linux-kernel - Re: perf: multiplexing broken on amd fam16h?

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

Message-ID: <20150722150035.GU25159@twins.programming.kicks-ass.net>
Date:	Wed, 22 Jul 2015 17:00:35 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Vince Weaver <vincent.weaver@...ne.edu>
Cc:	linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...hat.com>,
	Arnaldo Carvalho de Melo <acme@...nel.org>
Subject: Re: perf: multiplexing broken on amd fam16h?

On Wed, Jul 22, 2015 at 10:57:23AM -0400, Vince Weaver wrote:
> On Wed, 22 Jul 2015, Peter Zijlstra wrote:

> > Can you run with something like the below?
> 
> OK, so I have to admit I'm a bit weak on ftrace.  What type of command 
> line are you interested in seeing?  The ones I've tried with trace-cmd
> have  activated  your trace_printks but there's 500MB of other data mixed 
> in so maybe I am doing something wrong.

something along the lines of:

echo function > /debug/tracing/current_tracer
echo nop > /debug/tracing/current_tracer
echo 0 > /debug/tracing/trace

./check_multiplexing

echo 0 > /debug/tracing/tracing_on
cat /debug/tracing/trace > ~/trace.log

I've no idea how trace-cmd works, I don't even think I have it :-)
--
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/