtYGjLx+Wsd5vNmSrGAqD8IQn /+Hg== X-Gm-Message-State: AD7BkJKGNP7Nx4axaranBKRxPNhPQS2vd+jUK7q5cQ9YZhS2ZeYqNB2LFNQ5XRwRy3zZZuHYUI2doVfaj7lKUwGdpOiPJGa5rpCs2FtuzYePfg3oYJ94LcV3OnWnVlcbBGmyJbsvQ2L4qkXMlu3BYHSElR0= X-Received: by 10.37.97.148 with SMTP id v142mr6012317ybb.71.1459523900167; Fri, 01 Apr 2016 08:18:20 -0700 (PDT) MIME-Version: 1.0 Received: by 10.129.145.11 with HTTP; Fri, 1 Apr 2016 08:18:05 -0700 (PDT) In-Reply-To: References: <56FE2E87.9090806@selasky.org> From: "Lundberg, Johannes" Date: Fri, 1 Apr 2016 08:18:05 -0700 Message-ID: Subject: Re: Zero copy data transfer from Linuxulator to FreeBSD? To: Luigi Rizzo Cc: Hans Petter Selasky , "freebsd-hackers@freebsd.org" Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: base64 X-Content-Filtered-By: Mailman/MimeDel 2.1.21 X-BeenThere: freebsd-hackers@freebsd.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: Technical Discussions relating to FreeBSD List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 01 Apr 2016 15:18:22 -0000 SGkgTHVpZ2kNCg0KU2luY2UgdGhpcyBpcyBhbiBlbWJlZGRlZCBkZXZpY2UgcnVubmluZyBvbiBi YXR0ZXJ5IGV2ZXJ5IGJpdCBjb3VudHMuDQpIb3dldmVyLCB0aGlzIGlzIGtpbmQgb2YgYSB0ZW1w b3Jhcnkgc29sdXRpb24gc28gSSdtIGNvbnNpZGVyaW5nIGFjY2VwdGluZw0KaXQuLg0KDQpBdCBh bnkgcmF0ZSwgSSBhbSBnZW5lcmFsbHkgY3VyaW91cyB3aGF0IG1lY2hhbmlzbSB0aGVyZSBhcmUg Zm9yDQp0cmFuc2ZlcnJpbmcgZGF0YSBiZXR3ZWVuIExpbnV4IGFuZCBuYXRpdmUgcHJvY2VzcyBp biBGcmVlQlNELi4NCg0KDQpPbiBGcmksIEFwciAxLCAyMDE2IGF0IDg6MTAgQU0sIEx1aWdpIFJp enpvIDxyaXp6b0BpZXQudW5pcGkuaXQ+IHdyb3RlOg0KDQo+DQo+DQo+IE9uIEZyaSwgQXByIDEs 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(mx1.freebsd.org [IPv6:2001:1900:2254:206a::19:1]) by mailman.ysv.freebsd.org (Postfix) with ESMTP id 6C095AEB46A for ; 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 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AD7BkJKnbhOTjsP5PDRxCCySqS2jWUOeV8uENzONTPuC/6ExOZJOQBca8NPCqeFh0DFXX/rnGfkkoG+8UYWA2w== MIME-Version: 1.0 X-Received: by 10.50.65.8 with SMTP id t8mr4381908igs.60.1459525385550; Fri, 01 Apr 2016 08:43:05 -0700 (PDT) Sender: jdavidlists@gmail.com Received: by 10.36.130.130 with HTTP; Fri, 1 Apr 2016 08:43:05 -0700 (PDT) In-Reply-To: <9587.1459503159@critter.freebsd.dk> References: <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: Subject: Re: Catching core files in read-only jails From: J David To: Poul-Henning Kamp Cc: Matthew Seaman , "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 List-Unsubscribe: , List-Archive: List-Post: List-Help: List-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 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!