From owner-freebsd-hackers@freebsd.org Sat Apr 21 20:30:12 2018 Return-Path: Delivered-To: freebsd-hackers@mailman.ysv.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mailman.ysv.freebsd.org (Postfix) with ESMTP id 2BB93FA0C06 for ; Sat, 21 Apr 2018 20:30:12 +0000 (UTC) (envelope-from 01000162e9e65aa9-50a58dbb-eaae-45fb-b6bb-20212b25d016-000000@amazonses.com) Received: from a8-60.smtp-out.amazonses.com (a8-60.smtp-out.amazonses.com [54.240.8.60]) (using TLSv1 with cipher ECDHE-RSA-AES128-SHA (128/128 bits)) (Client did not present a certificate) by mx1.freebsd.org (Postfix) with ESMTPS id C09176B7EE for ; Sat, 21 Apr 2018 20:30:11 +0000 (UTC) (envelope-from 01000162e9e65aa9-50a58dbb-eaae-45fb-b6bb-20212b25d016-000000@amazonses.com) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/simple; s=dqtolf56kk3wpt62c3jnwboqvr7iedax; d=tarsnap.com; t=1524342610; h=Subject:To:Cc:References:From:Message-ID:Date:MIME-Version:In-Reply-To:Content-Type:Content-Transfer-Encoding; bh=2L1qpCeO8+b6nM6X6LLObMUf/3ZLMOzqgBbVXfs+/Ts=; b=HBbZG9jZht38roP8WwDd2mXZzN7i9tGHVJSIzT12WyoqKatLzWlbjMuDDyLvPDUp yw6Vu+VGCcVaTMC74YwR+Uj5NoJf74tKrqk2vEsrlGkvzKumUPIsVzzoZorNcR1GWdq 8CTWNcZBSQLiN9GHQX2j0YTlV+RZOY5a4A4UCND8= DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/simple; s=ug7nbtf4gccmlpwj322ax3p6ow6yfsug; d=amazonses.com; t=1524342610; h=Subject:To:Cc:References:From:Message-ID:Date:MIME-Version:In-Reply-To:Content-Type:Content-Transfer-Encoding:Feedback-ID; bh=2L1qpCeO8+b6nM6X6LLObMUf/3ZLMOzqgBbVXfs+/Ts=; b=H6mnLG5VMOzQBgzi5crCreIMeRcCotjvDCcWraZ9bzJpBpEPtVk/DYBb6EoJoM81 8SD/PVOAeav0AjpD65QNaA0pucCgiG42YMKImvbdVkeZzNkwgirKp5xt/hUTiqVaIMA hMijung9UJNkZ0FjrWoKlJwhPWbXFZ51E2brui2g= Subject: Re: RFC: Hiding per-CPU kernel output behind bootverbose To: Warner Losh Cc: Konstantin Belousov , Conrad Meyer , "freebsd-hackers@freebsd.org" References: <01000162df15f856-1e5d2641-2a72-4250-8d8e-adcd47bc5db4-000000@email.amazonses.com> <20180419204405.GE6887@kib.kiev.ua> <20180419214550.GF6887@kib.kiev.ua> <01000162e58a4670-66a9983e-c3ef-493a-a60f-c477645b5100-000000@email.amazonses.com> From: Colin Percival Openpgp: preference=signencrypt Autocrypt: addr=cperciva@tarsnap.com; prefer-encrypt=mutual; keydata= xsDhBElrAAcRBACDfDys4ZtK+ErCJ1HAzYeteKpm3OEsvT/49AjUTLihkF79HhIKrCQU+1KC zv7BwHCMLb6hq30As9L7iFKG7n5QFLFC4Te/VcITUnWHMG/c3ViLOfJGvi+9/nOEHaM1dVJY D6tEp5yM1nHmVQpo9932j4KGuGFR0LhOK5IHXOSfGwCgxSFDPdgxe2OEjWxjGgY+oV3EafcD +JROXCTjlcQiG/OguQH4Vks3mhHfFnEppLxTkDuYgHZQiUtpcT9ssH5khgqoTyMar05OUdAj ZIhNbWDh4LgTj+7ZmvLhXT5Zxw8LX9d7T36aTB8XDQSenDqEtinMWOb0TCBBLbsB8EFG1WTT ESbZci9jJS5yhtktuZoY/eM8uXMD/3k4FWFO80VRRkELSp+XSy/VlSQjyi/rhl2nQq/oOA9F oJbDaB0yq9VNhxP+uFBzBWSqeIX0t1ZWLtNfVFr4TRP5hihI5ICrg/0OpqgisKsU2NFe9xyO hyJLYmfD8ebpDJ/9k30C7Iju9pVrwLm1QgS4S2fqJRcR+U4WbjvP7CgSzSVDb2xpbiBQZXJj aXZhbCA8Y3BlcmNpdmFAdGFyc25hcC5jb20+wmEEExECACEFAklrALYCGwMHCwkIBwMCAQQV AggDBBYCAwECHgECF4AACgkQOM7KaQxqam6/igCgn+z2k3V5ggNppmWrZstt1U2lugsAoL7L wS9V9yLtil3oWmHtwpUqYruEzsFNBElrAAcQCAD3ZLMIsP4CIDoJORg+YY0lqLVBgcnF7pFb 4Uy2+KvdWofN+DKH61rZLjgXXkNE9M4EQC1B4lGttBP8IY2gs41y3AUogGdyFbidq99rCBz7 LTsgARHwFxZoaHmXyiZLEU1QZuMqwPZV1mCviRhN5E3rRqYNXVcrnXAAuhBpvNyj/ntHvcDN 2/m+ochiuBYueU4kX3lHya7sOj+mTsndcWmQ9soOUyr8O0r/BG088bMn4qqtUw4dl5/pglXk jbl7uOOPinKf0WVd2r6M0wLPJCD4NPHrCWRLLLAjwfjrtoSRvXxDbXhCdgGBa72+K8eYLzVs hgq7tJOoBWzjVK6XRxR7AAMGB/9Mo3iJ2DxqDecd02KCB5BsFDICbJGhPltU7FwrtbC7djSb XUrwsEVLHi4st4cbdGNCWCrp0BRezXZKohKnNAPFOTK++ZfgeKxrV2sJod+Q9RILF86tQ4XF 7A7Yme5hy92t/WgiU4vc/fWbgP8gV/19f8nunaT2E9NSa70mZFjZNu4iuwThoUUO5CV3Wo0Y UISsnRK8XD1+LR3A2qVyLiFRwh/miC1hgLFCTGCQ3GLxZeZzIpYSlGdQJ0L5lixW5ZQD9r1I 8i/8zhE6qRFAM0upUMI3Gt1Oq2w03DiXrZU0Fu/R8Rm8rlnkQKA+95mRTUq1xL5P5NZIi4gJ Z569OPMFwkkEGBECAAkFAklrAAcCGwwACgkQOM7KaQxqam41igCfbaldnFTu5uAdrnrghESv EI3CAo8AoLkNMks1pThl2BJNRm4CtTK9xZeH Message-ID: <01000162e9e65aa9-50a58dbb-eaae-45fb-b6bb-20212b25d016-000000@email.amazonses.com> Date: Sat, 21 Apr 2018 20:30:10 +0000 User-Agent: Mozilla/5.0 (X11; FreeBSD amd64; rv:52.0) Gecko/20100101 Thunderbird/52.7.0 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 8bit X-SES-Outgoing: 2018.04.21-54.240.8.60 Feedback-ID: 1.us-east-1.Lv9FVjaNvvR5llaqfLoOVbo2VxOELl7cjN0AOyXnPlk=:AmazonSES X-BeenThere: freebsd-hackers@freebsd.org X-Mailman-Version: 2.1.25 Precedence: list List-Id: Technical Discussions relating to FreeBSD List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sat, 21 Apr 2018 20:30:12 -0000 On 04/21/18 10:02, Warner Losh wrote: > On Fri, Apr 20, 2018 at 6:11 PM, Colin Percival > wrote: > Would it be sufficient for debugging purposes if I change the !bootverbose > case from printing many lines of > > SMP: AP CPU #N Launched! > > to instead have a single > > SMP: Launching AP CPUs: 86 73 111 21 8 77 100 28 57 42 10 60 87 88 41 113 36 > 19 72 46 92 52 24 81 90 3 107 96 9 14 80 118 29 121 62 74 56 55 1 12 63 18 67 > 13 45 102 33 94 69 68 93 83 48 31 30 32 51 89 71 78 64 84 123 61 40 47 37 22 > 54 101 38 4 97 44 17 109 104 5 85 43 2 99 39 65 95 53 58 66 91 125 23 115 16 > 35 79 112 103 82 7 75 11 6 98 15 126 127 20 70 34 105 27 50 116 120 49 25 108 > 106 122 117 114 26 110 59 76 124 119 > > ?  (With each AP printing its number as it reaches the appropriate point?) > > This yields almost the same gain as silencing the launch messages completely, > while still allowing you to see each CPU announcing itself. > > The trouble is that you've got N CPUs that are doing output at the same time. > You'll need to synchronize somehow. And how do you know that the last one is > done? Especailly if one of the CPUs doesn't start.. Fortunately, this output is all generated with the ap_boot_mtx lock held. -- Colin Percival Security Officer Emeritus, FreeBSD | The power to serve Founder, Tarsnap | www.tarsnap.com | Online backups for the truly paranoid