linux-kernel - perf/ftrace: does PERF_EVENT_IOC_SET

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Date:	Tue, 9 Jun 2015 14:30:44 -0400 (EDT)
From:	Vince Weaver <vincent.weaver@...ne.edu>
To:	linux-kernel@...r.kernel.org
cc:	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Ingo Molnar <mingo@...hat.com>,
	Arnaldo Carvalho de Melo <acme@...nel.org>,
	Stephane Eranian <eranian@...il.com>,
	Jiri Olsa <jolsa@...hat.com>,
	Steven Rostedt <rostedt@...dmis.org>
Subject: perf/ftrace: does PERF_EVENT_IOC_SET_FILTER serve any purpose?

Hello

I've been working on documenting the PERF_EVENT_IOC_SET_FILTER ioctl.

I've been trying for the past 2 days and have been unable to get any 
result except EINVAL.

Does anyone ever use this ioctl?  Does anyone know how to use this ioctl?

I understand it takes a pointer to a string that contains an 
"ftrace_filter" but the ftrace documentation is very confusing and it's 
unclear exactly what, if any, string is appropriate here.  I've even 
resorted to sprinkling printk()s throughout the parser code and still 
can't figure out what's going on.

Vince 
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/