From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <linux-kernel-owner@vger.kernel.org>
Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand
	id S933822AbcFQPT5 (ORCPT <rfc822;w@1wt.eu>);
	Fri, 17 Jun 2016 11:19:57 -0400
Received: from mout.web.de ([212.227.15.4]:55340 "EHLO mout.web.de"
	rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP
	id S933647AbcFQPTx (ORCPT <rfc822;linux-kernel@vger.kernel.org>);
	Fri, 17 Jun 2016 11:19:53 -0400
Subject: Re: [Cocci] [PATCH v2 4/8] scripts: add glimpse.sh for indexing the
 kernel
To: Julia Lawall <julia.lawall@lip6.fr>
References: <1466116292-21843-1-git-send-email-mcgrof@kernel.org>
 <1466116292-21843-5-git-send-email-mcgrof@kernel.org>
 <alpine.DEB.2.10.1606171129200.3164@hadrien>
From: SF Markus Elfring <elfring@users.sourceforge.net>
Cc: cocci@systeme.lip6.fr, linux-kernel@vger.kernel.org,
        Andrew Morton <akpm@linux-foundation.org>,
        Christian Lamparter <chunkeey@googlemail.com>,
        David Woodhouse <dwmw2@infradead.org>,
        Dmitry Torokhov <dmitry.torokhov@gmail.com>,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        Hauke Mehrtens <hauke@hauke-m.de>, Jiri Slaby <jslaby@suse.com>,
        Johannes Berg <johannes@sipsolutions.net>,
        Josh Boyer <jwboyer@fedoraproject.org>,
        Linus Torvalds <torvalds@linux-foundation.org>,
        "Luis R. Rodriguez" <mcgrof@kernel.org>,
        Mark Brown <broonie@kernel.org>, Michal Marek <mmarek@suse.com>,
        Mimi Zohar <zohar@linux.vnet.ibm.com>,
        Ming Lei <ming.lei@canonical.com>,
        Stephen Boyd <stephen.boyd@linaro.org>, Takashi Iwai <tiwai@suse.de>,
        Vikram Mulukutla <markivx@codeaurora.org>
Message-ID: <477f1f1d-f60f-79b9-1f0f-f9cb030c240a@users.sourceforge.net>
Date: Fri, 17 Jun 2016 17:18:37 +0200
User-Agent: Mozilla/5.0 (Windows NT 10.0; WOW64; rv:45.0) Gecko/20100101
 Thunderbird/45.1.1
MIME-Version: 1.0
In-Reply-To: <alpine.DEB.2.10.1606171129200.3164@hadrien>
Content-Type: text/plain; charset=windows-1252
Content-Transfer-Encoding: 7bit
X-Provags-ID: V03:K0:ODcwoB/vz5Z2Dmfyie1wj63SFDkBMayWb7GXr8WVPYqdc4i0uI6
 M6dlPunHz6HUVd0164nnfE+cxZ8m7Ik76o/65uqhhqColO5zsFB/7bVepEAmLyfTgSwaezx
 7n1gotk65N6g85EFnHynd3T8HKJY7EtgRs8AkPpDwwG54zysfAe5QSzmcXqVuUHcNqh80Jd
 eqZM6+wswF6SOwbe6soIw==
X-UI-Out-Filterresults: notjunk:1;V01:K0:G413D0BabUo=:spBER0hKQjzxt27oX68erz
 qtDeWUFzHqGdiKpu+WJOX9ftMFbBBMUKwY4mJJvuo/hXeQppv9H0aEGibjDqytIcOxiNHbrE+
 o4IJVJcIU9+d5XqeLCuvtTud8zFrICSEXC0bnNAyBkdJC6BJS549PdCmkDLrB0FJ4jgJ9cpcl
 IEdlVYdilTGw+4X9Jhjn3j4xyhZr6Sa0VS60TVmKoTVUTT20ivvZAQwBxZOhSD3Vae+CUFqVC
 xUbEGifpipOo7Ouvgj1YuqGmWA8pzFog/4nRq6DYzFj8vi9bASSNQgZY9cQ0xTL9uNddQgmcH
 shlvu/kAsvYemJ3YDrraukCXE0kM2wYDuTC7tkBhYLhxqVI7Lvu9B2OTFMi83BeGNeNlLfEzS
 OK8saxQbjqHTpNuESpSQt/O2tjTEdEtdUPDXxO9LJxxvZAwWv2ekBYRGNTCMP1RT9f9IjrCT0
 /lF84ta0scV6n+nHYV+bsZvQuDzYZSS+9F3jVSgIiFf7Uc5PLHA76xfxJHtWZtyizVUvQGGET
 PiWPimgwPQ4aQl5gp3RkNmIlfxqPR6bSsTiE+pyvJnym2a6ybaaXUAUI14cW78rZbInZdYk7O
 d0RTYc1Enopt2pv1VYtgsl9vyKBB4ZDFUOrOLbZg72aGO+KR5NoiwWxyDgB5qLTfsH0FwMLBE
 8IjmPcR9t+3ciMbdhRBldnGz4CqPPXPDBiBVRf+xi82A8/oUwbkRKL9djXPEfL5jWwrLZVlQJ
 y0IMjbbhhvIhWDz0q/Zyt8kCK99GaQDJH+kwS57LTpTcvd/mR3TXo4OQKHtRpoiFd+1ACMUJF
 IuqEt5y
Sender: linux-kernel-owner@vger.kernel.org
List-ID: <linux-kernel.vger.kernel.org>
X-Mailing-List: linux-kernel@vger.kernel.org

> I'm not sure that this is worth it.  It adds a dependency on a tool
> that seems not to be well maintained.

Would any developers like to achieve further software improvements by
additional means?
How are the chances for corresponding progress from an approach like in
a repository by Luis?
https://github.com/mcgrof/glimpse


> In terms of Coccinelle, I'm not sure that it gives a big benefit.

Under which circumstances will the indexing efforts pay off?


> Attached is a graph showing the file selection time for Coccinelle for a
> selection of fairly complex semantic patches.

Would you like to share more information about test cases for this report?
Which scripts measured the shown data points?

Regards,
Markus