linux-kernel - Re: [PATCH 1/5] ftrace: Support full glob matching

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Message-ID: <20161019092057.203b7b12@gandalf.local.home>
Date:   Wed, 19 Oct 2016 09:20:57 -0400
From:   Steven Rostedt <rostedt@...dmis.org>
To:     Masami Hiramatsu <mhiramat@...nel.org>
Cc:     Shuah Khan <shuah@...nel.org>, linux-kernel@...r.kernel.org,
        Ingo Molnar <mingo@...hat.com>,
        Namhyung Kim <namhyung@...nel.org>,
        Tom Zanussi <tom.zanussi@...ux.intel.com>,
        linux-kselftest@...r.kernel.org
Subject: Re: [PATCH 1/5] ftrace: Support full glob matching

On Wed, 19 Oct 2016 13:53:36 +0900
Masami Hiramatsu <mhiramat@...nel.org> wrote:

> Use glob_match() to support flexible glob wildcards (*,?)
> and character classes ([) for ftrace.
> Since the full glob matching is slower than the current
> partial matching routines(*pat, pat*, *pat*), this leaves
> those routines and just add MATCH_GLOB for complex glob
> expression.
> 
> e.g.
> ----
> [root@...alhost tracing]# echo 'sched*group' > set_ftrace_filter
> [root@...alhost tracing]# cat set_ftrace_filter
> sched_free_group
> sched_change_group
> sched_create_group
> sched_online_group
> sched_destroy_group
> sched_offline_group
> [root@...alhost tracing]# echo '[Ss]y[Ss]_*' > set_ftrace_filter
> [root@...alhost tracing]# head set_ftrace_filter
> sys_arch_prctl
> sys_rt_sigreturn
> sys_ioperm
> SyS_iopl
> sys_modify_ldt
> SyS_mmap
> SyS_set_thread_area
> SyS_get_thread_area
> SyS_set_tid_address
> sys_fork
> ----

Hi Masami,

Is this any different than your last patch, as I already pulled it into
my queue. I haven't been able to test it much, as I found that 4.9-rc1
is failing my tests, and I can't add new code to linux-next till 4.9 is
stable.

-- Steve