linux-kernel - Re: [tip:tracing/core] tracing/filters: Provide basic regex support

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Date:	Sat, 26 Sep 2009 06:10:05 -0400
From:	Steven Rostedt <rostedt@...dmis.org>
To:	linux-kernel@...r.kernel.org, mingo@...hat.com, hpa@...or.com,
	tzanussi@...il.com, lizf@...fujitsu.com, fweisbec@...il.com,
	tglx@...utronix.de
Cc:	linux-tip-commits@...r.kernel.org
Subject: Re: [tip:tracing/core] tracing/filters: Provide basic regex support

On Fri, 2009-09-25 at 06:19 +0000, tip-bot for Frederic Weisbecker
wrote:
> Commit-ID:  1889d20922d14a97b2099fa4d47587217c0ba48b
> Gitweb:     http://git.kernel.org/tip/1889d20922d14a97b2099fa4d47587217c0ba48b
> Author:     Frederic Weisbecker <fweisbec@...il.com>
> AuthorDate: Thu, 24 Sep 2009 21:10:44 +0200
> Committer:  Frederic Weisbecker <fweisbec@...il.com>
> CommitDate: Thu, 24 Sep 2009 21:39:27 +0200
> 
> tracing/filters: Provide basic regex support
> 
> This patch provides basic support for regular expressions in filters.
> 
> It supports the following types of regexp:
> 
> - *match_beginning
> - *match_middle*
> - match_end*
> - !don't match
> 
> Example:
> 	cd /debug/tracing/events/bkl/lock_kernel
> 	echo 'file == "*reiserfs*"' > filter
> 	echo 1 > enable

Darn! I need to keep up with my email more. Someone asked me at my
ftrace tutorial if the filters can take regex's.  I told them that I
don't think so. Of course, my tutorial was on 2.6.31 so I was still
correct. But it would have been nice if I told them that it will in
2.6.32 or 33.

-- Steve

> 
>            gedit-4941  [000]   457.735437: lock_kernel: depth: 0, fs/reiserfs/namei.c:334 reiserfs_lookup()
>      sync_supers-227   [001]   461.379985: lock_kernel: depth: 0, fs/reiserfs/super.c:69 reiserfs_sync_fs()
>      sync_supers-227   [000]   461.383096: lock_kernel: depth: 0, fs/reiserfs/journal.c:1069 flush_commit_list()
>       reiserfs/1-1369  [001]   461.479885: lock_kernel: depth: 0, fs/reiserfs/journal.c:3509 flush_async_commits()
> 
> Every string is now handled as a regexp in the filter framework, which
> helps to factorize the code for handling both simple strings and
> regexp comparisons.
> 
> (The regexp parsing code has been wildly cherry picked from ftrace.c
> written by Steve.)
> 
> v2: Simplify the whole and drop the filter_regex file


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