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From: Julia Lawall <julia.lawall@lip6.fr>
To: 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>
Subject: Re: [Cocci] [PATCH v2 4/8] scripts: add glimpse.sh for indexing the kernel
Date: Fri, 17 Jun 2016 18:11:53 +0200 (CEST)	[thread overview]
Message-ID: <alpine.DEB.2.10.1606171809150.3164@hadrien> (raw)
In-Reply-To: <477f1f1d-f60f-79b9-1f0f-f9cb030c240a@users.sourceforge.net>

> Under which circumstances will the indexing efforts pay off?

Indexing is beneficial when a semantic patch uses in an essential way some
words that appear rarely in the code base.  For example, the following
semantic patch will only do something useful on code that contains xyz:

- x = kmalloc();
  ..
- x = xyz();

There is no need to parse the code, match the thousands of occurrences of
kmalloc, nor to do the tracing of execution paths implied by ... if the
code does not contain any call to xyz anyway.

julia

WARNING: multiple messages have this Message-ID (diff)
From: julia.lawall@lip6.fr (Julia Lawall)
To: cocci@systeme.lip6.fr
Subject: [Cocci] [PATCH v2 4/8] scripts: add glimpse.sh for indexing the kernel
Date: Fri, 17 Jun 2016 18:11:53 +0200 (CEST)	[thread overview]
Message-ID: <alpine.DEB.2.10.1606171809150.3164@hadrien> (raw)
In-Reply-To: <477f1f1d-f60f-79b9-1f0f-f9cb030c240a@users.sourceforge.net>

> Under which circumstances will the indexing efforts pay off?

Indexing is beneficial when a semantic patch uses in an essential way some
words that appear rarely in the code base.  For example, the following
semantic patch will only do something useful on code that contains xyz:

- x = kmalloc();
  ..
- x = xyz();

There is no need to parse the code, match the thousands of occurrences of
kmalloc, nor to do the tracing of execution paths implied by ... if the
code does not contain any call to xyz anyway.

julia

  reply	other threads:[~2016-06-17 16:12 UTC|newest]

Thread overview: 44+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2016-06-16 22:31 [PATCH v2 0/8] coccicheck: modernize Luis R. Rodriguez
2016-06-16 22:31 ` [Cocci] " Luis R. Rodriguez
2016-06-16 22:31 ` [PATCH v2 1/8] coccicheck: move spatch binary check up Luis R. Rodriguez
2016-06-16 22:31   ` [Cocci] " Luis R. Rodriguez
2016-06-16 22:31 ` [PATCH v2 2/8] coccicheck: enable parmap support Luis R. Rodriguez
2016-06-16 22:31   ` [Cocci] " Luis R. Rodriguez
2016-06-16 22:31 ` [PATCH v2 3/8] coccicheck: add indexing enhancement options Luis R. Rodriguez
2016-06-16 22:31   ` [Cocci] " Luis R. Rodriguez
2016-06-17  9:47   ` Julia Lawall
2016-06-17  9:47     ` [Cocci] " Julia Lawall
2016-06-17 15:12     ` Luis R. Rodriguez
2016-06-17 15:12       ` [Cocci] " Luis R. Rodriguez
2016-06-17 15:29       ` Julia Lawall
2016-06-17 15:29         ` [Cocci] " Julia Lawall
2016-06-16 22:31 ` [PATCH v2 4/8] scripts: add glimpse.sh for indexing the kernel Luis R. Rodriguez
2016-06-16 22:31   ` [Cocci] " Luis R. Rodriguez
2016-06-17  9:44   ` Julia Lawall
2016-06-17  9:44     ` [Cocci] " Julia Lawall
2016-06-17 15:10     ` Luis R. Rodriguez
2016-06-17 15:10       ` [Cocci] " Luis R. Rodriguez
2016-06-17 15:35       ` Julia Lawall
2016-06-17 15:35         ` [Cocci] " Julia Lawall
2016-06-18  1:22         ` Luis R. Rodriguez
2016-06-18  1:22           ` [Cocci] " Luis R. Rodriguez
2016-06-18  5:51           ` Julia Lawall
2016-06-18  5:51             ` [Cocci] " Julia Lawall
2016-06-20 19:18             ` Luis R. Rodriguez
2016-06-20 19:18               ` [Cocci] " Luis R. Rodriguez
2016-06-18 10:37           ` Julia Lawall
2016-06-18 10:37             ` [Cocci] " Julia Lawall
2016-06-18 10:38             ` Julia Lawall
2016-06-18 10:38               ` [Cocci] " Julia Lawall
2016-06-17 15:18     ` SF Markus Elfring
2016-06-17 15:18       ` SF Markus Elfring
2016-06-17 16:11       ` Julia Lawall [this message]
2016-06-17 16:11         ` Julia Lawall
2016-06-16 22:31 ` [PATCH v2 5/8] coccicheck: replace --very-quiet with --quit when debugging Luis R. Rodriguez
2016-06-16 22:31   ` [Cocci] " Luis R. Rodriguez
2016-06-16 22:31 ` [PATCH v2 6/8] coccicheck: add support for requring a coccinelle version Luis R. Rodriguez
2016-06-16 22:31   ` [Cocci] " Luis R. Rodriguez
2016-06-16 22:31 ` [PATCH v2 7/8] coccicheck: refer to coccicheck bottest wiki for documentation Luis R. Rodriguez
2016-06-16 22:31   ` [Cocci] " Luis R. Rodriguez
2016-06-16 22:31 ` [PATCH v2 8/8] scripts/coccinelle: require coccinelle >= 1.0.4 on device_node_continue.cocci Luis R. Rodriguez
2016-06-16 22:31   ` [Cocci] " Luis R. Rodriguez

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